Re: serialize a class to XML and back
On 26-5-2013 22:48, Roy Smith wrote: > The advantage of pickle over json is that pickle can serialize many > types of objects that json can't. The other side of the coin is that > pickle is python-specific, so if you think you'll ever need to read your > data from other languages, pickle is right out. That is not entirely true :) I've written a pickle implementation for Java and .NET that is almost feature complete; it is part of http://pythonhosted.org/Pyro4/pyrolite.html Still, pickle may not be the best choice here. Cheers Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: serialize a class to XML and back
On 27-5-2013 2:39, Roy Smith wrote: > In article <51a28f42$0$15870$e4fe5...@news.xs4all.nl>, > Irmen de Jong wrote: > >> On 26-5-2013 22:48, Roy Smith wrote: >> >>> The advantage of pickle over json is that pickle can serialize many >>> types of objects that json can't. The other side of the coin is that >>> pickle is python-specific, so if you think you'll ever need to read your >>> data from other languages, pickle is right out. >> >> That is not entirely true :) I've written a pickle implementation for Java >> and .NET >> that is almost feature complete; it is part of >> http://pythonhosted.org/Pyro4/pyrolite.html > > Very cool > >> Still, pickle may not be the best choice here. > > Perhaps not, but lots of points for the awesomeness factor. > Thanks for the praise :) There's another interesting thing perhaps to also mention about Pyrolite. Its Pickle implementation obviously maps built in types to their counterparts in Java/.NET, but it is also capable of unpickling custom classes. It defaults to outputting a simple hashtable with the class's properties in it, but you can also provide a custom deserializer to recreate a custom object (it already does this automatically for a few complex types such as DateTime, BigDecimal, and a bunch of Pyro specific types). As the unpicklers are not executing any Java or .NET code dynamically they are not susceptible to the security issue that Python's pickle has. Still: tread with care. (Especially if you use the lib to pickle stuff and unpickle it on the Python side). Also, the one missing feature is memo-ing when pickling so that you can pickle recursive object graphs. It now throws a stack overflow exception instead. Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: Pillow lib for x86_64 GNU/Linux
On 3-6-2013 18:23, consult...@gmail.com wrote: > It is great that Pillow wants to be "setuptools compatible" but without a > suitable compiled library for x86_64 GNU/Linux, I am stuck between a rock and > a hard place. > > Any suggestions? > Try your distribution's package repository. $ sudo apt-get install python-pillow Or failing that, $ sudo apt-get install python-imaging Worked fine for me (Ubuntu 64-bit) Irmen -- http://mail.python.org/mailman/listinfo/python-list
problem uploading docs to pypi
Hi, I'm experiencing some trouble when trying to upload the documentation for one of my projects on Pypi. I'm getting a Bad Gateway http error message. Anyone else experiencing this? Is this an intermittent issue or is there a problem with Pypi? Downloading documentation (from pythonhosted.org) works fine. Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: problem uploading docs to pypi
On 15-6-2013 2:23, MRAB wrote: > About 10 ten days ago I got the error: > > Upload failed (503): backend write error > > while trying to upload to PyPI, and it failed the same way the second time, > but worked some > time later. You're right. I tried it again just now and it succeeded this time. Cheers Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: Using Python to automatically boot my computer at a specific time and play a podcast
On 17-6-2013 15:24, inq1ltd wrote:
> On Sunday, June 16, 2013 12:06:08 PM C. N. Desrosiers wrote:
>
>> Hi,
>
>>
>
>> I'm planning to buy a Macbook Air and I want to use it as a sort of alarm.
>> I'd like to write a program that boots my computer at a specific time,
>> loads iTunes, and starts playing a podcast. Is this sort of thing possible
>> in Python?
You can use the osascript utility to send commands to itunes, and invoke it
from Python
like this:
import subprocess
listname = "My Playlist"
subprocess.call(["osascript", "-e", "tell application \"iTunes\" to play
playlist
\"{0}\"".format(listname)])
But that seems overkill (using Python to use Applescript to control iTunes)...
Irmen
--
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Re: Looking for a name for a deployment framework...
On 24-6-2013 20:13, Cousin Stanley wrote: > jonathan.slend...@gmail.com wrote: > >> Any suggestions for a good name, >> for a framework that does >> automatic server deployments ? > > asdf : automatic server deployment framework > > :-) wsad: wonderful serverside automatic deployments (hm, could use a bit of tweaking, maybe FPS keys don't map easily to names) Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: class factory question
On 27-6-2013 15:48, Dave Angel wrote: >> The behavior for these is all the same so they're subclassed >> from one base class, but they need to have these particular names so the >> parser knows >> how to consume them when encountered in the source file. That is, for every >> custom >> command the parser encounters, it looks for a class of that name in order to >> tokenize it. ^ How does it look for a class? Can you perhaps override the way it looks for a class of that name? So that you can instead return something sensible rather than having to define one of 50 almost identical classes... Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: math functions with non numeric args
On 30-6-2013 20:46, Andrew Z wrote:
> Hello,
>
> print max(-10, 10)
> 10
> print max('-10', 10)
> -10
>
> My guess max converts string to number bye decoding each of the characters to
> it's ASCII
> equivalent?
>
> Where can i read more on exactly how the situations like these are dealt with?
>
> Thank you
> AZ
>
Use Python 3.x instead.
>>> max('-10',10)
Traceback (most recent call last):
File "", line 1, in
TypeError: unorderable types: int() > str()
>>>
Irmen
--
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Re: socket data sending problem
On 4-7-2013 0:38, ollietemple...@aol.com wrote:
> it all works fine, except for when i try to use:
>
> s.send("hello")
>
> to send data between the client and server, i just get this error message:
>
> >>>
> Traceback (most recent call last):
> File "C:/Users/Ollie/Documents/code/chatroom/client3.py", line 9, in
>
> s.send("hello")
> TypeError: 'str' does not support the buffer interface
> >>>
Are you using Python 3.x? Try sending bytes instead of strings:
s.send(b"hello")
Or switch to using Python 2.7
Irmen
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Re: How to check for threads being finished?
On 5-7-2013 18:59, Steven D'Aprano wrote: > I then block until the threads are all done: > > while any(t.isAlive() for t in threads): > pass > > > Is that the right way to wait for the threads to be done? Should I stick > a call to time.sleep() inside the while loop? If so, how long should I > sleep? That's probably an unanswerable question, but some guidelines on > choosing the sleep time will be appreciated. > I think your while loop busy-waits until the threads are completed. Do this instead: for t in threads: t.join()# optionally pass a timeout to join -Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: Python - remote object protocols and security
On 15-7-2013 13:17, Dave Angel wrote: > On 07/15/2013 06:20 AM, Jean-Michel Pichavant wrote: >> In text format... sorry for my previous html post >> >> Hello everyone, >> >> I'd like to exchange some simple python objects over the internet. >> I initially planned to use Pyro, after reading >> http://pythonhosted.org/Pyro4/security.html I'm still puzzled. Hi, Pyro's author here. I agree that this chapter of the manual can use some cleanup. Is there anything in particular that you are puzzled about at this time? >> >> I don't mind encrypting data, if someone wants to sniff what I'm sending, >> he's welcome. >> I don't quite understand what you're saying in this sentence: is it okay if someone eavesdrops on your unencrypted data stream? >> What I think I need to care about, is malicious code injections. Because both >> client/server will be in python, would someone capable of executing code by >> changing >> one side python source ? Pyro since version 4.20 uses a serialization format that is safe against arbitrary code execution: https://pypi.python.org/pypi/serpent That format only encodes and decodes Python literal expressions, and no arbitrary objects are instantiated. You can also tell Pyro to use JSON (or marshal even), both of which should be impervious to this type of attack/vulnerability as well. The problem is with older Pyro versions, which allowed only Pickle to be used as serialization format. It is pickle that causes the remote code execution vulnerability. So as long as you don't explicitly tell Pyro (4.20+) to use pickle (a configuration switch), you should be safe. > I can't tell you if pyro, or any other particular one is safe. Pyro should be, since version 4.20 and provided you don't tell it to use pickle. See above. > Note that DOS attacks are possible whatever encoding scheme you have. Make > sure that > self-references within the data are well-defined (or impossible), and put > limits on size > per transaction, and transactions per minute per legitimate user. Pyro doesn't provide anything by itself to protect against this. Cheers Irmen de Jong -- http://mail.python.org/mailman/listinfo/python-list
Re: Python - remote object protocols and security
On 15-7-2013 18:57, Irmen de Jong wrote: >> Note that DOS attacks are possible whatever encoding scheme you have. Make >> sure that >> self-references within the data are well-defined (or impossible), and put >> limits on size >> per transaction, and transactions per minute per legitimate user. > > Pyro doesn't provide anything by itself to protect against this. I'm sorry to follow up on myself, but there is actually one thing: Pyro's choice of serializers (except pickle, again) don't allow self-references. So that type of DOS attack (infinite recursion) is ruled out. Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: Is it that easy to install Python ?
On 25-7-2013 17:11, santiago.d...@caoba.fr wrote: > Hi there, > > I never write any Python program but as a system administrator, I'm often > asked to install python on Debian servers. > > I just finished downloading, configuring, making and installing. > > The binary is now installed in : > /usr/local/Python-2.7.5/bin/python2.7 > (the path is a deliberate administrator choice). > > Is that it? > > What else will my users need? Why didn't you use the Debian package instead? You now have installed an unsupported, untested custom built Python version on your server. Why not simply $ apt-get install python and let the Debian package maintainers take care of properly testing and supporting it... Also, installing additional python packages will be much less of a hassle because there's hundreds of them readily available in Debian's package repositories and they can be installed (including correct dependencies) in the same way. Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: Thread is somehow interfering with a while loop called after the thread is started
On 28-7-2013 4:29, dan.h.mciner...@gmail.com wrote: > I have a simple scapy + nfqueue dns spoofing script that I want to turn into > a thread within a larger program: > > http://www.bpaste.net/show/HrlfvmUBDA3rjPQdLmdp/ > > Below is my attempt to thread the program above. Somehow, the only way the > while loop actually prints "running" is if the callback function is called > consistently. If the callback function isn't started, the script will never > print "running". How can that be if the while loop is AFTER the thread was > started? Shouldn't the while loop and the thread operate independantly? > > http://bpaste.net/show/0aCxSsSW7yHcQ7EBLctI/ > Try adding sys.stdout.flush() after your print statements, I think you're seeing a stdout buffering issue. Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: setup.py Choosing Older Compiler On Windows
On 2-12-2012 22:06, Dave Angel wrote: > On 12/02/2012 09:34 AM, Ami Tavory wrote: >> Hello, >> >> I'm porting a C++ extension module to a Windows machine that has both VC8 >> and VC10 installed. Unfortunately, `setup.py build` tries to build using >> VC8, which fails (the extension uses C++ standard libraries that VC didn't >> used to have). Is there a way to get setup.py to use VC10 (preferably >> externally, without modifying the script)? >> >> > > I haven't had to do Windows C++ development for many years, but there > used to be a vcvars.bat in each compiler installation, and you run the > one corresponding to the compiler & libraries you want. Forcing it to use a different compiler than the one that was used to build Python itself, may very well lead to a non-working extension module. Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: Installing packages on Mac OS X 10.7.5
On 6-12-2012 0:12, John Dildy wrote: > Hello Everyone! > > I have python v2.7.1 and I am trying to install packages on the Mac OS X > v10.7.5 > > I am trying to install: > > Distribute > > Nose > > virtualenv > > If anyone can help me that would be great > > John Dildy > > jdild...@gmail.com > Avoid changing stuff on the system installed python. If you don't have virtualenv already, I would suggest to either: - install virtualenv by means of easy_install (which should be installed already) - do everything else in a virtual env, instead of in the system installed python directly Or install homebrew, then brew install python, and use that. This avoids using the system installed python entirely. Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: How to list a file which already created a 2 mins ago
On 6-12-2012 17:49, moonhkt wrote: > Hi All > > AIX.5.3 > Python 2.6.2 > > File ftp to Machine A, need to rename then send to Machine B. > > How to list a file which already created a 2 mins ago ? If file aging > more than 2 mins. I want to rename file to other file name. > > moonhkt > ftplib.FTP os.path.getmtime os.rename time.time Should be some pointers to get started. Irmen -- http://mail.python.org/mailman/listinfo/python-list
wrong ImportError message printed by python3.3 when it can't find a module?
Hi, I'm seeing that Python 3.3.0 is not printing the correct ImportError when it can't import a module that is imported from another module. Instead of printing the name of the module it can't import, it prints the name of the module that is doing the faulty import. Behold: I have created: importfail\ __init__.py main.py sub.py [L:\]type importfail\main.py from . import sub [L:\]type importfail\sub.py import nonexisting_module [L:\] [L:\]c:\Python33\python.exe -m importfail.main Traceback (most recent call last): File "C:\Python33\lib\runpy.py", line 160, in _run_module_as_main "__main__", fname, loader, pkg_name) File "C:\Python33\lib\runpy.py", line 73, in _run_code exec(code, run_globals) File ".\importfail\main.py", line 1, in from . import sub ImportError: cannot import name sub# <--- huh ? Python 3.2 and earlier do the right thing: [L:\]c:\Python32\python.exe -m importfail.main Traceback (most recent call last): File "C:\Python32\lib\runpy.py", line 160, in _run_module_as_main "__main__", fname, loader, pkg_name) File "C:\Python32\lib\runpy.py", line 73, in _run_code exec(code, run_globals) File "L:\importfail\main.py", line 1, in from . import sub File "importfail\sub.py", line 1, in import nonexisting_module ImportError: No module named nonexisting_module# <--- ok. (this is on windows, but on osx I see the same behavior). Is there a problem with the rewritten import logic in Python 3.3? Thanks Irmen de Jong -- http://mail.python.org/mailman/listinfo/python-list
Re: wrong ImportError message printed by python3.3 when it can't find a module?
On 7-12-2012 22:20, Peter Otten wrote: > A paragon of clarity -- ye lurkers, this is how a bug report should be. :-) > >> Is there a problem with the rewritten import logic in Python 3.3? >> >> Thanks >> Irmen de Jong > > I believe this is fixed, see http://bugs.python.org/issue15111 Argh, why didn't I search the bug tracker first: I would have found that one for sure. Anyway, thanks for pointing it out. The bug is confusing but it doesn't break anything so far. I guess I'll be fine waiting for 3.3.1. Irmen -- http://mail.python.org/mailman/listinfo/python-list
need some help with unexpected signal exception when using input from a thread (Pypy 1.9.0 on osx/linux)
Hi. Using Pypy 1.9.0. Importing readline. Using a background thread to get input() from stdin. It then crashes with: File "/usr/local/Cellar/pypy/1.9/lib_pypy/pyrepl/unix_console.py", line 400, in restore signal.signal(signal.SIGWINCH, self.old_sigwinch) ValueError: signal() must be called from the main thread Anyone seen this before? What's going on? When I don't import readline, or do the input() from within the main thread, the problem disappears. (I tried to reproduce it in a small test scenario but unfortunately have not been able to do so yet. Haven't figured out yet what the additional factors are that trigger this problem. A simple import readline and input() from a new thread doesn't seem to trigger it, unfortunately) Regards Irmen de Jong -- http://mail.python.org/mailman/listinfo/python-list
Re: Command Line Progress Bar
On 26-12-2012 7:17, Kevin Anthony wrote: > Hello, > I'm writing a file processing script(Linux), and i would like to have a > progress bar. > But i would also like to be able to print messages. Is there a simple way > of doing > this without implementing something like ncurses? This little library can prove useful: http://pypi.python.org/pypi/fish/ -Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: Inserting Unicode chars in Entry widget
On 29-12-2012 17:43, Alan Graham wrote: > Hello Python experts, > > I want to insert Unicode chars in an Entry widget by pushing on buttons; > one for each Unicode character I need. I have made the Unicode buttons. > I just need a simple function that will send the Unicode character to > the Entry widget. > Is there a better approach? > > Alan > Not sure what the question is. A better approach to doing what? I assuming you're doing tkinter (it is helpful if you mention the toolkit when posting a question). I'd create a function that you bind to all 'unicode buttons', and let the function insert the correct character depending on which button triggered it. A possible way to do that is to use a lambda with a different parameter for every button, like this: b1=Button(f, text='char1', command=lambda b=1: insert_char(b)) b2=Button(f, text='char2', command=lambda b=2: insert_char(b)) ...etc.. def insert_char(b): if b==1: entrywidget.insert(0, u"\u20ac") # inserts € in the entry widget e elif b==2: entrywidget.insert(0, ...some other char...) ... Or simply define a different command function for every button, then you don't have to use the lambda. -irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: Inserting Unicode chars in Entry widget
On 29-12-2012 18:23, Chris Angelico wrote:
> On Sun, Dec 30, 2012 at 4:11 AM, Irmen de Jong wrote:
>> b1=Button(f, text='char1', command=lambda b=1: insert_char(b))
>> b2=Button(f, text='char2', command=lambda b=2: insert_char(b))
>> ...etc..
>>
>> def insert_char(b):
>> if b==1:
>> entrywidget.insert(0, u"\u20ac") # inserts € in the entry widget e
>> elif b==2:
>> entrywidget.insert(0, ...some other char...)
>> ...
>
> I'm not familiar with tkinter syntax, but why not:
>
> b1=Button(f, text='char1', command=lambda: insert_char(1))
> b2=Button(f, text='char2', command=lambda: insert_char(2))
>
> or even:
>
> b1=Button(f, text='char1', command=lambda: insert_char(u"\u20ac"))
> b2=Button(f, text='char2', command=lambda: insert_char("... some other
> char..."))
>
> Seems weird to multiplex like that, but if there's a good reason for
> it, sure. I'm more of a GTK person than tkinter, and more of a
> command-line guy than either of the above.
>
> ChrisA
>
You're right there's nothing special about tkinter there, I was copying some
existing
code a bit too literally. Simplify the lambdas as needed. :)
Irmen
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Re: Beginner: Trying to get REAL NUMBERS from %d command
On 30-12-2012 23:37, Alvaro Lacerda wrote: > > I'm trying to get full number result using the %d command Try %f instead. %d is the formatting symbol for integer numbers. See http://docs.python.org/2/library/stdtypes.html#string-formatting-operations Or have a look at what string.format() can do: http://docs.python.org/2/library/string.html#format-examples -irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: test failed: test_urlwithfrag
On 7-1-2013 19:26, Elli Lola wrote: > I never used python before and installed it today the first time, so I have > no idea what > to do about this failure: > > > $ ./python -m test -v test_urlwithfrag [..snip..] > ImportError: No module named 'test.test_urlwithfrag' > > 1 test failed: > test_urlwithfrag The error message says it all, really: there is no regression test module called "test_urlwithfrag". (At least, not on my python 3.3 installation) Check the contents of your /Lib/test directory to see what is available instead. Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: Thorough Python 2.7.3 Windows Build Documentation?
On 21-1-2013 18:16, Stephane Wirtel wrote: > Hi Leonard, > > Please, could you limit your text to 80 columns, because it's > unreadable. Your text is too long :( Stephane, shouldn't your news reader simply wrap the lines...? At least mine does. (Thunderbird) Irmen -- http://mail.python.org/mailman/listinfo/python-list
serpent, a serializer based around ast.literal_eval
Hi, I've been toying a bit with ast.literal_eval. I've come up with "serpent", a serializer based around that. Which means that it takes a Python object tree and turns it into a serialized form that can be safely read back by ast.literal_eval(). Why I wrote serpent and didn't simply use repr()+ast.literal_eval: * it serializes directly to bytes (utf-8 encoded), instead of a string, so it can immediately be saved to a file or sent over a socket * it encodes byte-types as base-64 instead of inefficient escaping notation that repr would use (this does mean you have to base-64 decode these strings manually on the receiving side to get your bytes back) * it contains a few custom serializers for several additional Python types such as uuid, datetime, array and decimal * it tries to serialize unrecognised types as a dict (you can control this with __getstate__ on your own types) * it can create a pretty-printed (indented) output for readability purposes * it works around a few quirks of ast.literal_eval() on the various Python implementations. It works with Python 2.6+ (including 3.x), IronPython 2.7+, Jython 2.7+. Serpent can be downloaded from Pypi: http://pypi.python.org/pypi/serpent A simple example session can be seen here: https://gist.github.com/4588429 I'm considering writing Java and .NET counterparts for this as well so I'll be able to exchange messages between the three. What do you think? Would you consider this useful at all? Cheers Irmen de Jong -- http://mail.python.org/mailman/listinfo/python-list
Re: Finding MIME type for a data stream
On 8-3-2012 23:34, Tobiah wrote: > Also, I realize that I could write the data to a file > and then use one of the modules that want a file path. > I would prefer not to do that. > > Thanks > Use StringIO then, instead of a file on disk Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: Raise X or Raise X()?
On 11-3-2012 20:04, bvdp wrote: > Which is preferred in a raise: X or X()? I've seen both. In my specific case > I'm dumping out of a deep loop: > > try: > for ... > for ... > for ... > if match: >raise StopInteration() > else ... > > except StopInteration: >print "found it" "raise X" is a special case of the 3-args raise. Effectively it just raises an instance of X which is constructed with an empty argument list. Therefore, "raise X()" is equivalent, as far as I know. See http://docs.python.org/reference/simple_stmts.html#the-raise-statement Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: Will MySQL ever be supported for Python 3.x?
On 30-3-2012 23:20, John Nagle wrote: > The MySQLdb entry on SourceForge > (http://sourceforge.net/projects/mysql-python/) > web site still says the last supported version of Python is 2.6. > PyPi says the last supported version is Python 2.5. The > last download is from 2007. > > I realize there are unsupported fourth-party versions from other > sources. (http://www.lfd.uci.edu/~gohlke/pythonlibs/) But those > are just blind builds; they haven't been debugged. > > MySQL Connector (http://forge.mysql.com/projects/project.php?id=302) > is still pre-alpha. Try Oursql instead http://packages.python.org/oursql/ "oursql is a new set of MySQL bindings for python 2.4+, including python 3.x" Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: Will MySQL ever be supported for Python 3.x?
On 30-3-2012 23:46, John Nagle wrote: > On 3/30/2012 2:32 PM, Irmen de Jong wrote: >> Try Oursql instead http://packages.python.org/oursql/ >> "oursql is a new set of MySQL bindings for python 2.4+, including python 3.x" > >Not even close to being compatible with existing code. Every SQL > statement has to be rewritten, with the parameters expressed > differently. It's a good approach, but very incompatible. You didn't state that it had to be compatible with existing code. Also, since you asked about Python 3.x, surely there are other incompatibilities you need to take care of in the existing code? (unless it's Python 3.x clean already...) Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: Installing Python 2.5.2 on Win 7
On 1-4-2012 22:11, W. eWatson wrote: > To solve this problem I thought I would install the software on my laptop > Win7 PC. When > I tried PIL.1.1.6 I got several unexpected messages that seem to indicate > things were > not going well. I have stopped to find out if it is really possible to > install this > suite of software on Win7. Is it possible? If not, will uninstalling Python > also remove > PIL? I'm using PIL 1.1.7 (the latest version available from effbot's website) on Windows 7. Admittedly, with Python 2.7.2, but there's an installer for Python 2.5 as well. I assume it should work just fine. What errors were you seeing? And no, uninstall Python won't remove PIL - it has its own uninstaller. Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: ast.parse
On 9-4-2012 13:53, Kiuhnm wrote: > Is it a known fact that ast.parse doesn't handle line continuations and some > multi-line > expressions? > For instance, he doesn't like > for (x, > y) in each([1, > 2]): > print(1) > at all. > Is there a workaround besides "repairing" the code on the fly? > > Kiuhnm What Python version are you using and what is the exact error? It works fine here (Python 2.7.2): >>> import ast >>> code="""for (x, ... y) in each([1, ... 2]): ... print(1)""" >>> ast.parse(code) <_ast.Module object at 0x02418A10> Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: Suggest design to accomodate non-unix platforms ?
On 18-4-2012 15:35, Richard Shea wrote: > ... which I think would work and be sufficiently flexible to deal with > alternatives to putty.exe but is there a more established (... > better !) way of doing this stuff ? Perhaps install Cygwin and use its ssh.exe? Or use the paramiko library? (which, I believe, implements SSH directly) Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: Create directories and modify files with Python
On 1-5-2012 1:24, deltaquat...@gmail.com wrote: > Hi, 0 I would like to automate some simple tasks I'm doing by hand. Given a > text file > foobar.fo: [...] > At first, I tried to write a bash script to do this. However, when and if the > script > will work, I'll probably want to add more features to automate some other > tasks. So I > thought about using some other language, to have a more flexible and > mantainable > code. I've been told that both Python and perl are well suited for such > tasks, but > unfortunately I know neither of them. Can you show me how to write the script > in > Python? Thanks, Err.. if you don't know Python, why do you think a Python script will be more flexible and maintainable for you? But if you really want to go this way (and hey, why not) then first you'll have to learn some basic Python. A good resource for this might be: http://learnpythonthehardway.org/ Focus on file input and output, string manipulation, and look in the os module for stuff to help scanning directories (such as os.walk). Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: Create directories and modify files with Python
On 1-5-2012 12:51, deltaquat...@gmail.com wrote: But if you really want to go this way (and hey, why not) then first you'll have to learn some basic Python. A good resource for this might be: http://learnpythonthehardway.org/ Ehm...name's not exactly inspiring for a newbie who's short on time :) It's just a name. That resource is generally regarded as one of the better books to learn Python for total beginners. If you can program already in another language, the standard Python tutorial might be more efficient to start from: http://docs.python.org/tutorial/ Thanks for the directions. By the way, can you see my post in Google Groups? I'm not able to, and I don't know why. I don't use Google groups. I much prefer a proper news agent to read my usenet newsgroups. Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: .py to .pyc
On 13-5-2012 23:27, Colin J. Williams wrote: > Is there some way to ensure that a .pyc file is produced when executing a .py > file? > > It seems that for small files the .pyc file is not produced. > > Colin W. All modules no matter how small produce a .pyc file *when they are imported*. If you start a module directly though, no .pyc is produced. (Notice that Python 3 puts the pyc files in a subdirectory.) Why do you care anyway? Pyc files are an implementation detail. Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: installing 2 and 3 alongside on MS Windows
On 25-5-2012 10:24, Ulrich Eckhardt wrote: > Hi! > What I'm considering is installing Python 3 alongside, in order to > prepare the code for this newer version. What I'd like to know first is > whether there are any problems I'm likely to encounter and possible > workarounds. What I'm doing myself on Windows is deciding which version of Python I want to be the default, and install that from the msi normally (including "register extensions" options). I then proceed to add its install location to my %PATH%. After which I install additional Python versions but *without* selecting "register extensions" otherwise they will overwrite the registry associations. I have about 5 different versions coexisting peacefully in c:\python26 c:\python27 c:\python27-64, c:\python32 and c:\python33 (with python27 being the default and only c:\python27 added to %PATH%) In the IDE I'm using (PyCharm) you can trivially switch the Python version it will use for your project. > Thank you! > > Uli > > PS: Dear lazyweb, is there any way to teach VC8 some syntax highlighting > for Python? http://pytools.codeplex.com/ perhaps? Irmen. -- http://mail.python.org/mailman/listinfo/python-list
Re: Install lxml package on Windows 7
On 29-5-2012 22:41, David Fanning wrote: > Folks, > > I need some help. I need the lxml package to run a particular > Python program. > >http://lxml.de/ > > I downloaded the appropriate binary egg package for lxml, and > I found easy_install.exe in my Python 2.7 distribution. I ran > that. > > Then, at the command prompt I typed this: > >easy_install --allow-hosts=lxml.de,*.python.org lxml==2.3.4 [..snip..] Save yourself the pain trying to get it to build from source. Instead, just install a precompiled binary, for instance the one available from: http://www.lfd.uci.edu/~gohlke/pythonlibs/#lxml -Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: ./configure
On 4-6-2012 0:01, Janet Heath wrote: > > Thanks Alain. I should have a compiler on my Mac OS X Lion. I am thinking > that it > isn't set in my $PATH variable. I don't know where the $PATH is set at. I > will > check to see if their is a binary. You'll have to have the Apple Developer tools (xcode) installed to get a c-compiler, but maybe that's the case on your mac already. (Weird though, it should add gcc -the compiler- to the PATH by itself, I don't recall having to change that myself.) In any case, there is a .dmg with a binary installer for Python 2.7.3 available for download at python.org [1] so there should not really be a need to compile it yourself. If you really do need to compile it yourself, consider using Homebrew [2] to install it, instead of downloading the source and compiling it manually. With homebrew it's a simple 'brew install python' and a few minutes later it's done. It will be lot easier to install 3rd party library dependencies this way too. Irmen. [1] http://python.org/download/releases/2.7.3/ [2] http://mxcl.github.com/homebrew/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Function call arguments in stack trace?
On 7-6-2011 21:31, Dun Peal wrote: > On Jun 7, 1:23 pm, Neil Cerutti wrote: >> Use pdb. > > Neil, thanks for the tip; `pdb` is indeed a great debugging tool. > > Still, it doesn't obviate the need for arguments in the stack trace. If you can't use pdb perhaps you can use the following: Pyro has always had a feature that prints detailed stacktraces. It is mainly meant to clarify stacktraces that occur on a different machine (where you don't have the option of using pdb), but can very well be used for normal code too: import sys import Pyro4.util Pyro4.config.DETAILED_TRACEBACK=True sys.excepthook=Pyro4.util.excepthook def divide(a,b): return a//b def dividebysomething(a): return divide(a,0) print dividebysomething(10) When you run this, this will be printed: [E:\projects]python trace.py -- <> RAISED : integer division or modulo by zero Extended stacktrace follows (most recent call last) -- File "trace.py", line (13), in Source code: print dividebysomething(10) File "trace.py", line (11), in dividebysomething Source code: return divide(a,0) Local values: a = 10 -- File "trace.py", line (8), in divide Source code: return a//b Local values: a = 10 b = 0 -- <> RAISED : integer division or modulo by zero -- You can find the relevant code that produces these kinds of tracebacks in the util.py source file of Pyro. You can get that from Pypi: http://pypi.python.org/pypi/Pyro4/ or the file directly from subversion: $ svn export svn://svn.razorvine.net/Pyro/Pyro4/trunk/src/Pyro4/util.py Perhaps you can use this or adapt it to suit your needs. Irmen de Jong -- http://mail.python.org/mailman/listinfo/python-list
Re: To install lxml (and easy_install) for Python 3 under Windows...
On 12-6-2011 18:38, ncdave4l...@mailinator.com wrote: > I had difficulty installing lxml for Python 3.1 under Windows, and > took some notes as I worked through it. Here's how I finally managed > it... > > [...] In cases like this, Christoph Gohlke's page with 'Unofficial Windows Binaries for Python Extension Packages' can be very handy: http://www.lfd.uci.edu/~gohlke/pythonlibs/#lxml -irmen -- http://mail.python.org/mailman/listinfo/python-list
Infinite recursion in __reduce__ when calling original base class reduce, why?
Hi,
I'm having a rather obscure problem with my custom __reduce__ function. I can't
use
__getstate__ to customize the pickling of my class because I want to change the
actual
type that is put into the pickle stream. So I started experimenting with
__reduce__, but
am running into some trouble.
I've pasted my test code below. It works fine if 'substitute' is True, but as
soon as it
is set to False, it is supposed to call the original __reduce__ method of the
base
class. However, that seems to crash because of infinite recursion on Jython and
IronPython and I don't know why. It works fine in CPython and Pypy.
I wonder if my understanding of __reduce__ is wrong, or that I've hit a bug in
IronPython and Jython? Do I need to do something with __reduce_ex__ as well?
Any help is very much appreciated.
Irmen de Jong
# ironpython / jython __reduce__ recursion problem test program
import pickle
class Substitute(object):
def __init__(self, name):
self.name=name
def getname(self):
return self.name
class TestClass(object):
def __init__(self, name):
self.name=name
self.substitute=True
def getname(self):
return self.name
def __reduce__(self):
if self.substitute:
return Substitute, ("SUBSTITUTED:"+self.name,)
else:
# call the original __reduce__ from the base class
return super(TestClass, self).__reduce__() # crashes on
ironpython/jython
obj=TestClass("janet")
s=pickle.dumps(obj)
d=pickle.loads(s)
print(d)
print(d.getname())
# now disable the substitution and try again
obj.substitute=False
s=pickle.dumps(obj)
d=pickle.loads(s)
print(d)
print(d.getname())
--
http://mail.python.org/mailman/listinfo/python-list
Re: Infinite recursion in __reduce__ when calling original base class reduce, why?
On 14-6-2011 2:40, Chris Torek wrote: > > Nonetheless, there is something at least slightly suspicious here: [... snip explanations...] Many thanks Chris, for the extensive reply. There's some useful knowledge in it. My idea to call the base class reduce as the default fallback causes the problems: return return super(TestClass, self).__reduce__() If, following your suggestion, I replace that with: return self.__class__, (self.name,) it works fine. By the way, in the meantime I've played around with copyreg.pickle, and that code worked in all Python implementations I've tried it in. This code feels better too, because it is possible to simply use return self.__reduce__() as a fallback in it, because we're not touching the object's own __reduce__ in any way. Anyway thanks again Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: debugging https connections with urllib2?
On 18-6-2011 20:57, Roy Smith wrote: > We've got a REST call that we're making to a service provider over https > using urllib2.urlopen(). Is there any way to see exactly what's getting > sent and received over the network (i.e. all the HTTP headers) in plain > text? Things like tcpdump and strace only have access to the encrypted > data. > > We can't just switch to using http because the endpoint we're talking to > (and don't have control over) refuses plain-text connections. Put a proxy between the https-service endpoint and your client app. Let the proxy talk https and let your client talk http to the proxy. Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: How can I speed up a script that iterates over a large range (600 billion)?
On 21-06-11 21:48, John Salerno wrote: I'm working on the Project Euler exercises and I'm stumped on problem 3: "What is the largest prime factor of the number 600851475143 ?" Now, I've actually written functions to get a list of the factors of any given number, and then another function to get the prime numbers from that list. It works fine with small numbers, but when I try to feed my get_factors function with the above number (600 billion), naturally it takes forever! You need a better algorithm to calculate primes, and iterate over primes instead of over the full (half, or even better, sqrt(n)) range of possible values. You also should optimize the stop condition, once you find that the number can no longer be divided by larger primes you can stop the loop. For instance to get the prime factors of the number 1000 you'd iterate over the prime numbers 2,3,5 and conclude that 1000=2*2*2*5*5*5, so 5 would be the largest prime factor. No need to try larger primes than 5, let alone go through 1..sqrt(1000). The Sieve of Eratosthenes is a well known algorithm to calculate primes with reasonable efficiency. Irmen -- http://mail.python.org/mailman/listinfo/python-list
sorry, possibly too much info. was: Re: How can I speed up a script that iterates over a large range (600 billion)?
On 21-06-11 22:10, Irmen de Jong wrote: [stuff] I didn't read the last paragraph of John's message until just now, and now realize that what I wrote is likely way too much information for what he asked. I'm sorry. Next time I'll read everything until and including the last full stop. Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: sorry, possibly too much info. was: Re: How can I speed up a script that iterates over a large range (600 billion)?
On 21-6-2011 23:09, John Salerno wrote: > On Jun 21, 3:22 pm, Irmen de Jong wrote: >> On 21-06-11 22:10, Irmen de Jong wrote: >> [stuff] >> >> I didn't read the last paragraph of John's message until just now, and >> now realize that what I wrote is likely way too much information for >> what he asked. >> I'm sorry. Next time I'll read everything until and including the last >> full stop. >> >> Irmen > > Don't worry, I was still unclear about what to do after reading all > the responses, even yours! But one thing that made me feel better was > that I wasn't having a Python problem as much as a *math* problem. I > changed my get_factors function to only go as far as the square root > of the number in question, and that yielded an answer immediately. :) Ok, cool :) > However, even after reading the Wikipedia page about prime numbers and > trial division, I'm still a little unclear as to why the square root > of the number is the upper bound of the range you need to check. If there is an exact divisor d >= √n, then the quotient n/d is also a divisor of n, and that quotient is <= √n. So if we don't find such a quotient before reaching √n, it's not useful to search for d > √n (because no divisors would be found). Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: Security test of embedded Python
On 22-6-2011 4:44, Chris Angelico wrote: > Followup: The test box has been administratively taken offline after > about an hour of testing. Thank you to everyone who participated; it > seems we have a lot of changes to make! > > Monty failed the test. But it was an incredibly successful test. And > hopefully, we'll be bringing things back online for another shot once > things are sorted out! > > Chris Angelico Maybe you should have a look at sandboxed pypy? http://pypy.org/features.html#sandboxing (disclaimer: never used it myself) Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: sorry, possibly too much info. was: Re: How can I speed up a script that iterates over a large range (600 billion)?
On 22-6-2011 5:02, John Salerno wrote: > Thanks. So far they are helping me with Python too, but definitely not > as much as more general exercises would, I'm sure. The part about > writing the code is fun, but once that's done, I seem to end up stuck > with an inefficient implementation because I don't know the math > tricks behind the problem. > > I'll check out rubyquiz.com. I've been searching for some Python > exercises to do but haven't found too many sites with them, at least > not in such a nice and organized way as Project Euler. There's also SPOJ; http://www.spoj.pl/problems/classical/ It has tons of problems, many math related, but also silly ones like this: https://www.spoj.pl/problems/JAVAC/ and perhaps even useful ones like this: https://www.spoj.pl/problems/ONP/ Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: windows 7 create directory with read write execute permission for everybody
On 26-6-2011 22:57, Gelonida wrote: > Hi, > > What do I have to do under python windows to create a directory with all > permissions, > such, that new files / directories created below will inherit the permissions. > > > The reason I am asking is, that I'd like to create a directory structure > where multiple > users should be allowed to read / write / create files and directories. Isn't this the default when you create a new directoy in Windows? (unless you're creating it in some location where access is restricted, for instance C:\ or c:\program files). I'd try os.mkdir first in any case and check if it does the job. > Alternatively it would be even better to specify exactly which users should > be allowed > to access the directory tree. Sorry, can't help you with this. I guess you'll need to use the windows extensions for Python here and deal with user accounts and ACL's. Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: windows 7 create directory with read write execute permission for everybody
On 26-6-2011 23:53, Gelonida wrote: > > Yep I'm afraid that's the way to go and where I hoped somebody would have a > few tiny > example lines or pointers to the functions in question to be used. Maybe this is a bit of a help: http://timgolden.me.uk/python/win32_how_do_i/add-security-to-a-file.html Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: Problem!!
On 4-7-2011 1:41, amir chaouki wrote: > i have written code on linux for parsing text files and it works great > but when i try to run it on windows it goes crazy, do you have any > idea??? No, I misplaced my crystal ball. Irmen P.S. http://www.catb.org/~esr/faqs/smart-questions.html -- http://mail.python.org/mailman/listinfo/python-list
Pyrolite - a lightweight interface library to connect java to python
Hi,
What's a java interface library doing in comp.lang.python, you might ask.
Well, this one, called 'Pyrolite' is meant to be a lightweight library (<50kb)
to
interface your java application to Python in a very easy and straightforward
way.
Pyrolite uses the Pyro protocol to call methods on remote objects. This means
it also
contains an almost complete implementation of Python's pickle protocol (which
can be
used independently).
A small piece of example code (java):
import net.razorvine.pyro.*;
NameServerProxy ns = NameServerProxy.locateNS(null);
PyroProxy something = new PyroProxy(ns.lookup("Your.Pyro.Object"));
Object result = something.call("methodname",42,"arguments",[1,2,3]);
Info, source, download and javadocs: http://irmen.home.xs4all.nl/pyrolite/
Readonly direct svn repository access: svn://svn.razorvine.net/Various/Pyrolite
More info on Pyro: http://irmen.home.xs4all.nl/pyro/
Pyrolite is an experiment. You can use Jython+Pyro as well but I was interested
in the
possibilities of a lightweight client-only library. Please let me know your
thoughts
about it, and if you decide to use it :-)
Enjoy!
Irmen de Jong
--
http://mail.python.org/mailman/listinfo/python-list
Re: Any suggestion to start more threads at the same time?
On 28-7-2011 23:07, smith jack wrote: > I start many threads in order to make the work done, when the > concurrent number is set to 300, all thing just works fine, but when > the number is set to 350 or higher, error just comes out? what's wrong > ? the error info is just as follows: failed to start . > > I am confused, does this have something to do with the operating > system, i am now using Linux, any suggestion to make the system to > support more python threads? > > thank you :) I don't think that many threads are going to help you in any meaningful way. Especially with Python's GIL. Can't you redesign your program to use a fixed number of threads such as 1 per cpu core? Or check out the multiprocessing module. But yeah, I think your OS is preventing you from creating more threads (either due to some artificial limit or due to lack of system memory). Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: PIL question. having exactly same font on multiple platforms
On 4-8-2011 20:54, Gelonida N wrote: > The reason why I want the images to look identical is very simple. > Though the final web server will run on a linux server, I use sometimes > windows for development or as test server. > > For automated tests I would have liked pixel identical images. > this allows calculating the md5sum of images to know whether > a regression in the image layout occured. Well I can live without it. Then don't run your automated tests on the dev server but deploy your stuff to a separate test server first, that runs the same software as production. And run the tests there. > The second (more import issue) is, that the images should look the same > whether created on a Windows or Linux host. > > I didn't know that PIL delegated font rendering to the underlying OS, > but thought it contains its own rendering. I'm pretty sure it does have that indeed; it links with the freetype library. Are you sure you're not just seeing differences because of differences in the typeface itself? A courier.ttf on one system can look very different from a ms-courier-new.ttf on another... > Here the problem is not if a few pixels are different, but currently I > even don't know how to choose a font, and make sure it exists on both > platforms. I also don't know how I can write portable python code, that > will find a given font on windows and on linux independent of the exact > font location. I once made a module that uses PIL to draw captcha images. It uses one of the free truetype font files that I just place next to the code. I downloaded the ttf files from http://www.fontgirl.com/ but there are dozens of free font sites. Just be sure to check the license terms of the the typeface files. As far as I know, I did not see any difference in output on windows, linux and mac os x as long as the code used the same ttf file and PIL versions. (but I'll double check now and see if I remember this correctly). Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: PIL question. having exactly same font on multiple platforms
On 4-8-2011 21:30, Irmen de Jong wrote: > As far as I know, I did not see any difference in output on windows, linux > and mac os x > as long as the code used the same ttf file and PIL versions. (but I'll double > check now > and see if I remember this correctly). To follow up on myself, I've just tested it with the same ttf file on windows, os x and linux. (made an image in font size 40 with 'The quick brown fox' as text line) The resulting image files were byte-identical between os x and linux but the windows ones were slightly different (just by a few bytes). The text in the image itself looked identical though to the ones from the other systems (I couldn't see any difference by looking at it) so I presume the difference is in the image compression or file header metadata. PIL's font rendering seems to produce identical results across platforms and if you see a difference it must be caused by a difference in typeface file (or perhaps a different PIL/freetype version on the platform). Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: Table Driven GUI Definition?
On 05-08-11 19:53, Tim Daneliuk wrote: I have a task where I want to create pretty simple one page visual interfaces (Graphical or Text, but it needs to run across Windows, Cygwin, Linux,*BSD, OSX ...). These interfaces are nothing more than option checklists and text fields. Conceptually something like: Please Select Your Installation Options: Windows Compatibility Services _ Linux Compatibility Services_ TRS-DOS Compatibility Services _ What Is Your email Address: ___ What I'm looking for is a way to describe such forms in a text file that can then be fed into a tool to generate the necessary pyGUI, Tkinter, (or whatever) code. The idea is that it should be simple to generate a basic interface like this and have it only record the user's input. Thereafter, the python code would act on the basis of those selection without any further connection to the GUI. An added bonus would be a similar kind of thing for generating web interfaces to do this. This might actually be a better model because then I only have to worry about a single presentation environment. Ideas anyone? Yeah, HTML being the text file and a web browser being the tool to transform it into a GUI... You can hook this up with a simple web server or web framework running locally to grab the submitted form results when the form is complete and process them in a piece of python code. Wouldn't that work? Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: Object Diffs
On 08-08-11 21:50, Croepha wrote: Hello Python list: I am doing research into doing network based propagation of python objects. In order to maintain network efficiency. I wan't to just send the differences of python objects, I was wondering if there was/is any other research or development in this area? I was thinking that I could look at how pickle works an implement a diff system there, or I could actually create a pickle of the object and then use difflib to compare the flattened text... Ideas, or comments welcome No Python code, but you may want to have a look at the DeltaCompressor of the Kryo serializer (written for Java). http://code.google.com/p/kryo/ (disclaimer: I haven't used it, just read a little bit about it) Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: SocketServer expceion after upgrading to 2.7
On 10-08-11 15:42, Laszlo Nagy wrote:
Exception happened during processing of request from ('80.99.165.122',
56069)
Traceback (most recent call last):
File "/usr/local/lib/python2.7/SocketServer.py", line 284, in
_handle_request_noblock
self.process_request(request, client_address)
File "/usr/local/lib/python2.7/SocketServer.py", line 311, in
process_request
self.shutdown_request(request)
File "/usr/local/lib/python2.7/SocketServer.py", line 459, in
shutdown_request
request.shutdown(socket.SHUT_WR)
TypeError: shutdown() takes exactly 0 arguments (1 given)
I get this error with a program, after upgrading to python 2.7. I'm
using a program that is based on SocketServer and SimpleXMLRPCDispatcher.
Any idea how to fix this?
Strange, I expected at least one or two more stack frames in the
traceback you posted (from within the socket.py module).
What platform are you on?
What python version?
What does this print on your system:
>>> import socket
>>> s=socket.socket()
>>> s.shutdown(socket.SHUT_WR)
Irmen
--
http://mail.python.org/mailman/listinfo/python-list
Re: Dialog boxes in curses
On 13-8-2011 17:21, f...@slick.airforce-one.org wrote: > Hello. > > I've googled for hints but I didn't find anything, I hope it's not an > RTFM question :^) > > I want to have dialog boxes (a message with Yes/No/Cancel options, > possibly with keyboard accels) in python + curses. > > Does anyone have a pointer to docs about this? > > Thanks! > Have you considered using Urwid instead? http://excess.org/urwid/ Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: Ten rules to becoming a Python community member.
On 14-8-2011 7:57, rantingrick wrote: > 8. Use "e.g." as many times as you can! (e.g. e.g.) If you use "e.g." > more than ten times in a single post, you will get an invite to > Guido's next birthday party; where you'll be forced to do shots whist > walking the balcony railing wearing wooden shoes! I lolled about this one, e.g. I laughed out loud. But where are the tulips and windmills for extra credit? Greetings from a Dutchman! Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: pythonw.exe
On 14-8-2011 15:23, Ronald Reynolds wrote: > Dear Python Friends: > in my python directory there is a python.exe file which I understand > completely but there is also a pythonw.exe DOS seems to honor the pythonw > command (No error message) but nothing happens. What is pythonw.exe? > Also is there a way to invoke idle from the DOS prompt? I tried idle > filename.py and just idle. Is there any .exe for idle? > > Sincerely, 'Ron "bumpker" Reynolds' pythonw.exe is the same as python.exe but it doesn't open a console window, and launches python in the background. This allows you to easily run background programs or GUI programs in a nicer way (without a dummy console window popping up). Idle has no .exe as far as I know but you can start it like this: pythonw -m idlelib.idle You could create an alias or batch file called 'idle' that does this. Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: Idea for pure-python templates using AST.
On 16-08-11 13:33, Paul Wray wrote: The idea: Python syntax allows a statement to be a bare literal or identifier. These have no effect on the program. So the function below is legal python: def myFunc(): 'a' x = 45 'b'; 'c'; x So is this (within the appropriate class context of course): def body(self, r): ''; self.heading; '' '' for itm in self.items: ''; itm; '' '' Looks very similar to PTL what Quixote uses: http://www.quixote.ca/overview/paper.html (never used it though, and I doubt Quixote used ASTs) Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: Python Windows Extensions for Mac
On 21-8-2011 1:51, Johnny Venter wrote: > Thank you all for the replies. I would like to query various Windows' objects > and > resources from Mac and/or Linux such as Active Directory users, network > shares, group > members, etc... What module or methods can I use with python to accomplish > this? A way to approach this problem is installing Python + windows extensions on the actual windows machine(s) you want to query. Then create some form of a server process that does the windows specific stuff locally, and exposes an interface with the functions you want to provide to your remote machine(s). Talk with the server process using some form of platform independent IPC, for instance Pyro: http://pypi.python.org/pypi/Pyro4/ Be careful what methods you expose this way though (security issues!) Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: relative speed of incremention syntaxes (or "i=i+1" VS "i+=1")
On 21-08-11 19:03, Laurent wrote: Well I agree with you about string concatenation, but here I'm talking about integers incrementation... Seems the two forms are not 100% identical: >>> import dis >>> def f1(x): ... x=x+1 ... >>> def f2(x): ... x+=1 ... >>> >>> dis.dis(f1) 2 0 LOAD_FAST0 (x) 3 LOAD_CONST 1 (1) 6 BINARY_ADD 7 STORE_FAST 0 (x) 10 LOAD_CONST 0 (None) 13 RETURN_VALUE >>> dis.dis(f2) 2 0 LOAD_FAST0 (x) 3 LOAD_CONST 1 (1) 6 INPLACE_ADD 7 STORE_FAST 0 (x) 10 LOAD_CONST 0 (None) 13 RETURN_VALUE >>> What the precise difference (semantics and speed) is between the BINARY_ADD and INPLACE_ADD opcodes, I dunno. Look in the Python source code or maybe someone knows it from memory :-) Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: Pickle a list
On 07-03-11 17:38, Rogerio Luz wrote: import sys import pickle class MyClass: teste = 0 nome = None lista = ["default"] def __init__(self): for reg in range(1,10): self.lista.append(reg) ^^ This probably doesn't do what you think it does. It actually appends a range of numbers to the class attribute 'lista', and not to the instance attribute of that name (which doesn't exist). If you create multiple objects of type MyClass you'll notice that everytime the list gets longer and longer (...in *all* objects, because they still share the single class attribute!) self.nome = "TestStr" self.teste = 19900909 [...snip...] The myClass object you're pickling doesn't have a 'lista' attribute. While you can print myClass.lista without problems, you're printing the class attribute instead. Pickle won't include class attributes. It just pickles the object's __dict__. If you add a line: print(myClass.__dict__) before the pickle() call you'll see that 'lista' is not in there. And that means that when you read the pickle back in, the new object won't have the 1,2,3,4,5 numbers in the lista list, instead it just has the initial list. You probably want to initialize self.alist in the class's __init__ method instead. That way it is a normal object attribute and will get pickled normally. Irmen de Jong -- http://mail.python.org/mailman/listinfo/python-list
Re: Do you monitor your Python packages in inux distributions?
On 12-3-2011 20:26, s...@pobox.com wrote: I'm one of the SpamBayes developers and in a half-assed way try to keep track of SB dribbles on the net via a saved Google search. About a month ago I got a hit on an Ubuntu bug tracker about a SpamBayes bug. As it turns out, Ubuntu distributes an outdated (read: no longer maintained) version of SpamBayes. The bug had been fixed over three years ago in the current version. Had I known this I could probably have saved them some trouble, at least by suggesting that they upgrade. I have a question for you people who develop and maintain Python-based packages. How closely, if at all, do you monitor the bug trackers of Linux distributions (or Linux-like packaging systems like MacPorts) for activity related to your packages? How do you encourage such projects to push bug reports and/or fixes upstream to you? What tools are out there to discover which Linux distributions have SpamBayes packages? (I know about rpmfind.net, but there must be other similar sites by now.) Hello Skip. I'm the author of Pyro and had something similar happening a while ago. Ubuntu being the distribution in case, and they decided to upgrade their package to the still-not-stable version 4 of Pyro. But version 4 is incompatible with Pyro3. Predictably, soon afterwards, complaints and bug reports started to appear. I wasn't aware of all this until I was contacted by a Debian (or Ubuntu, but it doesn't really matter) user directly to alert me to the problem. I *did* know that Debian and Ubuntu have been including Pyro as a package for quite a while, but I'm not following their activity much. (Via the package 'homepage' I contacted the package maintainer and things have been sorted out.) I tend to glance on the deb package 'homepage' once in a while (few months) to see if something interesting pops up in their tracker and such, but I'm doing that randomly. Also I'm not actively encouraging anybody to push tracker issues upstream to me. I'm not spending much time on Pyro, and it seems people know how to find me anyway. What distros decide to do with it is their business, I'm just hoping the package maintainer is smart enough to know what to do with the issues reported on their trackers (if any). Besides Debian and Ubuntu I'm not aware of any other distro that includes a Pyro package. I found out about Debian/Ubuntu by googling. All in all probably not a very helpful example but I thought I'd share my experience. Cheers Irmen de Jong -- http://mail.python.org/mailman/listinfo/python-list
Re: How to schedule execution of code?
On 15-03-11 08:16, Virgil Stokes wrote: Suppose that I have some Python code (vers. 2.6) that has been converted into an *.exe file and can be executed on a Windows (Vista or 7) platform. What can one do to have this *.exe executed at a set of specific times each day? In addition, if a day is missed (e.g. computer on which it resides goes down), then it will be executed the next time the computer is successfully started up. It might be useful to know that the purpose of this code is to collect data from a set of RSS feeds. Any suggestions would be appreciated. Have you tried the Windows Task Scheduler tool? Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: What breaks if I remove lib/python2.7/test/* ?
On 19-4-2011 19:06, cjblaine wrote: > What breaks if I remove lib/python2.7/test/* ? What purpose does it serve? > > It is 26MB for me. > > I am trying to trim my Python install for good reason. > > Thanks for any info! Terry answered what it is for. Personally, I also once used some functions from test.test_support in my own code. There's some handy stuff in there. Also, the venerable Pystone lives in test.pystone. However, I don't think the test/* stuff is actually considered to be part of the standard library? I believe it becomes available on many Linux installations only after installing the python-dev package (or similar). So my guess is that you are safe to delete it if you really need the disk space. -Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: Problem receiving UDP broadcast packets.
On 20-4-2011 0:21, Grant Edwards wrote: > I'm have problems figuring out how to receive UDP broadcast packets on > Linux. > [...] > Here's the sending code: > > send.py--- > #!/usr/bin/python > import sys,socket,time > > host = sys.argv[1] > port = 5010 > > s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) > s.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1) > s.bind((host,port)) I don't think you should use s.bind() at all in the sending code. Could that be at least part of the problem? -Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: Problem receiving UDP broadcast packets.
On 20-4-2011 1:21, Grant Edwards wrote: > > If I don't call bind(), then the broadcast packets go out the wrong > interface on the sending machine. > Fair enough. Next issue then: as far as I know, broadcast packets are by default not routed across subnets by gateways. Which is a good thing. That would explain why your receiver doesn't see the packets unless its interface IP address is in the same subnet as the sender's. However it doesn't explain (for me) why the tcpdump program running on that same receiver machine still happily spits out received packets. Unless the routing between the subnets is somehow done on the receiving machine itself? My knowledge of networks and TCP/IP ends here I'm afraid. Cheers Irmen. -- http://mail.python.org/mailman/listinfo/python-list
Re: Remote Connection
On 20-04-11 05:26, ray wrote: The speech commands will scripted in Python. Dragonfly is the Python project to coordinate this but does not address connectivity. So I am wondering if there have been any Python projects to address the connectivity. ray I'm not quite sure what you want exactly, but maybe one or more of the available Python rpc modules/libraries can be used to your needs? They offer communication between Python processes on separate machines, but may not be entirely suitable for your needs of audio data transfer. Still, they should be able to transfer chunks of audio data in some way to a remote machine. Some protocols are better suited for this than others. Some libraries that may be useful perhaps: Pyro (see http://pypi.python.org/pypi/Pyro4/ ) xmlrpclib (part of the standard library) or perhaps even httplib or ftplib ? Hth, Irmen. -- http://mail.python.org/mailman/listinfo/python-list
Re: suggestions, comments on an "is_subdict" test
On 22-4-2011 15:55, Vlastimil Brom wrote: > Hi all, > I'd like to ask for comments or advice on a simple code for testing a > "subdict", i.e. check whether all items of a given dictionary are > present in a reference dictionary. > Sofar I have: > > def is_subdict(test_dct, base_dct): > """Test whether all the items of test_dct are present in base_dct.""" > unique_obj = object() > for key, value in test_dct.items(): > if not base_dct.get(key, unique_obj) == value: > return False > return True > > I'd like to ask for possibly more idiomatic solutions, or more obvious > ways to do this. Did I maybe missed some builtin possibility? I would use: test_dct.items() <= base_dct.items() -irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: windows 7 x64 shutdown
On 25-4-2011 23:15, rjmccorkle wrote: > does anyone know a solution to shutting down windows 7 x64 via python > script? the win32 obviously doesn't work... something similar? http://goo.gl/5tVPj (a recipe on activestate, First hit on Google for 'python ctypes shutdown') Works fine on my win7 x64 system. I don't think that using 32-bits API will stop you from doing stuff like this. -irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: Have you read the Python docs lately?
On 27-4-2011 19:56, Raymond Hettinger wrote: > A number of developers have been working on adding examples and useful > advice to the docs. To sharpen your skills, here are some pieces of > recommended reading: > > http://docs.python.org/dev/library/heapq.html#priority-queue-implementation-notes > > http://docs.python.org/dev/library/bisect.html#searching-sorted-lists > > http://docs.python.org/dev/library/re.html#writing-a-tokenizer > > http://docs.python.org/dev/library/cmd.html#cmd-example > > http://docs.python.org/dev/library/collections.html#ordereddict-examples-and-recipes > > http://docs.python.org/dev/howto/logging.html > > http://docs.python.org/dev/howto/sorting.html > > http://docs.python.org/dev/library/collections.html#collections.namedtuple > > > Raymond Awesome. More reasons to browse the docs online instead of using the ones that get installed locally with your Python distribution :) Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: Today's fun and educational Python recipe
On 04-05-11 20:17, Raymond Hettinger wrote: Here's a 22-line beauty for a classic and amazing algorithm: http://bit.ly/bloom_filter The wiki article on the algorithm is brief and well-written: http://en.wikipedia.org/wiki/Bloom_filter It turns out that people in the 1970's were pretty smart :-) I think that often, the cleverness of people is inversely proportional to the amount of CPU power and RAM that they have in their computer. "Meh, what would I need such a thing for, I could just as well stick everything into a list" Thankfully there are also people for whom this doesn't count. (are they stuck in the '70s?) Also: wasn't there a talk on Pycon in which a bloom filter was mentioned? Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: Today's fun and educational Python recipe
On 04-05-11 21:13, Raymond Hettinger wrote: It turns out that people in the 1970's were pretty smart :-) I think that often, the cleverness of people is inversely proportional to the amount of CPU power and RAM that they have in their computer. The Google guys have plenty of CPU power *and* plenty of cleverness :-) Haha, true. We need to add a Googlyness factor in the equation. Or perhaps: think what they could achieve if they only had a few machines instead of thousands ;-) Also: wasn't there a talk on Pycon in which a bloom filter was mentioned? Yes! As a matter of fact there was: http://www.slideshare.net/c.titus.brown/pycon-2011-talk-ngram-assembly-with-bloom-filters Thanks, that was the one. I didn't attend Pycon but I watched a truckload of talks on blip.tv and that one caught my attention because of its somewhat funny title 'handling ridiculous amounts of data with probabilistic data structures' I didn't understand all of it but the name Bloom Filter stuck, it seems. Adding it to my list of bookmarks of useful-stuff-I-intend-to-use-one-day-in-the-future... Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: PIL: The _imaging C module is not installed
On 06-05-11 15:56, Nico Grubert wrote: However, running the selftest still fails: $ python selftest.py *** The _imaging C module is not installed I had this happening to me as well someday. I recall that first installing it (python setup.py install), and then rerunning selftest, solved that error. Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: PIL: The _imaging C module is not installed
On 9-5-2011 8:22, Nico Grubert wrote: >> I had this happening to me as well someday. >> I recall that first installing it (python setup.py install), and then >> rerunning selftest, solved that error. > > I tried that as well. > Here is the summary of the install process: > > build/temp.linux-x86_64-2.4/libImaging/ZipEncode.o -L/usr/local/lib > -L/usr/lib -ljpeg > -lz -o build/lib.linux-x86_64-2.4/_imaging.so [...] > > $ python selftest.py > *** The _imaging C module is not installed > Don't know why the build seems to fail. PIL installs and works fine on all computers I've installed it on recently... What happens when you just forget about selftest and run python and type import Image? Doesn't the package manager on CentOS offer a python-imaging, python-pil or whatever precompiled and configured package? If not (why not!?) try pip install PIL. Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: Finding the bitness of an arbitrary executable with Python
On 9-5-2011 22:52, Andrew Berg wrote:
> I need to find whether a given file is 32-bit or 64-bit (and raise an
> exception if the file doesn't exist or isn't an executable file). I
> thought platform.architecture() would do this, but it returns ('64bit',
> '') no matter what value I assign to the executable parameter (looks
> like it uses the given executable to find info on the underlying system
> rather than info on the specific file, reverting to sys.executable if
> there are any errors). A quick look on Google doesn't give me anything
> useful. Something cross-platform would be nice, but it really only needs
> to work on Windows (on win32 binaries).
A few options are mentioned here:
http://stackoverflow.com/questions/1345632/determine-if-an-executable-or-library-is-32-or-64-bits-on-windows
-irmen
--
http://mail.python.org/mailman/listinfo/python-list
experiments with dictionary attacks against password hashes, in Python
Hi, I've been experimenting a little with dictionary attacks against password hashes. It turned out that Python is plenty fast for this task, if you use precomputed hash databases. I used a few rather large dictionary files (most of the words of the English language, and most of the words of the Dutch language including derived forms) for a total of almost 600,000 precomputed hashes. With that the program can "crack" 10,000 password hashes in under a second on my 3 year old PC. I've also used a list of 600 'most commonly used' passwords that I gathered from a few sources. That list is used to generate a couple of variations, such as prefixing them with a digit, or typing the word in uppercase, etc. I did this to be able to quickly scan for the most common passwords, but it turned out that using all of the 600,000 precomputed hashes isn't much slower for the experiments that I did. The variations however increase the hit rate because words like "Jennifer9" are not in a normal dictionary file. This one however *is* part of the 'most common' list. So if that is your password, go change it right now ;-) I thought the code I wrote might interest other people as well, so I share it here: (It should run on Python 2.6 and up, including Python 3.x.) Download: http://www.razorvine.net/download/dictionary_attack/ Or by Subversion: svn://svn.razorvine.net/Various/PythonStuff/trunk/dictionaryattack Have fun, Irmen de Jong -- http://mail.python.org/mailman/listinfo/python-list
referring to package scope from module, using relative import?
Hi, I have a package with several modules in it. The package also has some objects created in the package scope (done in the package __init__.py). Is it possible to access those package scope objects from the modules, with relative imports or something? So that I don't have to import the package itself in its own submodules? Example: A/ __init__.py-> creates A.something thing.py -> needs to do "import A" to access A.something would like to not have to import A I think it's something simple I'm missing... Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: referring to package scope from module, using relative import?
On 21-5-2011 22:00, Ian Kelly wrote: > Note that PEP 8 discourages relative imports and encourages absolute > imports, though. This would be the preferred way to do it: > > from A import something Right. I got rid of the silly relative import stuff. As an added bonus, this makes my original question irrelevant :) Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: hash values and equality
On 22-5-2011 0:55, John Nagle wrote: > On 5/19/2011 11:33 PM, Ulrich Eckhardt wrote: > >> For that reason, it is generally useful to use immutable types like >> integers, floats, strings and tuples thereof as keys. Since you can't change >> them, you basically have the guarantee that they hash the same. > >Right. It's something of a lack that Python doesn't > have user-defined immutable objects. > > John Nagle > collections.namedtuple is rather powerful though... and can be used as key AFAIK. Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: The worth of comments
On 27-05-11 15:54, Grant Edwards wrote: On 2011-05-27, Ben Finney wrote: Richard Parker writes: On May 26, 2011, at 4:28 AM, python-list-requ...@python.org wrote: My experience is that comments in Python are of relatively low usefulness. (For avoidance of doubt: not *zero* usefulness, merely low.) I've seen plenty of comments who's usefulness was not zero. It was less than zero. Someone once taught me, "There is one thing worse than having no comments in the source code: having incorrect (or 'lying') comments in the code." Grant, I guess you hint at such comments? Irmen. -- http://mail.python.org/mailman/listinfo/python-list
Re: The worth of comments
On 27-5-2011 19:53, Grant Edwards wrote: > On 2011-05-27, Irmen de Jong wrote: >> On 27-05-11 15:54, Grant Edwards wrote: >>> On 2011-05-27, Ben Finney wrote: >>>> Richard Parker writes: >>>> >>>>> On May 26, 2011, at 4:28 AM, python-list-requ...@python.org wrote: >>>>> >>>>>> My experience is that comments in Python are of relatively low >>>>>> usefulness. (For avoidance of doubt: not *zero* usefulness, merely >>>>>> low.) >>> >>> I've seen plenty of comments who's usefulness was not zero. It was >>> less than zero. >> >> Someone once taught me, "There is one thing worse than having no >> comments in the source code: having incorrect (or 'lying') comments >> in the code." >> >> Grant, I guess you hint at such comments? > > Yes. :) > > When trying to find a bug in code written by sombody else, I often > first go through and delete all of the comments so as not to be > mislead. > > The comments reflect what the author _thought_ the code did > _at_some_point_in_the_past_. What matters is what the code actually > does at the present. > I'm going to share this thread, and the funny slideshow about Uncomment your code, with my team at work :-) We're not a Python shop so I'm probably the only one reading this, but as usual there is a lot of wisdom going on in this newgroup that is not only applicable to Python. Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: The worth of comments
On 28-5-2011 15:36, Roy Smith wrote: > In article , > Grant Edwards wrote: > >> When trying to find a bug in code written by sombody else, I often >> first go through and delete all of the comments so as not to be >> mislead. > > I've heard people say that before. While I get the concept, I don't > like doing things that way myself. > >>> The comments reflect what the author _thought_ the code did >> _at_some_point_in_the_past_. What matters is what the code actually >> does at the present. > > I don't look at it that way. Most of the comments I write are to > document interfaces, i.e. what the code is supposed to do. That's the > contract between you and the code. If you call me with arguments that > meet these conditions, this is what I promise I'll return to you (and > what side effects I'll perform). I don't see how that is opposed to what Grant was saying. It's that these 'contracts' tend to change and that people forget or are too lazy to update the comments to reflect those changes. The comments you are writing, saying what the code is supposed to do, are only saying what the code is supposed to do at the moment in time that you were writing the comment and/or the code, are they not? > One reasonable definition of a bug is something the code actually does > which differs from the documented interface. Unless you know what the > code is supposed to do, how can you possibly look at it and say whether > it has a bug or not? For example, take this function: > > def foo(): >l = [1, 2, 3] >return l[3] > > Is this code correct? Unit tests should tell you. > I'll bet most people would look at this and say, > "I'm not sure what he had in mind, but whatever it was, this has to be a > bug because he's indexing past the end of the list". I do agree that reading just that piece of code without other information, makes me think that it is fishy. But: > Well, what if I > showed you the interface contract: > > def foo(): >"Raise IndexError. This is useful as a testing fixture." >l = [1, 2, 3] >return l[3] > > Now it's obvious that the function does exactly what it's supposed to do > (even if it's not the best way to do it). A month later the requirement changes: it should raise a ZeroDevisionError instead. Someone modifies the code but leaves the comment (for whatever reason). def foo(): "Raise IndexError. This is useful as a testing fixture." return 1//0 Unless there is a way to force people to update the code comment as well (which I'm not aware of.. Doctests? dunno...), you now have a comment that lies about the the intended working. In my opinion that is worse than what we had before (the function without comment). That being said, I do write code comments myself. Some of them are like notes, directed to future-me or other future readers (remember that we do this because blabla, don't change this to such-and-such because it will probably break xyz) and some of them are stating the contract of the code (like you wrote above, about documenting interfaces). I always try to avoid writing comments that duplicate the working of the code itself in pseudo code or text phrases. But humans make mistakes and forget things so after enough modifications my code probably contains lies as well... :( Irmen de Jong -- http://mail.python.org/mailman/listinfo/python-list
Re: The worth of comments
On 29-5-2011 2:47, Gregory Ewing wrote: > Irmen de Jong wrote: > >> I don't see how that is opposed to what Grant was saying. It's that these >> 'contracts' >> tend to change and that people forget or are too lazy to update the comments >> to reflect >> those changes. > > However, I can't see that deleting the comment documenting the > contract can be the right response to the situation. > > If the contract comment doesn't match what code does, then > there are two possibilities -- the comment is wrong, or the > code is wrong. The appropriate response is to find out which > one is wrong and fix it. Fair enough. Certainly I won't be deleting every source code comment encountered from now on, but I do think we should keep in mind the risks already mentioned. In some situations I can very well imagine it is best to simply delete any comments and go with just the code. > If you simply delete the comment, then you're left with no > redundancy to catch the fact that something is wrong. You are right, if you don't have a Unit test for it. Then again, faulty unit tests are a problem in their own right... Irmen de Jong -- http://mail.python.org/mailman/listinfo/python-list
Re: How to Use Setuptools, Alternatives?
On 29-5-2011 23:41, ray wrote: > I have Python 2.7 on Win7 Pro on a tightly locked down desktop. I > would like to install Networkx from an egg. From what I have read, > Setuptools can be used for this. What does 'tightly locked down' mean? > I don't know how to install Setuptools. The exe will not work. On > execution, it reports that the Python version is not included in the > registry. That can be fixed by repairing the Python installation through its .msi. Also, are you sure you used the python 2.7 setuptools exe? > Further, I can not input the version and location on the > subsequent installation screen, the fields will not accept focus so I > can not input the values. > > Since the exe will not install, I considered using the Setuptools > egg. But it requires Setuptools. It appears to be a circle. > > What are some suggestions for installing this? > > Thanks, > ray Perhaps you can try VirtualEnv and PiP instead. Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: Alternatives to PythonPath
On 29-5-2011 23:49, ray wrote: > I am using Win7 on a tightly locked down desktop. > > Is there an alternative to using PythonPath? > What do you mean by "using PythonPath"? What doesn't work that you want to have an alternative for? Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: python in school notebooks/laptops
On 30-5-2011 16:30, jmfauth wrote: > On 30 mai, 13:09, hackingKK wrote: > > [...] > >> >> Even better, try convincing them to use Ubuntu instead of a virus >> called Where I Never Do Operations With Safety, or WINDOWS for short. >> That way Python will come by default and VB will be out of question >> Happy hacking. >> Krishnakant. > > Do you mean one of these os's, where Python (2) is not > working properly because the *defaultencoding* is set > to utf-8? > > jmf Huh? On all of my machines, including windows and Ubuntu 11.04, sys.getdefaultencoding() returns 'ascii'. Irmen -- http://mail.python.org/mailman/listinfo/python-list
Re: wrote a commodore-64 emulator using just Python
On 08/13/2017 03:50 PM, Irmen de Jong wrote: > Hi, > > As another experiment with using just tkinter for graphics, this time I > created a > Commodore-64 emulator. You can find it here https://github.com/irmen/pyc64 [...] > There's also https://github.com/mnaberez/py65 so... possibilities? Well, I went ahead and integrated that with my emulator. With just a slight modification (that is now merged into the py65 library) I could hook it up to the bytearray that my emulator uses to simulate the C64's RAM. And letting the 'SYS' basic command kick of the 6502 simulator, rather than doing nothing, it suddenly was able to actually run real (although simple) Commodore-64 programs. Speed seems to be around 0.5x real-time on my machine. The py65 library also already provides a simple machine code monitor (assembler/disassembler) that you can use to inspect or write the machine code in the C64's memory. With some effort it should be possible to run it in the emulated screen, but for now, interaction with it is done on the console prompt. It was a great deal of fun integrating this into my project and I found it quite spectacular to see some existing Commodore-64 programs actually running unaltered. Even when they're doing nothing more than changing the screen colors and unpacking an image. At half speed. But still :-) Irmen -- https://mail.python.org/mailman/listinfo/python-list
a Boulder Dash clone with retro graphics and sound
Hi, Yet another continuation of my graphics experiments with tkinter. In the previous project I've been using tkinter bitmaps to simulate a commodore-64 screen where I exploited the possibility to change the foreground and background color of the bitmap on the fly. This conveniently matches the way the commodore 64 draws its (character-mode) graphics. This time I switched to a screen filled with hundreds of tkinter's PhotoImage objects, that can display full color images. However continuing in the spirit of the 8 bit era, instead of creating something with high-res full color graphics, I created a Boulder Dash clone using retro graphics. It's a fully functional game. You can get it here: https://github.com/irmen/bouldercaves (if you just want to play it and aren't interested in the code, get the .pyz Python zip app from the releases section) The game contains the 20 levels of the original 1980's Boulder Dash, and also plays music and soundfx. By default it uses a slightly more colorful sprite set than the original, but you can tell it to switch to the limited Commodore-64 color palette. You need Python 3.5+ and pillow and sounddevice/pyaudio to play it. If you disable sound, only pillow is enough. It runs very well at 30hz refresh rate on my Linux box, but seem to have some performance issues on Windows and Mac OS. Your mileage may vary, and you can tweak some parameters on the command line to eventually make it run smoothly. It was a joy to learn about the inner workings of one of my favorite games when I was a kid, and how to translate that into modern software. I haven't been able to finish the game so far! I guess I have to learn again how to actually play this after 30 years. There's just two things missing I think: - high score table - being able to play multiple sounds simultaneously, as the amoeba and magic wall sounds are lacking at the moment. (And the sprite set I used contains a lot more objects and creatures than the original game so it begs for adding extended game logic and levels with new mechanics... who knows...) This project was heavily inspired by: http://codeincomplete.com/posts/javascript-boulderdash/ and http://www.boulder-dash.nl/ Have fun :-) Irmen -- https://mail.python.org/mailman/listinfo/python-list
Re: a Boulder Dash clone with retro graphics and sound
On 05/09/2017 00:02, Irmen de Jong wrote: https://github.com/irmen/bouldercaves > There's just two things missing I think: > - high score table > - being able to play multiple sounds simultaneously, as the amoeba and > magic wall sounds are lacking at the moment. In version 1.2 sound mixing is implemented so the game can now play multiple samples simultaneously, and is able to play sounds in a loop. This means it now properly plays the title screen music, and the amoeba and magic wall sounds are now also in the game. (and I fixed a magic wall behavior bug as well) Saving and displaying high scores are left as an exercise for the reader :) Irmen -- https://mail.python.org/mailman/listinfo/python-list
v2.0 released of: a Boulder Dash clone with retro graphics and sound
On 06/09/2017 23:17, Irmen de Jong wrote: > > https://github.com/irmen/bouldercaves > My Boulder Dash clone is now at version 2.0 because a few important things that were lacking are now implemented: * authentic mode: The game is now displayed in a small screen that scrolls smoothly over the level, like the original game. It also has the retro c-64 color palette enabled. You enable this via a command line option. * pre-recorded demo: If you press F9 or wait a while at the title screen, the game plays back a prerecorded demo of cave A, like the original game. * synthesized sounds: Instead of using sampled sounds you can now run the game with a software sound synthesizer that creates the sounds in real time, including the title music. I've tried to simulate the sounds of the original game but ended up with slightly different ones. Maybe I'll tweak the synth to make them closer to the original, but there's a charm to the variation as well I think. All in all I am very pleased with the results. I didn't expect it to be possible creating a decently performing arcade game using just the bare essentials: - default tkinter to draw everything on the screen - pillow to load images - sounddevice to play sounds (optional). I posted this update because I now consider it a full game [1] and I think it's interesting to see that this can be realized in Python without any of the specialized 'game libraries' (pygame, etc) being used. While tkinter sometimes has troubles updating the screen at 30 hz, the Python code itself is barely breaking a sweat, even the sound synth. Have fun Irmen de Jong [1] full game: errr... there's still no highscore table. Sorry :) -- https://mail.python.org/mailman/listinfo/python-list
Re: Fw: Problems Installing Python36
On 14/09/2017 05:46, Michael Torrie wrote: > On 09/12/2017 03:05 AM, Thomas Jollans wrote: >> Other people on this list: >> This isn't the first time I've someone with this issue here. It's >> probably putting off plenty of potential new users who don't make as >> much effort to find a solution. I can't say I understand the ins and >> outs of installing things on Windows... is there anything that can be done? > > Last time I brought this up, someone mentioned that the Python installer > is supposed to automatically install this runtime library if it's not > installed already. If so, why are so many people having this problem? > That is what I'm wondering as well. The only thing I can think of is that it asks windows update to install said KB update but that it depends on something else that isn't installed or that the user running the installation doesn't have the rights to install windows updates. (I suspect something will be logged in the event viewer somewhere...?) Or that it doesn't attempt to download it at all and that we are misinformed :P Btw, I personally never had any issues installing Python on Windows. Irmen -- https://mail.python.org/mailman/listinfo/python-list
Re: Fw: Problems Installing Python36
On 09/22/2017 08:34 PM, Stephan Houben wrote: > I was vaguely tempted to offer the Mingw-w64 (GCC) Python as an > alternative, since it doesn't rely on any optionally-installed Microsoft > DLLs and so avoids this issue. But I suppose that is not really the > newbie-friendly solution the OP was looking for... Mingw? Perhaps better to choose Anaconda/Miniconda instead if you go for an alternative implementation... Irmen -- https://mail.python.org/mailman/listinfo/python-list
auto installing dependencies with pip to run a python zip application ?
Hi, I've been using Python's executable zip application feature to neatly package my little game into a single "executable" file. Here "executable" means the user can simply start it by doubleclicking it, or launching it from a shell prompt. Of course the user already has to have a proper Python installation on their system but that's okay for me. However, I would like to also take care of the library dependencies of my game. Currently it requires pillow and sounddevice. If the user doesn't have these installed, the game exits with an error message telling the user to install these dependencies manually. I was thinking about a way to automate this so that you don't have to install anything manually to run the game. I was thinking about the following solution: - assume bare default Python (3.5+) installation - use venv.EnvBuilder() to create a new virtualenv somewhere in the user's home directory (~./virtualenvs/mygreatgame ?) - use the with_pip=True argument so we also get pip installed into it - exec() the python executable from the new virtual env and let that "pip install -r mygamerequirements.txt" - inject "./mygame.pyz" in sys.modules[0] - run the game's main class and play! Notice that I'm not looking for a fully standalone executable created by things as cx_freeze, just something that is usable from within my zipped application. Any thoughts on this? Is it a good idea or something horrible? Has someone attempted something like this before perhaps? Irmen -- https://mail.python.org/mailman/listinfo/python-list
