Run VPython on FC3
Hi everybody, I am trying to run VPython on FC3. The installation was fine. But when I "import visual", an error occurs: """ >>> import visual Traceback (most recent call last): File "", line 1, in ? File "/usr/lib/python2.3/site-packages/visual/__init__.py", line 15, in ? import array_backend File "/usr/lib/python2.3/site-packages/visual/array_backend.py", line 1, in ? import cvisual ImportError: libgtkgl.so.4: cannot open shared object file: No such file or directory >>> """ It seems Python cannot open/find the file "libgtkgl.so.4", but it definitely lies in the lib directory: /usr/local/lib/libgtkgl.so.4.0.0 /usr/local/lib/libgtkgl.so.4 Does anybody know a solution for this problem? Thanks very much, York -- http://mail.python.org/mailman/listinfo/python-list
Re: Run VPython on FC3
Artur M. Piwko wrote: > In the darkest hour on Fri, 16 Sep 2005 10:44:34 -0700, > York <[EMAIL PROTECTED]> screamed: > >>It seems Python cannot open/find the file "libgtkgl.so.4", but it >>definitely lies in the lib directory: >> >>/usr/local/lib/libgtkgl.so.4.0.0 >>/usr/local/lib/libgtkgl.so.4 >> >>Does anybody know a solution for this problem? >> > > > You need libgtk-(open)gl package (i don't know the exact name in FC). > Actually the gtkgl was installed, I can find it at /usr/local/lib: /usr/local/lib/libgtkgl.so.4.0.0 /usr/local/lib/libgtkgl.so.4 - York -- http://mail.python.org/mailman/listinfo/python-list
very high-level IO functions?
Hi, R language has very high-level IO functions, its read.table can read a total .csv file and recogonize the types of each column. write.table can do the reverse. R's MySQL interface has high-level functions, too, e.g. dbWriteTable can automatically build a MySQL table and write a table of R data into it. Is there any python packages do similar things? -York -- http://mail.python.org/mailman/listinfo/python-list
Re: very high-level IO functions?
Caleb Hattingh wrote: > York > > Short answer: yes > Brilliant! and what are they? > We use python and R at work, and in general you will find python syntax > a little cleaner for functionality they have in common. R is better > for some of the more hard-wired stats stuff, though. I love python. However, as a biologist, I like some high-levels functions in R. I don't want to spend my time on parse a data file. Then in my python script, I call R to read data file and write them into an MySQL table. If python can do this easily, I don't need R at all. Cheers, -York > > On Mon, 19 Sep 2005 20:04:37 +0200, York <[EMAIL PROTECTED]> wrote: > >> Hi, >> >> R language has very high-level IO functions, its read.table can read >> a total .csv file and recogonize the types of each column. >> write.table can do the reverse. >> >> R's MySQL interface has high-level functions, too, e.g. dbWriteTable >> can automatically build a MySQL table and write a table of R >> data into it. >> >> Is there any python packages do similar things? >> >> >> -York > > -- http://mail.python.org/mailman/listinfo/python-list
Re: very high-level IO functions?
Your are right, a program cannot be smarter than its programmer. However I need a program to parse any table-format data files offered by user. R offer such a function, I hope python such a function too. -York > While it may "attempt" to recognize the types, it in fact cannot > be more correct than the programmer. Example: > > data="""0X1E04 111""" > > That "looks" lile a hex and an int. But wait. What if it is > instead two strings? > > In Python you can easily write a class with a interator that can > read the data from the file/table and return the PROPER data types > as lists, tuples, or dictionaries that are easy to manipulate. > > -Larry Bates > > York wrote: > >>Hi, >> >>R language has very high-level IO functions, its read.table can read a >>total .csv file and recogonize the types of each column. write.table can >>do the reverse. >> >>R's MySQL interface has high-level functions, too, e.g. dbWriteTable can >> automatically build a MySQL table and write a table of R data into >>it. >> >>Is there any python packages do similar things? >> >> >>-York -- http://mail.python.org/mailman/listinfo/python-list
Re: very high-level IO functions?
Thank you, Tom. -York Tom Anderson wrote: > On Mon, 19 Sep 2005, Bruno Desthuilliers wrote: > >> York a écrit : >> (snip) >> >>> I love python. However, as a biologist, I like some high-levels >>> functions in R. I don't want to spend my time on parse a data file. >> >> >> http://www.python.org/doc/current/lib/module-csv.html >> >>> Then in my python script, I call R to read data file and write them >>> into an MySQL table. If python can do this easily, I don't need R at >>> all. >> >> >> So you don't need R at all. > > > Did you even read the OP's post? Specifically, this bit: > > R language has very high-level IO functions, its read.table can read a > total .csv file and recogonize the types of each column. > ^^^ > > Python's csv module gives you tuples of strings; it makes no effort to > recognise the types of the data. AFAIK, python doesn't have any IO > facilities like this. > > Larry's point that automagical type detection is risky because it can > make mistakes is a good one, but that doesn't mean that magic is useless > - on the contrary, for the majority of cases, it works fine, and is > extremely convenient. > > The good news is that it's reasonably easy to write such a function: you > just need a function 'type_convert' which takes a string and returns an > object of the right type; then you can do: > > import csv > > def read_table(f): > for row in csv.reader(f): > yield map(type_convert, row) > > This is a very, very rough cut - it doesn't do comment stripping, > skipping blank lines, dealing with the presence of a header line or the > use of different separators, etc, but all that's pretty easy to add. > Also, note that this returns an iterator rather than a list; use > list(read_table(f)) if you want an actual list, or change the > implementation of the function. > > type_convert is itself fairly simple: > > def _bool(s): # helper method for booleans > s = s.lower() > if (s == "true"): return True > elif (s == "false"): return False > else: raise ValueError, s > > types = (int, float, complex, _bool, str) > > def type_convert(s): > for type in types: > try: > return type(s) > except ValueError: > pass > raise ValueError, s > > This whole thing isn't quite as sophisticated as R's table.convert; R > reads the whole table in, then tries to find a type for each column > which will fit all the values in that column, whereas i do each cell > individually. Again, it wouldn't be too hard to do this the other way > round. > > Anyway, hope this helps. Bear in mind that there are python bindings for > the R engine, so you could just use R's version of read.table in python. > > tom > -- http://mail.python.org/mailman/listinfo/python-list
Re: for loop question
for a in range(2, len(foo)): print a or maybe you need for a in range(1, len(foo)): print a ? York bruce wrote: > hi.. > > basic foor/loop question.. > > i can do: > > for a in foo > print a > > if i want to do something like > for a, 2, foo > print foo > > where go from 2, to foo.. > > i can't figure out how to accomplish this... > > can someone point me to how/where this is demonstrated... > > found plenty of google for for/loop.. just not this issue.. > > thanks > > -bruce > -- http://mail.python.org/mailman/listinfo/python-list
Regular expression confusion
I have two backslash - a. and I want to replace them with one backslash, but I failed: >>> import re >>> a = '' >>> re.sub(r'', '\\', '') Traceback (most recent call last): File "", line 1, in ? File "/usr/lib/python2.3/sre.py", line 143, in sub return _compile(pattern, 0).sub(repl, string, count) File "/usr/lib/python2.3/sre.py", line 258, in _subx template = _compile_repl(template, pattern) File "/usr/lib/python2.3/sre.py", line 245, in _compile_repl raise error, v # invalid expression sre_constants.error: bogus escape (end of line) >>> anybody knows why? Thanks, York -- http://mail.python.org/mailman/listinfo/python-list
Re: Regular expression confusion
Oh, that's right, the second arg is escaped by re compiler too. Thank you, John. York John Machin wrote: > York wrote: > >>I have two backslash - a. and I want to replace them with one backslash, >>but I failed: >> >> >>> import re >> >>> a = '' >> >>> re.sub(r'', '\\', '') >>Traceback (most recent call last): >> File "", line 1, in ? >> File "/usr/lib/python2.3/sre.py", line 143, in sub >> return _compile(pattern, 0).sub(repl, string, count) >> File "/usr/lib/python2.3/sre.py", line 258, in _subx >> template = _compile_repl(template, pattern) >> File "/usr/lib/python2.3/sre.py", line 245, in _compile_repl >> raise error, v # invalid expression >>sre_constants.error: bogus escape (end of line) >> >>> >> >>anybody knows why? > > > Yep. There are *two* levels of escaping happening (1) Python compiler > (2) re compiler (in the first two args, but of course only Python in > the 3rd). > To get your single backslash you need to start out with four cooked or > two raw: > > | >>> re.sub(r'', '', '') > '\\' > | >>> re.sub(r'', r'\\', '') > '\\' > > Cheers, > John > -- http://mail.python.org/mailman/listinfo/python-list
Re: Accessing class variable at class creation time
Carlos wrote: > Hi! > > class A: > X = 2 > def F(): > print A.X > F() > > The above fails because the name A is not > yet at global scope when the reference A.X > is reached. Is there any way to refer to A.X > without making explicit use of the name 'A'? How about this: >>> class A: ... X = 2 ... print X ... 2 -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: Accessing class variable at class creation time
Jan-Ole Esleben wrote: > That doesn't really give him a way of using the class variable inside a > method. Oh! I must have misunderstood the question. I'd like to know more about why the OP wants to do this; a small example would help narrow down the possibilities. -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: [RFC] Parametric Polymorphism
Catalin Marinas wrote: > Sorry if this was previously discussed but it's something I miss in > Python. I get around this using isinstance() but it would be cleaner > to have separate functions with the same name but different argument > types. I think the idea gets quite close to the Lisp/CLOS > implementation of methods. Take a look at PJE's generic function implementation. PyCon slides here: http://www.python.org/pycon/2005/papers/53/PyCon05Talk.html. -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: Python 2.4 under WinXP, free VC71 toolkit and VC6 libraries
Berthold Höllmann wrote: > I'm sure ctypes doesnot work on Linux and Solaris, but my code has > to. I've used ctypes to great effect on Linux. -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: number of python users
Magnus Lycka wrote: > To name a few concrete examples, Zope typically bundles its > own python in the installation, and can work with just one > version and let other software on the same machine use another > python of a different version. Note that Zope 3 doesn't do this. The system Python is used by default. You can always provide your own if you wish. Zope 3 is much more like a "normal" Python library in this respect. -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: list.join()... re.join()...? Do they exist? (newbie questions...)
googleboy wrote: > To get it to work I did this: > > > List[0] = list0 > List[1] = list1 > List[2] = list2 > List[3] = list3 > cat_list = list0 + '|' + flatblurb + '|' + flatcontents + '|' + flates > + '\n' > file.write(concat_list) > > But it seems to me that there is probably something more pythonic than > having to go about it in such a laborious fashion Indeed. :) cat_list = '|'.join(List) -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: How is wxWindows related to Python?
Sathyaish wrote: > However, I do not understand its correlation with Python. The > documentation page says, "wxWindows 2.4.2: A portable C++ and Python > GUI toolkit." So, my question is, "How is wxWindows related to Python?" "Pure" wxWindows (actually it's been renamed wxWidgets at the demand of Microsoft) is for C++. You're looking for wxPython: http://wxpython.org/ -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: Automating, Building, Testing and Deploying to Production Server
yoda wrote: > I realize I'm losing so much time I could spend more productively. I'd > therefore like to know the different approaches you guys employ to > deploy builds from your staging servers (or laptops:) to the production > server in an automated repeatable safe manner. > How do you automate the process? We have a system called "the buildout" that checks out a project's code, downloads and builds any dependencies, and configures a working system. (http://svn.zope.org/Sandbox/zc/buildout/trunk/) We use that for setting up new development environments (each developer generally has several builds of any project at one time). > What tools do you use and how? We also have a BuildBot setup that runs a buildout and then runs the tests and emails a list if the tests fail (http://buildbot.sf.net). You can see an example of our "public" buildbot here: http://buildbot.zope.org. > What documentation is available for the various tools? We just publicly released the buildout code a couple of weeks ago, and it seriously needs docs and tests. BuildBot doesn't have great docs, but it's configured via Python, so it's not too bad. > What is the best, easiest, most automated, method that provides robust > versioning and easy rollback? When we deploy via buildout (as opposed to by using an installer or a simple archive) we generally either just tell the buildout to update itself, or if we want the ability to "roll back" make a new buildout and switch to it (therefore we can switch back to the previous build). We don't do it this way, but because the buildout for a particular project is itself versioned, you could just "svn up" to the previous version and rebuild it and you'd be back to where you started. -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: Finding the Process Path
Peck, Jon wrote: > I have Python code running in an application, and I would like to find > the full path of the process executable where it is running. Like this? >>> import sys >>> sys.executable '/usr/bin/python' -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: New project coming up...stay with Python, or go with a dot net language??? Your thoughts please!
Luis M. Gonzalez wrote: > If not Ironpython, Boo (which could be considered almost an static > version of Python for .NET) would be a great choice. You could also use Python for .Net (http://www.zope.org/Members/Brian/PythonNet). -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: So far
CppNewB wrote: > Most of them have support for Dialogs, but what about more complex > UI's? I may need a resizable frame within a resizable frame? I > haven''t found a GUI builder with a great feel yet. I *highly* recommend wxDesigner. I've used it extensively. It's cheap and has a demo version you can download (the demo can't save your designs, but can generate code so you can try it out). -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: Matching zero only once using RE
GregM wrote: > I am trying to see if a web page contains the exact text: > You have found 0 matches It is unclear to me why you're using a regex at all. If you want to find the *exact* text "You have found 0 matches" perhaps you should do something like this: if "You have found 0 matches" in pagetext: print 'yes' else: print 'no' -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: read serial data from a barcode reader/scanner using python
Edgar wrote: > is there a way to program python to read serial data from a barcode > reader/scanner http://pyserial.sourceforge.net/ > and then using the parallel port of the PC to activate an > electromagnetic door lock. http://pyserial.sourceforge.net/pyparallel.html For other options see Google (then here if answers are not forthcoming). -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: Problems with properties
Michael Schneider wrote: > The get property access is working, but the the set > property is not working. The classes need to be "new style" for properties to work right. Just change "class Task:" to "class Task(object):". Your "setNothing" method is unnecessary, if you don't proved a "setter" an exception will be raised automatically. Also (if you're using Python 2.4) you probably want to look at decorator syntax. So you're class could look like this: class Task(object): def __init__(self,command): self._command = command @property def command(self): return self._command -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: Function to execute only once
PyPK wrote: > now I want execute() function to get executed only once. That is the > first time it is accessed. How about just calculating the value at import time? -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: String Identity Test
Thomas Moore wrote: > I am confused at string identity test: >>>>a="test" >>>>b="test" >>>>a is b > > True > About identity, I think a is not b, but "a is b" returns True. > Does that mean equality and identity is the same thing for strings? Nope: >>> a = 'te' + 'st' >>> b = 'test' >>> a is b False You're seeing a coincidence of the implementation. -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Fredericksburg, VA ZPUG Meeting: November 9, 7:30-9:00 PM
Please join us November 9, 7:30-9:00 PM, for the sixth meeting of the
Fredericksburg, VA Zope and Python User Group ("ZPUG"). Squid and
Zope! Using Zope for newspaper publishing! The dangers of object
oriented inheritance! Free food!
* Andrew Sawyers will discuss using the open source cache server
Squid with Zope, including a discussion of the O'Reilly book about
Squid.
* Allen Schmidt, Sr. Programmer for Fredericksburg.com - the
website for the Free Lance-Star - will present on "Using Zope for
Newspaper Publishing".
* Jim Fulton, CTO of Zope Corporation, will present an
abbreviated version of the argument given in Clemens Szyperski's
Component Software for why both inheritance and delegation (e.g.
acquisition) cause tight coupling and therefore should be avoided
except in special circumstances.
* We will serve delicious fruit, cheese, and soft drinks.
We've had a nice group for all the meetings. Please come and bring
friends!
We also are now members of the O'Reilly and Apress user group
programs, which gives us nice book discounts (prices better than
Amazon's, for instance) and the possibility of free review copies.
Ask me about details at the meeting if you are interested.
General ZPUG information
When: second Wednesday of every month, 7:30-9:00.
Where: Zope Corporation offices. 513 Prince Edward Street;
Fredericksburg, VA 22408 (tinyurl for map is http://tinyurl.com/duoab).
Parking: Zope Corporation parking lot; entrance on Prince Edward Street.
Topics: As desired (and offered) by participants, within the
constraints of having to do with Python or Zope.
Contact: Gary Poster ([EMAIL PROTECTED])
--
http://mail.python.org/mailman/listinfo/python-announce-list
Support the Python Software Foundation:
http://www.python.org/psf/donations.html
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Re: which feature of python do you like most?
[EMAIL PROTECTED] wrote: > I have no idea why people are so facinating with python. > So I post this question: What do you use in your dairy work with > python? I can't imagine why you're confused. -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: debugger
mclaugb wrote: > Is there a decent debugger to use with IDL? I have briefly about "PDB" but > this looks pretty limited in features and difficult to use. You might like Winpdb: http://www.digitalpeers.com/pythondebugger/ -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: debugger
[EMAIL PROTECTED] wrote: > Benji York wrote: >>You might like Winpdb: >>http://www.digitalpeers.com/pythondebugger/ > > Not Found > > The requested URL /pythondebugger/-- was not found on this server. > Apache/2.0.52 (Red Hat) Server at www.digitalpeers.com Port 80 Works for me. -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: Default method arguments
bruno at modulix wrote: > Another solution to this is the use of a 'marker' object and identity test: > > _marker = [] > class A(object): > def __init__(self, n): > self.data =n > def f(self, x = _marker): > if x is _marker: > x = self.data > print x I'll add my 2 cents to the mix: default = object() class A(object): def __init__(self, n): self.data = n def f(self, x=default): if x is default: x = self.data print x -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: ANN: Dao Language v.0.9.6-beta is release!
Ed Leafe wrote: > So let's say that you are using 4 spaces as your standard, but > by accident type 5. You hit backspace, which deletes 4 spaces, Nope, it would delete a single space. Then an additional backspace would delete the 4. > See, I can make up bizarre scenarios where spaces cause > problems, too. Only if you don't know how decent editors behave. :) -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: ANN: Dao Language v.0.9.6-beta is release!
Peter Decker wrote: > On 12/4/05, Mike Meyer <[EMAIL PROTECTED]> wrote: >>>> See, I can make up bizarre scenarios where spaces cause >>>>problems, too. >>> >>>Only if you don't know how decent editors behave. :) >> >>But the same is also true of tabs causing problems :-). > > I'm starting to suspect that the same people who are zealous about > spaces are also the same people who look down on anyone who doesn't > agree with their choice of text editor. Perhaps. As far as editor choice goes, I'm only fervent about people picking a good editor (equivalent to Vim or Emacs) and learning it well. Other than that I don't care. I'm not as diplomatic about tabs. :) -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: ANN: Dao Language v.0.9.6-beta is release!
Christophe wrote: > David Rasmussen a écrit : > >>Antoon Pardon wrote: >> >> >>>>Write shorter functions ;) >>> >>> >>>This has little to do with long functions. A class can contain >>>a large number of methods, whitch are all rather short, and your >>>class will still be spread over several pages. >>> >> >>Write classes with a smaller interface ;-) >> >>/David > > > What about an editor that will reserve the first lines in the edit > window to show the current class ? Could be a cool feature here :) I've been using a Vim script for a while that adds the name of current class, function, or Class.Method to the status line and it helps quite a bit. -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: Proposal: Inline Import
Shane Hathaway wrote: > I'd like a way to import modules at the point where I need the > functionality, rather than remember to import ahead of time. This might > eliminate a step in my coding process. Currently, my process is I > change code and later scan my changes to make matching changes to the > import statements. The scan step is error prone and time consuming. > By importing inline, I'd be able to change code without the extra scan step. > Thoughts? Why not: 1) jump to the top of the file when you need to do an import (1G in Vim), 2) add the import, 3) jump back to where you were (Ctrl-o in Vim) and keep coding. This isn't Vim specific, I suspect all decent editors have similar capabilities (I know Emacs does). Thus eliminating the unpleasant scan step. Oh, and py.std does something similar to what you want: http://codespeak.net/py/current/doc/misc.html#the-py-std-hook. -- Benji -- http://mail.python.org/mailman/listinfo/python-list
Re: Proposal: Inline Import
Shane Hathaway wrote: > Benji York wrote: [a quicker, but still manual, way to handle adding new imports] > That's something the computer should do for me. It's busywork. > Eclipse practically eliminates this busywork when I'm writing Java > code: if I autocomplete a name, it also quietly adds the > corresponding import statement. It also generates import statements > when I copy/paste code. The structure of the Java language makes > this relatively easy. Since you mentioned Eclipse, I wonder if PyDev has that feature. You may have to follow a particular coding style (like using the full module name every time). In that case any other sufficiently advanced editor could do the same. [snip] > Thus a prerequisite for using inline import is broad approval. OK, good. You won't have to worry about that. :) -- Benji -- http://mail.python.org/mailman/listinfo/python-list
Re: Proposal: Inline Import
Shane Hathaway wrote: > Benji York wrote: > >> OK, good. You won't have to worry about that. :) > > You didn't give a reason for disliking it. Oh, I don't particularly dislike it. I hadn't come up with a reason to like or dislike it, other than a predilection for the status quo. -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: Employablity of python programmers
Mir Nazim <[EMAIL PROTECTED]> wrote: I am in a fix what skill set I must choose to be safe as far as job openings are concerned. > 1) C/C++ and Python. > 2) Java and Python. > 3) Pure Python. As for pure employability, I'd choose option 2, but as a person that wants something more than employment from my work life, I'd like to share something with you: A while ago I decided that to be happy I had to decide what I wanted, *really* go after those things, and believe that the rewards would follow. For me Python had a big part to play in that, so I recently started looking for a new job, even though I already had one that was promising and secure. It also meant being willing to move myself and my family far from or home, friends, and other family members to take that new job. If we were willing to make big changes (and the accompanying sacrifices), we were going to make the most of it: I wouldn't accept anything but the right job, at the right company, with the right environment where they really needed *me*. I spent hours researching openings and companies and sent out many resumes with the hopes of finding that *one* job. Two weeks later, I was fortunate enough to begin talks with *two* very interested (and more importantly, interesting) companies. I've been at my new job (in a new house, in a new city) for about six weeks now. It's not perfect (nothing is), but I'm enjoying the job, like the people I work with, and the area we live in. We made the right choice. Go after what you really want, and you will too. -- Benji York Sr. Software Engineer Zope Corporation -- http://mail.python.org/mailman/listinfo/python-list
Re: delay and force in Python
Will Stuyvesant wrote: Streams are interesting because they are to lists like xrange is to range. Could save a lot on memory and computations. I think you're looking for generators. Below is my straight translation from Scheme code in the Wizard book to Python. Something else: this crashes with a "maximum recursion reached" . print stream_enumerate_interval(1,998) Unlike Scheme, Python isn't designed for heavily recursive algorithms. Here's a more Pythonic equivalent of your code: def count(start, stop): i = start while i < stop: yield i i += 1 def even(gen): for x in gen: if x % 2 == 0: yield x numbers = even(count(1, 999)) first = numbers.next() second = numbers.next() print second -- Benji York [EMAIL PROTECTED] -- http://mail.python.org/mailman/listinfo/python-list
Re: barchart for webpage needed
dimitri pater wrote: I am looking for a Python tool to create graphs and charts on a webpage. Chartdirector is too expensive for me. A simple script for creating a barchart should be sufficient as a starting point. If all you want are bar charts, you can get by with simple HTML. Here's one technique: http://www.siteexperts.com/tips/contents/ts13/page1.asp. -- Benji York Sr. Software Engineer Zope Corporation -- http://mail.python.org/mailman/listinfo/python-list
Re: Loop until condition is true
Cyril BAZIN wrote: > Another question could be: why is there not a statement "whileTrue" or > "loop"? I don't think the saving of a single space to transform "while True:" into "WhileTrue:" is really worth it. The same goes for "loop", the added complexity to the language (as little as it is) isn't rewarded by a large enough improvement to make it worth it. > It could be an economy of one unuseful test by loop. If by "economy" you mean "optimization", then I would suggest that the difference would be unnoticeable. -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: eval() in python
harold fellermann wrote: > >>> s="print 'hello Xah Lee :-)'" > >>> exec(s) > hello Xah Lee :-) Note that because "exec" is a statement, the parentheses above are superfluous. -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: Python can do it for me?
[EMAIL PROTECTED] wrote: > MySQL or Potsgree SQL ***remote connection***(it's the most important). > GUI interface. > Report generator. > Barcode printing. I've done all of these very successfully in Python. > Maybe PyGTK can do it for me? What do you think? I've never used PyGTK, but it looks nice. I've generally stuck with wxPython. -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: Need Python web hosting ASAP
<[EMAIL PROTECTED] asked about Python hosting> I have been *very* happy with Hard Hat Hosting (http://hardhathosting.com). (I don't have any connection with them, other than being a satisfied customer for several years.) If you want more providers you might be interested in http://wiki.python.org/moin/PythonHosting. -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: Loop until condition is true
Mike Meyer wrote: > Making None a constant broke existing code (and I just saw old code > that assigned to None). Are True and False that much more common as > variable names than None? I would think so. I know that my pre-booleans-in-Python code routinely did something like "from booleans import True, False". Of course the fix is easy, but it still must be applied before the code will run. -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: A World Beyond Capitalism 2005,
Ivan Van Laningham wrote: > And what defines a "python activist" anyway? Blowing up Perl > installations worldwide? +1 QOTW -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: Sorting part of a list
Fuzzyman wrote: > a = ll[2:] > a.sort() > ll[2:] = a > > To do a partial sort, in place, you'll have to subclass list Or be using 2.4: >>> ll = [3, 1, 4, 2] >>> ll[2:] = sorted(ll[2:]) >>> ll [3, 1, 2, 4] -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: help!
Eser Çetinkaya wrote:
> What can change an acess time of a path different from modification?
> Is there any mistakes in the implementation or am i missing some points?
When a file is read it is accessed but not modified:
>>> import os.path
>>> os.path.getmtime('a_file')
1119615705
>>> os.path.getatime('a_file')
1119615705
>>> os.system('cat a_file')
0
>>> os.path.getmtime('a_file')
1119615705
>>> os.path.getatime('a_file')
1119615758
--
Benji York
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Re: a dictionary from a list
David Bear wrote:
> Assume I have a list object called 'alist'.
>
> Is there an easy way to create a dictionary object with the members of
> 'alist' being the keys in the dictionary, and the value of the keys set to
> null?
You mean None, right? :)
>>> a_list = [1, 2, 3, 'a', 'b', 'c']
>>> dict.fromkeys(a_list)
{'a': None, 1: None, 2: None, 3: None, 'c': None, 'b': None}
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Benji York
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Re: http POST only returning GET data
vm wrote:
> Hi, for some reason my POST is not working properly.
Look at the URL again, you missed a character. You had:
httpSess.request("POST","/",params,headers)
It should be:
httpSess.request("POST","/q",params,headers)
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Benji York
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Re: Life of Python
Uwe Mayer wrote: > con: If you are planning larger applications (for a reasonable value of > "large") you have to discipline yourself to write well structured code. This is definitely true, no matter the language you use. > Then you will want to specify interfaces, If you're really interested in interfaces you might want to check out Zope3. Even if you don't want to use the "web" parts, the component architecture parts (interfaces, adapters, etc.) might be interesting to you. In a related vein is PEAK (http://peak.telecommunity.com/). It also has some related ideas about interfaces, components, adapters, etc. > accessor functions with different read /write access, ... I don't quite follow here. Are you talking about using a method like "thing.getX" instead of just accessing the attribute directly like "thing.x"? If so, that kind of up-front design isn't necessary in Python. > Unless you have designed the software interactions completely bevorehand > (which never works out) this is the only way to incorporate changes without > refactoring your source all the time. Refactoring *is* the way you handle not being able to "[design] the software interactions completely bevorehand". -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: unittest: collecting tests from many modules?
"Jorgen Grahn" wrote: >What's the best way of creating a test.py which >- aggregates the tests from all the test_*.py modules? You might want to check out the test runner in Zope 3 (svn://svn.zope.org/repos/main/Zope3/trunk/src/zope/app/testing) It aggregates test reporting, does code coverage, lets you select subsets of the tests to run, as well as control verbosity. And, if you feel experimental you might want to preview the new Zope test runner currently under development (svn://svn.zope.org/repos/main/zope.testing). -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: Better console for Windows?
Brett Hoerner wrote: > Is there a different shell I can use (other than cmd.com) to run Python > in, where I can full-screen the window (if I pleased), etc? As it is, > things that would run far off the right have to be word wrapped after > very few characters. To make the console full screen hit Alt-Enter. The same thing makes it windowed again. To accommodate very long lines click the "C:\" icon in the upper left corner of the window, choose "Properties" and then change the "Screen Buffer Size" Width and Height to something more to your liking. While you're there I'd recommend turning on "QuickEdit Mode" on the "Options" tab. Then you can drag with your left mouse button to select an area of text, right click to copy, then right click again to paste. -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: Inheriting from object
Fuzzyman wrote: > Also, can anyone explain any tangible benefit of inheriting from > object, when not explicitly using any features of new style classes ? One reason is that properties won't work correctly. -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: Favorite non-python language trick?
Terry Hancock wrote: > http://www.logilab.org/projects/python-logic/ > This is something pretty new to me, so I can't comment on how well > it would meet your expectations, but I see now that the site does mention > OZ/Mozart as comparables. I've used both, the logilab stuff is cool, but no where near the maturity (or speed) of OZ/Mozart. OTOH, I can actually get things done with the logilab code. But that might say more about me than Mozart. :) -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: When someone from Britain speaks, Americans hear a "British accent"...
Graham Fawcett wrote: > keep-your-stick-on-the-ice'ly yours, Is that a Red Green reference? Man, I didn't think this could get any more off-topic. :) python-needs-more-duct-tape'ly yours, Benji -- http://mail.python.org/mailman/listinfo/python-list
Re: I have a question.
Nathan Pinno wrote: > Does Python have a random function? If so, can you show me an example > using it? http://docs.python.org/lib/module-random.html -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: Python exception hook simple example needed
[EMAIL PROTECTED] wrote: > If anyone has an idea, how to I catch exceptions globally, please write me. I believe there is an example of this in the demo that comes with wxPython (don't have an install handy to check). -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: Considering moving from Delphi to Python [Some questions]
Dark Cowherd wrote: > I want some feedback on folllwing: > anybody who has experience in writing [...] data > entry heavy web applications. > Any suggestions? You might be interested in Zope 3's ability to generate data entry/edit forms via schemas. -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: Folding in vim
Sybren Stuvel wrote: > I always use one tab for indents, and set my editor to display it as > four spaces. I like being able to unindent a line by deleting a single > character. Your editor probably supports a "backspace unindents" option. If using Vim it would be something like "set softtabstop=4". -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: Use cases for del
Stian Søiland wrote: > Yes, and we can make > > someunknownlist[] = 2 > > magically do someunknownlist = list() and append 2. I hope you're being sarcastic. :) If not, why don't you like: some_list = [2] -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: map/filter/reduce/lambda opinions and background unscientific mini-survey
Ron Adam wrote: > "if extraargs:" would evaluate to "if None:", which would evaluate to > "if:" which would give you an error. In what way is "if None:" equivalent to "if:"? -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: ANN: python-constraint 1.0
Gustavo Niemeyer wrote: > **python-constraint** [1]_ is a Python module offering solvers for > Constraint Solving Problems (CSPs) over finite domains in simple > and pure Python. Very cool! I can't wait to get some time to play with this. -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: Managment of Python Libraries
Joseph Chase wrote: > In the past, I have noticed that I have spent a lot of time managing my C++ > libraries. The main thing you need are good tests. -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Fredericksburg, VA ZPUG Meeting
When: July 13, 7:30-9:00 PM Where: Zope Corp offices (513 Prince Edward Street; Fredericksburg, VA 22408) Details at http://www.zope.org/Members/poster/fxbgzpug_announce_2 Hope to see you there! -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: How do I send keystrokes to a console window in Windows XP?
[EMAIL PROTECTED] wrote:
> How do I use Python to send keystrokes to a console window in Windows
> XP?
import win32com.client
shell = win32com.client.Dispatch("WScript.Shell")
shell.AppActivate("Command Prompt")
shell.SendKeys("cls{ENTER}")
shell.SendKeys("dir{ENTER}")
shell.SendKeys("echo Hi There{ENTER}")
--
Benji York
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Re: email format in python
[EMAIL PROTECTED] wrote:
> I want to have the python equivalent function of this
> (that checks email format)
>
> function CheckEmail($Email = "") {
> if (ereg("[[:alnum:[EMAIL PROTECTED]:alnum:]]+\.[[:alnum:]]+",
> $Email)) {
> return true;
> } else {
> return false;
> }
> }
While it is possible to translate the above code into Python (see
http://docs.python.org/lib/module-re.html), you should know that the
regex above will not validate all possible email addresses. In general
it is a fools errand to try to anyway.
--
Benji York
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Re: How do I send keystrokes to a console window in Windows XP?
[EMAIL PROTECTED] wrote: > This gives me hope, but what I really need to do is to send keystrokes > to an <<>> console window. That's exactly what the code does. Try it out, you'll see how it works quickly enough. -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: Windows command line problem
MarkE wrote: > The answer appears to be: > An example command line for running the script was written in a word > document. The "Autocorrect" (sic) feature in word replaces a normal > dash There is a lesson there I wish more people would learn: Word is not a text editor. :) -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: Windows command line problem
[EMAIL PROTECTED] wrote: > I think the lesson there is 'dont depend on getopt, write your own > command line parser'. I always write my own, as it's so easy to do. While I'll agree that getopt isn't ideal, I find optparse to be much better. -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: Difference between " and '
Steven D'Aprano wrote:
> Michael Hoffman wrote:
>>John Machin wrote:
>>>[EMAIL PROTECTED] wrote:
>>>>Can someone tell me the difference between single quote and double
>>>>quote?
>>> >>> ord("'") - ord('"')
>>>5
>>Very zen.
> But unfortunately incorrect, since the original poster
> didn't ask for the difference between the ordinal
> values of the single quote and double quote characters
Steven, your reply was one of the most subtle and hilarious things I've
read in a long time. Unfortunately I couldn't tell if it was
intentional or not. :)
--
Benji York
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Re: What is your favorite Python web framework?
Dark Cowherd wrote: > My applications would be data entry heavy. Think inventory and accounting > apps. > > Would going past the [Zope] learning curve allow me to write applications > like that. You might want to look at Zope 3, there are several niceties for automatically (or semi-automatically if you prefer) generating input forms, validating them, applying the results to an object, etc. -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: unit test nested functions
Raymond Hettinger wrote: > [Andy] >>How can you unit test nested functions? > For whitebox testing, you could make an inner function visible by > binding it to the enclosing function's attribute namespace. > >def f(x): >def g(y): > . . . >f.g = g# make g visible as an attribute of f >. . . Note that when using this technique, f.g will not be bound until after you call the function: >>> def f(x): ... def g(y): ... pass ... f.g = g ... >>> f >>> f.g Traceback (most recent call last): File "", line 1, in ? AttributeError: 'function' object has no attribute 'g' >>> f(1) >>> f.g -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: unit test nested functions
Raymond Hettinger wrote: > [Benji York] > >>Note that when using this technique, f.g will not be bound until after >>you call the function: > > > That is a feature, not a bug. The inner function isn't even created > until the outer function is run. I'm fully aware of that. I just didn't want the OP get bit by it. -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: How to run python script in background after i logout
Harlin Seritt wrote: > python script.py & > > It runs fine. When I log off ssh I notice that the script died when I > logged off. How do I make sure it stays running? As another reply stated, cron is probably what you really want, but to answer your question literally: you want the "nohup" command (short for "no hangup", as in the HUP signal). You would run it like so: nohup python script.py & see "man nohup" and "info coreutils nohup" for more info. -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: Fire event when variable is Set/Get
tharaka wrote: > You are in luck because Python has "Properties" just like .NET. > class C(object): > def getx(self): return self.__x > def setx(self, value): self.__x = value > def delx(self): del self.__x > x = property(getx, setx, delx, "I'm the 'x' property.") Just for those that might have tastes like mine; here's the pattern I've been using for this (in 2.4, obviously): class C(object): @apply def x(): doc = "I'm the 'x' property." def fget(self): return self.__x def fset(self, value): self.__x = value def fdel(self): del self.__x return property(**locals()) You can remove any of fget, fset, fdel, or doc without changing any other lines, and there are no "extra" entries in the class's name space. -- season-to-taste-ly yours, Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: regarding porting to windows.
prakash reghate wrote: > I am also working on *porting C PROGRAMS to windows from Linux *, but i > doesn't get any clue yet. > > I have some C - programs written on Linux & i have to port it on windows . This list is about Python, not C. If you have some C Python extensions you wish to port, I'm sure someone would be able to help, but they'll need better information about what your specific question is. Perhaps this would help: http://www.catb.org/~esr/faqs/smart-questions.html -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: Counting processors
Pauldoo wrote: > Is a way in python to obtain the total number of processors present in > the system? I don't know of a platform independent way. If you specify one or more platforms, I'm sure someone will be able to help. -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: Run batch files in Windows XP
Ernesto wrote:
> Looks like I'm not getting my parameters to my batch file correctly.
> I'm using os.system like this:
> os.system('bootmanager.bat %s' %"BOOTMANAGER ALL")
>
> where 'BOOTMANAGER ALL' is what I type at the command prompt arguments.
> That must not be right?
The batch file will see two parameters (in %1 and %2) if that's not what
you want, put double quotes around the %s, like so:
os.system('bootmanager.bat "%s"' % "BOOTMANAGER ALL")
--
Benji York
--
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Re: Emacs skeletons
Michael Hoffman wrote: > I have this in my .emacs: > > (global-set-key "\M-/" 'hippie-expand) > > This means that M-/ will do dumb code completion based on stuff that is > already in an open buffer Even though I don't know how to configure Emacs to do it (I'm a degenerate Vim user), I've found ctags completion very handy. I currently have my (inferior) editor set up to scan the current buffer, other buffers, then tags files when doing completion. I'm sure (the superior) Emacs can do something similar. -- self-editor-abasing-ly y'rs, Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: Need to understand python license
Roy Smith wrote: > Specifically, can we take the Python interpreter source code, modify > it, compile it, staticly link it into our binaries, ship it to our > paying customers, and still retain the right to not show anybody our > source? See http://wiki.python.org/moin/PythonSoftwareFoundationLicenseFaq -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: Hiding
Steven Bethard wrote:
> So open("C:\file.txt") is still fine
I think it is more like it is recommended, not just OK.
--
Benji York
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Re: Thaughts from an (almost) Lurker.
Paddy wrote: > Sometimes when reading c.l.p. I mentally stand off from what I have > been reading and get an odd feeling that 'WE ARE BEING TESTED'. That > someone else is purposefully posting a near repetitive post, or obvious > flame bait etc - not for the usual reasons, but to track the dynamics > af the replies. "Never attribute to malice that which can be adequately explained by stupidity." -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: Dabo in 30 seconds?
Cliff Wells wrote: > As I mentioned earlier, programming is half brains and half > tenacity. +1 QOTY (quote of the year) -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: Is this Pythonic?
phil hunt wrote: > Suppose I'm writing an abstract superclass which will have some > concrete subclasses. I want to signal in my code that the subclasses > will implement certan methods. Is this a Pythonic way of doing what See http://docs.python.org/lib/module-exceptions.html#l2h-298 (NotImplementedError) -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: Python IDE's
Jon Hewer wrote: > But, if i use Vi, then whenever i want to test some code i have to > open up python, import the necessary modules and run it - I like the > idea of developing python in an IDE and just hitting a run button. map :w:!python % -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: a pickle's pickle
[EMAIL PROTECTED] wrote:
> So basically trainer always gets an existing TrainingMatrix(the class)
> pickled object if there is a file to read from, otherwise it just makes
> a new instance. Either way, the instance trainer is pickled at the end.
Right, but the data you're interested in is contained in the class, not
the instance. You need to move the mutable class attributes into the
instance. Like so:
class TrainingMatrix:
totalWordsProcessed = 0
numWords = 0
numContexts = 0
matrixWords = 0
def __init__(self):
self.matrix = []
self.estimator = {}
self.wordInfo = {}
self.contextInfo = {}
--
Benji York
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Fredericksburg, VA Zope and Python User Group
Please join us August 10, 7:30-9:00 PM, for the third meeting of the
Fredericksburg, VA Zope and Python User Group ("ZPUG").
This meeting has four features of note.
- Brian Lloyd, the author of Python for .Net (http://www.zope.org/
Members/Brian/PythonNet/) and the Zope Corporation VP of Engineering,
will discuss his .Net platform and give a brief .Net overview.
- Benji York, Zope Corp Senior Software Engineer, will discuss
current functional testing practices on Zope 3, including using
Selenium on Zope 3, using demo storage for functional testing, and
using his own compelling new functional test package. Note that the
majority of this discussion has strong applicability to automated
testing of all web frameworks and applications.
- We will serve the now-usual geek-chic fruit, cheese, and soft drinks.
- Fred Drake, Zope Corp Senior Software Engineer, Python core
developer, Python documentation maintainer and editor, and co-author
of the O'Reilly book Python & XML will give two of his books (http://
www.amazon.com/exec/obidos/tg/detail/-/0596001282/) to new
attendees. Upon pressure, he admitted that he would be willing to
autograph them if bribed with fruit, cheese, and soft drinks.
Note that we are eager to have non-Zope-Corporation employees give
presentations. :-)
We had three new attendees last meeting, for a total of ten. Please
come and bring friends!
More information http://www.zope.org/Members/poster/
fxbgzpug_announce_3 and below.
Hope to see you there!
Gary
General ZPUG information
When: second Wednesday of every month, 7:30-9:00.
Where: Zope Corporation offices. 513 Prince Edward Street;
Fredericksburg, VA 22408 (tinyurl for map is http://tinyurl.com/duoab).
Parking: Zope Corporation parking lot; entrance on Prince Edward Street.
Topics: As desired (and offered) by participants, within the
constraints of having to do with Python.
Contact: Gary Poster ([EMAIL PROTECTED])
--
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Re: Python IDE's
Adriaan Renting wrote: > vi/vim is a godssend if you need a working system that needs to fit in 4 > Mb or ROM, but it's an editor not an IDE. > When talking about IDE's I mean a lot more as 'just' an editor, below is > my 'wishlist', I would be very interested what solutions you use, how > much time it took you to set up this solution, and which parts of my > 'wishlist' it implements. First, a disclaimer: your point of "how much time it took you to set up?" is definitely valid. I would assert that it is also valid to ask "how much time did it save you once it was set up to work precisely the way you wanted it to?" > - Integrated help. > - Code completion. > - Integrated debugger. I've seen (but not used, because I don't want these features) Vim scripts to do these. They exist for Emacs too. > - Integrated GUI design. > The IDE should have a graphical tool for designing GUIs, and the editor > should be aware of it and propagate changes in an inobtrusive way. Not in Vim (or Emacs), but the best GUI designers /I've/ seen are stand-alone anyway. In other words, their not in an IDE either. > - Code aware editor. > - Integration with version control system. > - Code documentation/inspection tools. I use Vim for these. > Ability to generate include and inheritance trees On the rare occasions I do something like this it's with apidoc. > LOC counters I use sloccount (outside of Vim). > profiling what lines of you code get executed most/never I use a testing framework or profiler for that (outside of Vim) > helpfile generation from code, etc. I don't do that, but if I did, it would probably be outside of Vim. > Tools for communication with coworkers Gaim and Thunderbird > bugtracking Zope collector and Roundup > which targets need which files, automatic install scripts/tools, > etc. (If I understand you correctly) I use a tool we developed internally to do this. > - Accessible user interface. > All functionality should be accessible through some menu structure, so I > don't need to depend on my memory. Prefereable reprogrammable/assignable > shortcut keys for all functionality, maybe even some form of macros, > plugins, etc. Vim (and Emacs) does this (there are a few non-menu accessible things, but they can be added to menus as you please). > - For C/C++: > memory leak detection External tools. > Why I want this? Because I want to spend my time programming my > code, not my developement environment. Why would I spend the time setting this up? Because I want to spend my time programming my code, not fighting my development environment. :) I wonder why you would want some of these things integrated into an IDE (communication, LOC counter, etc.) -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: trying to parse non valid html documents with HTMLParser
florent wrote: > I'm trying to parse html documents from the web, using the HTMLParser > class of the HTMLParser module (python 2.3), but some web documents are > not fully valids. From http://www.crummy.com/software/BeautifulSoup/: You didn't write that awful page. You're just trying to get some data out of it. Right now, you don't really care what HTML is supposed to look like. Neither does this parser. -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: trying to parse non valid html documents with HTMLParser
florent wrote: > True, I just want to extract some data from html documents. But the > problem is the same. The parser looses the position he was in the string > when he encounters a bad tag. Are you saying that Beautiful Soup can't parse the HTML? If so, I'm sure the author would like an example so he can "fix" it. -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: Parallel port programming on windows XP/2000?
Novice Experl wrote: > I'd like to write a simple application that interfaces with the parallel port Use pyParallel. You don't have to worry about the Java stuff unless you're using Jython. Just follow the instructions on the page (download, unarchive, python setup.py install). After that you have to understand how the parallel port works, but I'll assume you already do or can use the web to figure it out. -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: In-place decorate-sort-undecorate - best implementation?
Tom Anderson wrote: > I don't have python 2.4; anyone care to check how they compare there? I > used the following timer function: I think on 2.4 the new "key" option to list.sort would be the fastest way to accomplish what you want. -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: The ONLY thing that prevents me from using Python
Kevin wrote: > I have been using java (jsp/servlets), vb/asp and perl for a few years. > Almost all my projects are web site development related, and many of my > clients' web sites are hosted on those shared web hosting services. > > The problem is that it's difficult to find hosting services with Python > installed and supported. See http://wiki.python.org/moin/PythonHosting and remember that Google is your friend. -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: python for microcontrollers
Evil Bastard wrote: > I'm currently tackling the problem of implementing a python to assembler > compiler for PIC 18Fxxx microcontrollers Perhaps porting Pyrex would be easier. Pyrex takes a python-like syntax (plus type information, etc.) and emits C, which is then compiled. -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: Point and click GUI builder for Python
Madhusudan Singh wrote: > Is there such a thing for python ? Like Qt Designer for instance ? I've had great success with wxDesigner (http://www.roebling.de/). It is a commercial product ($129 for a single license), but it does an exceptional job. -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: [Python-Dev] implementation of copy standard lib
Simon Brunning wrote: > I think that copy is very rarely used. I don't think I've ever imported it. > > Or is it just me? I rarely use copy, and almost always regret it when I do. -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: Testing for presence of arguments
Madhusudan Singh wrote: > I know how to set optional arguments in the function definition. Is there an > intrinsic function that determines if a certain argument was actually > passed ? Like the fortran 95 present() logical intrinsic ? People generally use a value that isn't a valid option, often None. def my_func(a, b, c=None): if c is None: do something If None is a valid value, make one that isn't: unspecified = object() def my_func(a, b, c=unspecified): if c is unspecified: do something -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: creating/modifying sparse files on linux
Terry Reedy wrote: > megastring = 100*'a' # t < 1 sec on my machine >>(other than keep appending to a string until it reaches 1MB len)? > > You mean like (unexecuted) > s = '' > for i in xrange(100): s += 'a' #? > > This will allocate, copy, and deallocate 100 successively longer > temporary strings and is a noticeable O(n**2) operation. Not exactly. CPython 2.4 added an optimization of "+=" for strings. The for loop above takes about 1 second do execute on my machine. You are correct in that it will take *much* longer on 2.3. -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: How to get a unique id for bound methods?
Russell E. Owen wrote: > The id of two different methods of the same object seems to be the > same, and it may not be stable either. Two facts you're (apparently) unaware of are conspiring against you: 1) the "id" of an object is consistent for the lifetime of the object, but may be reused after the object goes away 2) methods are bound on an as-needed basis and then normally discarded (unless you do something to keep them around) An illustration: class cls(object): def meth1(self): pass def meth2(self): pass c = cls() m1 = c.meth1 print id(m1) -1209779308 m2 = c.meth1 print id(m2) -1209652732 > I guess that just means bound methods aren't objects in their own right, > but it surprised me. Nope, they're objects, they just don't tend to be around very long. > The "hash" function looks promising -- it prints out consistent values > if I use it instead of "id" in the code above. Is it stable and unique? > The documentation talks about "objects" again, which given the behavior > of id makes me pretty nervous. > > Any advice would be much appreciated. I think you'll get the best advice from this group if you tell us what the larger problem is that you're trying to solve. -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: Sanitizing untrusted code for eval()
Jim Washington wrote: > I'm still working on yet another parser for JSON (http://json.org). Hi, Jim. > The only problem is, it uses eval(). It's important to sanitize the > incoming untrusted code before sending it to eval(). > Does anyone know of any other "gotchas" with eval() I have not found? Or > is eval() simply too evil? I'd say that eval is just too evil. I do wonder if it would be possible to use eval by working from the other direction. Instead of trying to filter out dangerous things, only allow a *very* strict set of things in. For example, since your doing JSON, you don't even need to allow multiplication. If you only allowed dictionaries with string keys and a restricted set of types as values, you'd be pretty close. But once you're at that point you might as well use your own parser and not use eval at all. -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
