Re: JSON translated into SQL by python
Aaron G. writes:
> I am new to programming python for JSON to SQL and I was wondering
> why this does not work. All the values for entering the DB are
> correct. The EnterpriseValue data is not entering the database.
>
> #collect data from JSON source at Yahoo
> url = ["db", "http://y.ahoo.it/wlB89";]
> #check all sites
> checkstatus(url[]);
> #retrieve EnterpriseValue data from yahoo to DB
> url = "http://y.ahoo.it/wlB89";
> data = helper.openJSON_URL(url)
> #store data
> curObservation = data["EnterpriseValue"]
>
> #connect to amazon and post data from Yahoo
> conn = inti_psql_amazon("db name", "db user", "password", "db source")
> query = "CREATE TABLE temp2 (ID int NOT NULL AUTO_INCREMENT, Enterprise_Value
> float, PRIMARY KEY(ID));"
> query = "INSERT INTO TABLE temp2 (enterprise) VALUES("+ str(curObservation)
> +");"
> do_query_amazon(conn, query)
> close_psql_amazon(conn)
Possibly you should let the database know about the first query. Now
it's just a very short-lived string in the Python program.
Is there no exception?
My inclination would be to go to the Python interpreter and try very
simple interactions with the database. Create a table with only one
column. Insert one value. See if the value is there. Hello, world.
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Behavior of staticmethod in Python 3
In Python 3 the following two classes should be equivalent: $ cat foo.py class Foo: def foo(): pass print(callable(foo)) class Foo: @staticmethod def foo(): pass print(callable(foo)) But they do not: $ python3 foo.py True False How come the metaclass does not skip the staticmethod decorator? -- Marco Buttu -- https://mail.python.org/mailman/listinfo/python-list
Re: JSON translated into SQL by python
Aaron G. wrote:
> I am new to programming python for JSON to SQL and I was wondering why
> this does not work. All the values for entering the DB are correct. The
> EnterpriseValue data is not entering the database.
> #collect data from JSON source at Yahoo
> url = ["db", "http://y.ahoo.it/wlB89";]
> #check all sites
> checkstatus(url[]);
> #retrieve EnterpriseValue data from yahoo to DB
> url = "http://y.ahoo.it/wlB89";
> data = helper.openJSON_URL(url)
> #store data
> curObservation = data["EnterpriseValue"]
>
> #connect to amazon and post data from Yahoo
> conn = inti_psql_amazon("db name", "db user", "password", "db source")
inti_psql_amazon? Please post your actual code. Cut and paste, don't retype.
If there's an exception, post that, too. The source code of
do_query_amazon()
might be interesting, too. A commit() on the db cursor might do wonders.
> query = "CREATE TABLE temp2 (ID int NOT NULL AUTO_INCREMENT,
Enterprise_Value float, PRIMARY KEY(ID));"
> query = "INSERT INTO TABLE temp2 (enterprise) VALUES("+
str(curObservation) +");"
As a general remark, don't build your queries like that, rely on the API to
insert the values. E. g.:
cursor = conn.cursor()
cursor.execute("insert into table temp2 (enterprise) values (?);",
(curObservation,))
(Some databases use '%s' instead of '?')
> do_query_amazon(conn, query)
> close_psql_amazon(conn)
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Re: Behavior of staticmethod in Python 3
Marco Buttu wrote: > In Python 3 the following two classes should be equivalent: Says who? > $ cat foo.py > class Foo: > def foo(): > pass > print(callable(foo)) > > class Foo: > @staticmethod > def foo(): > pass > print(callable(foo)) > > But they do not: > > $ python3 foo.py > True > False > > How come the metaclass does not skip the staticmethod decorator? What? Your print()s are executed inside the class body, so the classes don't come into play at all. Your script is saying that a staticmethod instance is not a callable object. It need not be because Foo.foo() doesn't call the Foo.foo attribute directly, it calls Foo.foo.__get__(None, Foo)() >>> class D: ... def __get__(self, *args): print(args) ... >>> class Foo: ... foo = D() ... >>> Foo.foo() (None, ) Traceback (most recent call last): File "", line 1, in TypeError: 'NoneType' object is not callable Look for "descriptor protocol" to learn the details. -- https://mail.python.org/mailman/listinfo/python-list
Simple TCP message framework
Seems like the following pattern must be very common, solved a million times, but I can't seem to find anything this simple and ready to use. Basically I just want a simple python messaging layer that hides some of the messiness of the underlying sockets and user authentication. It would be asyncore under the hood of course. Perhaps what I am looking for is hiding in plain sight, but there are so many asynchronous communication tools out there, it's hard to thumb through them all. So I'm not looking for such a list of toolkits to browse through. Just something simple that does the equivalent of the following: Server: on_open(user) - called when a user logs in on_close(user) - called when a user disconnects on_recv(user, s) - called when a user sends a message send(user, s) - send a message to a user Client: open(host, user, password) - open an authenticated session with the host close() - disconnect send(s) - send a message to the server on_recv(s): called when a message is received from the server Methods starting with "on_" are callbacks intended to be implemented by derived classes. Messages are atomic and delimited by '\n'. So concatenation of buffered messages is hidden. A message is received when complete (i.e. terminated with '\n'). Also, each message should be implicitly flushed, so that it will be received in a timely manner in the absence of additional messages. Extra bonus for a compatible javascript implementation of the Client as well, so it can run in a browser. Thanks in advance for any thoughts. - Padawan -- https://mail.python.org/mailman/listinfo/python-list
Re: Behavior of staticmethod in Python 3
On 11/23/2013 10:01 AM, Peter Otten wrote:
In Python 3 the following two classes should be equivalent:
Says who?
>$ cat foo.py
>class Foo:
> def foo():
> pass
> print(callable(foo))
>
>class Foo:
> @staticmethod
> def foo():
> pass
> print(callable(foo))
>
>But they do not:
>
>$ python3 foo.py
>True
>False
Your script is saying that a staticmethod instance is not a callable object.
It need not be because
Foo.foo()
Yes, you are right about Python 3. But in Python 2, if I am not going
wrong, there is not solution, and I need to define a function outside
the class. For instance:
$ cat config.py
class Configuration(object):
def positiveCheck(value):
if not value > 0:
raise AttributeError('Must be a positive number')
attributes = {
# Attribute name: (type, checkrule)
'myattr': (int, positiveCheck),
}
def __setattr__(self, name, value):
if not name in Configuration.attributes:
raise AttributeError("Attribute `%s` non allowed." %name)
expected_type, checkrule = Configuration.attributes[name]
if not isinstance(value, expected_type):
raise TypeError('The value %s is not of type %s' \
%(value, expected_type.__name__))
if callable(checkrule):
print('calling %s(%s)' %(checkrule.__name__, value))
checkrule(value)
super(Configuration, self).__setattr__(name, value)
The positive check works fine:
>>> from config import Configuration
>>> c = Configuration()
>>> c.myattr = -10
calling positiveCheck(-10)
Traceback (most recent call last):
...
AttributeError: Must be a positive number
But I cannot use the method as a function:
>>> Configuration.positiveCheck(-10)
Traceback (most recent call last):
...
Configuration instance as first argument (got int instance instead).
Furthemore, I cannot use the method as a staticmethod, becase otherwise
it will not be callable inside the class body.
--
Marco Buttu
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Showing Progress Bar
I want to show simple dots while my program copies the files. I have found the code like: for i in range(10): print '.', time.sleep(1) But this will execute ten times as it is predefined and the task to copy will execute after or before this loop based on the location I have placed my line to copy the files using shutil.copy(). I want that the files should be copied and in parallel the progress should be shown and when the files are copied, the progress should exit. -- https://mail.python.org/mailman/listinfo/python-list
Re: Showing Progress Bar
On Saturday, November 23, 2013 6:36:28 AM UTC-5, Himanshu Garg wrote:
> I want to show simple dots while my program copies the files. I have found
> the code like:
>
> for i in range(10):
> print '.',
> time.sleep(1)
>
> But this will execute ten times as it is predefined and the task to copy will
> execute after or before this loop based on the location I have placed my line
> to copy the files using shutil.copy().
>
> I want that the files should be copied and in parallel the progress should be
> shown and when the files are copied, the progress should exit.
Stdout is buffered, meaning it will wait for a newline, or for some large
amount of output, before actually outputting the characters to the screen. Use
the flush method to force it to be output now. Writing to sys.stdout directly
also lets you avoid the space that a print-comma gives you:
for i in range(10):
sys.stdout.write(".")
sys.stdout.flush()
time.sleep(1)
sys.stdout.write("\n")
--Ned.
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Re: Showing Progress Bar
for i in range(10):
sys.stdout.write(".")
sys.stdout.flush()
time.sleep(1)
sys.stdout.write("\n")
shutil.copytree("pack", "/lxc/pack")
But Here, the loop will first print the progress dots and then it will copy the
directory. But I want that these two tasks should run simultaneously.
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Re: Showing Progress Bar
"Himanshu Garg" wrote in message
news:b4b7cf70-07fa-455a-b01f-cb69b9402...@googlegroups.com...
>I want to show simple dots while my program copies the files. I have found
>the code like:
>
> for i in range(10):
>print '.',
>time.sleep(1)
>
> But this will execute ten times as it is predefined and the task to copy
> will execute after or before this loop based on the location I have placed
> my line to copy the files using shutil.copy().
>
> I want that the files should be copied and in parallel the progress should
> be shown and when the files are copied, the progress should exit.
Ned has shown how to view the dots as they are printed, but has not
addressed the 'parallel' aspect.
Here is one approach, which uses the threading module to print the dots in a
separate thread while the main thread does the copying.
import sys
import threading
class ProgressBar(threading.Thread):
"""
In a separate thread, print dots to the screen until terminated.
"""
def __init__(self):
threading.Thread.__init__(self)
self.event = threading.Event()
def run(self):
event = self.event # make local
while not event.is_set():
sys.stdout.write(".")
sys.stdout.flush()
event.wait(1) # pause for 1 second
sys.stdout.write("\n")
def stop(self):
self.event.set()
Before starting the copy -
progress_bar = ProgressBar()
progress_bar.start()
When the copy is finished -
progress_bar.stop()
progress_bar.join()
HTH
Frank Millman
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Re: Showing Progress Bar
Thanks a lot Frank! Its superb. I got what I wanted. Thanks Again! -- https://mail.python.org/mailman/listinfo/python-list
Re: Showing Progress Bar
On Sat, Nov 23, 2013 at 11:11 PM, Frank Millman wrote: > class ProgressBar(threading.Thread): > """ > In a separate thread, print dots to the screen until terminated. > """ It's worth noting that this, as coded, is not a progress bar but merely an activity bar. The number of dots printed depends on the time taken and not on the amount of "stuff" done. For a true progress bar, you'd have to manage something through the copy process itself - figure out how much there is to copy, figure out how many dots to display in total (probably a fixed number, eg 50), then output a dot every X bytes or files copied, based on that proportion. This is a lot simpler, of course! ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: Help me to print to screen as well as log
How can I write to the same file from two different scripts opened at same time? -- https://mail.python.org/mailman/listinfo/python-list
sys.stdout and Python3
Hi all
I have a question arising from another thread, but on a different topic,
hence the new thread.
Under Python2, if you want to print a series of dots to the screen without a
newline, you can do the following:
for i in range(10):
sys.stdout.write('.')
sys.stdout.flush()
time.sleep(1)
sys.stdout.write('\n')
I tried it under Python3, and found that it differs in two ways -
1. Each 'write' is terminated by a newline
2. Each 'write' appends the length of the string written.
So instead of -
..
I get -
.1
.1
etc
I found that the new 'print' function has a 'flush' argument, so it can now
be written as -
for i in range(10):
print('.', end='', flush=False)
time.sleep(1)
print()
I tried to read the docs on sys.stdout, and I see a lot of changes in this
area, but I could not see the reason for the above behaviour.
Is there a way to reproduce the Python2 behaviour in Python3 using
sys.stdout?
Thanks
Frank Millman
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Question about import hooks
Hi all, I am the author of the ``future`` package for Python 2/3 compatibility (http://python-future.org). A bug report has recently been posted about its use of import hooks that I don't yet have an answer for, and I am looking for some guidance on how to customize the import mechanism in a safer way. The current interface is as follows: >>> from future import standard_library Any subsequent import statements using Python 3-style module names are mapped onto the relevant Python 2-style names (or, where needed, backported modules provided by ``future``). For example, these then work in the same way on both Python 2 and Python 3: >>> from http.client import HttpConnection >>> import html.parser >>> import queue >>> import configparser Although this is a nice interface, reminiscent of ``from __future__ import ...``, the problem is that the current implementation, which appends finder objects to the ``sys.meta_path`` list (http://docs.python.org/2/library/sys.html#sys.meta_path) renders the import hooks globally, even for modules imported by other modules. What I want instead is for the import hooks to apply only to a particular module, so that a script containing: from future import standard_library import requests would not apply the import hooks to modules imported within the ``requests`` module, merely to import statements in the script itself. There is a note in the Python 3.3 documentation (and the current Python 3.4 draft) that I had hoped would provide the answer for how to implement this: "When calling __import__() (http://docs.python.org/3/library/functions.html#__import__) as part of an import statement, the import system first checks the module global namespace for a function by that name. If it is not found, then the standard builtin __import__() (http://docs.python.org/3/library/functions.html#__import__) is called." If this were true, it would be possible to change the interface to something like this: >>> from future.standard_library import __import__ which would then override the ``__import__`` function in ``builtins`` or ``__builtin__`` affecting subsequent ``import`` statements only in that module. The interface wouldn't be quite as nice, but it wouldn't cause the import hooks to bleed into other modules that don't need them. However, the docs seem to be wrong; defining __import__ as a global seems to have no effect on imports in Py3.3, and ``future`` needs to implement this for Python 2 anyway. Can you think of a way to implement import hooks safely, for one particular module, while providing a nice clean interface? Preferably this would remain accessible through a one-line import like ``from future import standard_library``. Thanks in advance for any ideas! Best wishes, Ed -- Dr. Edward Schofield (M) +61 (0)405 676 229 Python Charmers http://pythoncharmers.com -- https://mail.python.org/mailman/listinfo/python-list
Re: Behavior of staticmethod in Python 3
On Sat, 23 Nov 2013 09:28:43 +0100, Marco Buttu wrote: > In Python 3 the following two classes should be equivalent: They certainly are not equivalent in *any* version of Python, because staticmethods are not equivalent to instance methods. > $ cat foo.py > class Foo: > def foo(): > pass > print(callable(foo)) > > class Foo: > @staticmethod > def foo(): > pass > print(callable(foo)) > > But they do not: > > $ python3 foo.py > True > False And Python 2 gives the same result for staticmethods: [steve@ando ~]$ python2.7 Python 2.7.2 (default, May 18 2012, 18:25:10) [GCC 4.1.2 20080704 (Red Hat 4.1.2-52)] on linux2 Type "help", "copyright", "credits" or "license" for more information. py> py> class Test(object): ... @staticmethod ... def method(): ... pass ... print callable(method) ... False > How come the metaclass does not skip the staticmethod decorator? What makes you think the metaclass gets the opportunity to skip the decorator? By the time the metaclass gets called, the decorator has already run. You seem to be conflating behaviour in Python 2 that doesn't actually occur. Staticmethods are not directly callable in any version of Python. The problem you seem to have is that you want to call a method both during and after construction: class MyClass(object): def helper(arg): return arg + 1 x = helper(10) y = helper(20) def method(self, arg): return self.helper(arg) Here, the attributes x and y rely on calling helper as a function, where it does not receive a self argument, but when calling helper from inside the instance method, or when calling it like MyClass.helper(), it will receive a self argument. Unfortunately there is no good solution to this using just built-ins. staticmethod doesn't work, as it's not callable. However, we can create our own callable version of staticmethod: class callable_staticmethod(object): def __init__(self, func): self.func = func def __get__(self, obj, cls=None): return self.func def __call__(self, *args, **kwargs): return self.func(*args, **kwargs) class MyClass(object): @callable_staticmethod def helper(arg): return arg + 1 x = helper(10) y = helper(20) def method(self, arg): return self.helper(arg) This should now work exactly as you hope. -- Steven -- https://mail.python.org/mailman/listinfo/python-list
Re: Got a Doubt ! Wanting for your Help ! Plz make it ASAP !
On Nov 23, 2013, at 1:42 AM, Ian Kelly wrote: > On Fri, Nov 22, 2013 at 7:18 PM, Steven D'Aprano > wrote: >> I'm not an expert on Indian English, but I understand that in that >> dialect it is grammatically correct to say "the codes", just as in UK and >> US English it is grammatically correct to say "the programs". > > I wouldn't necessarily even consider it an Indian thing, as I've known > Americans to use the same phrase. > Yes - when I arrived at a Department of Energy national laboratory in the late 1960s, code, to code, and coding were pretty much the accepted verb forms. To the best of my knowledge, the word program didn't start to creep in until later. I'm guessing, but I'd assume it started to arrive with the first computer science graduates. -Bill -- https://mail.python.org/mailman/listinfo/python-list
Re: sys.stdout and Python3
On Sun, Nov 24, 2013 at 12:26 AM, Frank Millman wrote:
> for i in range(10):
> sys.stdout.write('.')
> sys.stdout.flush()
> time.sleep(1)
> sys.stdout.write('\n')
>
> I tried it under Python3, and found that it differs in two ways -
>
> 1. Each 'write' is terminated by a newline
> 2. Each 'write' appends the length of the string written.
Only in the interactive interpreter, where return values get printed.
In a script, that won't happen. To prevent that from happening
interactively, just assign the result to something:
for i in range(10):
_=sys.stdout.write(".")
sys.stdout.flush()
There definitely is a difference between Py2 and Py3 there, but it's
nothing to do with sys.stdout - it's a change in the REPL (interactive
interpreter, Read/Eval/Print Loop) and how it handles return values
inside loops. I think it's an improvement, overall, though it is a
little confusing when you work with partial output.
ChrisA
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Re: Got a Doubt ! Wanting for your Help ! Plz make it ASAP !
On 23/11/2013 02:18, Steven D'Aprano wrote: In other words, in UK/US English, UK English? Clearly you've never been to Newcastle upon Tyne or Glasgow :) -- Python is the second best programming language in the world. But the best has yet to be invented. Christian Tismer Mark Lawrence -- https://mail.python.org/mailman/listinfo/python-list
Re: Question about import hooks
On 23/11/2013 12:23, Ed Schofield wrote: Hi all, I am the author of the ``future`` package for Python 2/3 compatibility (http://python-future.org). A bug report has recently been posted about its use of import hooks that I don't yet have an answer for, and I am looking for some guidance on how to customize the import mechanism in a safer way. The current interface is as follows: from future import standard_library Any subsequent import statements using Python 3-style module names are mapped onto the relevant Python 2-style names (or, where needed, backported modules provided by ``future``). For example, these then work in the same way on both Python 2 and Python 3: from http.client import HttpConnection import html.parser import queue import configparser Although this is a nice interface, reminiscent of ``from __future__ import ...``, the problem is that the current implementation, which appends finder objects to the ``sys.meta_path`` list (http://docs.python.org/2/library/sys.html#sys.meta_path) renders the import hooks globally, even for modules imported by other modules. What I want instead is for the import hooks to apply only to a particular module, so that a script containing: from future import standard_library import requests would not apply the import hooks to modules imported within the ``requests`` module, merely to import statements in the script itself. There is a note in the Python 3.3 documentation (and the current Python 3.4 draft) that I had hoped would provide the answer for how to implement this: "When calling __import__() (http://docs.python.org/3/library/functions.html#__import__) as part of an import statement, the import system first checks the module global namespace for a function by that name. If it is not found, then the standard builtin __import__() (http://docs.python.org/3/library/functions.html#__import__) is called." If this were true, it would be possible to change the interface to something like this: from future.standard_library import __import__ which would then override the ``__import__`` function in ``builtins`` or ``__builtin__`` affecting subsequent ``import`` statements only in that module. The interface wouldn't be quite as nice, but it wouldn't cause the import hooks to bleed into other modules that don't need them. However, the docs seem to be wrong; defining __import__ as a global seems to have no effect on imports in Py3.3, and ``future`` needs to implement this for Python 2 anyway. Can you think of a way to implement import hooks safely, for one particular module, while providing a nice clean interface? Preferably this would remain accessible through a one-line import like ``from future import standard_library``. Thanks in advance for any ideas! Best wishes, Ed I've no idea if this http://www.python.org/dev/peps/pep-0451/ is relevent to your needs but thought I'd point it out anyway. It has been implemented in Python 3.4 beta. -- Python is the second best programming language in the world. But the best has yet to be invented. Christian Tismer Mark Lawrence -- https://mail.python.org/mailman/listinfo/python-list
finding masking boundary indices
Hi, I have a masked array like in the attached link, I wanted to find indices of the bounds where the mask is false ie in this case of depth file where there is depth less than shore. Is there a pythonic way of finding the boundary indices? please advice? https://drive.google.com/file/d/0B3heUQNme7G5d2dYZzgxTG1NdG8/edit?usp=sharing -- https://mail.python.org/mailman/listinfo/python-list
Re: finding masking boundary indices
On Sun, Nov 24, 2013 at 1:29 AM, Sudheer Joseph wrote: > Hi, >I have a masked array like in the attached link, I wanted to find > indices of the bounds where the mask is false ie in this case of depth file > where there is depth less than shore. Is there a pythonic way of finding the > boundary indices? please advice? > https://drive.google.com/file/d/0B3heUQNme7G5d2dYZzgxTG1NdG8/edit?usp=sharing First piece of advice: Don't post a link that requires that you share the file with us :) We can't see what you've posted there. Actually, just don't post a link at all, for preference; include your code right here in the mail, that's the most effective. Also: Please don't use Google Groups. It makes your posts ugly in the archive, as the lines are not wrapped, and it has some abysmal practices with regard to replies/follow-ups. There are better news clients around; alternatively, you can read and post on the mailing list python-list@python.org, which carries the same content. Here's the mailing list: https://mail.python.org/mailman/listinfo/python-list Beyond that, I can't really advise, as I have no idea what your code is doing :) ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Using sh library with grep command
I'm trying to use sh (https://pypi.python.org/pypi/sh) for calling
system grep command but it's now working as expected.
An example:
import sh
sh.grep('abc', os.getcwd(), '-r')
But I get the ErrorReturnCode_1: exception, that I learned is the
normal exit code for grep command when it not found any match.
The error instance object reported that the command run is:
*** ErrorReturnCode_1:
RAN: '/usr/bin/grep abc /Users/keul/test_sh'
Obviously manually running the command I get some output and exit code 0.
Where I'm wrong?
--
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twitter: http://twitter.com/keul
linkedin: http://linkedin.com/in/lucafbb
blog: http://blog.keul.it/
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Re: Behavior of staticmethod in Python 3
Marco Buttu wrote:
> On 11/23/2013 10:01 AM, Peter Otten wrote:
>
>>> In Python 3 the following two classes should be equivalent:
>> Says who?
>>
>>> >$ cat foo.py
>>> >class Foo:
>>> > def foo():
>>> > pass
>>> > print(callable(foo))
>>> >
>>> >class Foo:
>>> > @staticmethod
>>> > def foo():
>>> > pass
>>> > print(callable(foo))
>>> >
>>> >But they do not:
>>> >
>>> >$ python3 foo.py
>>> >True
>>> >False
>>>
>>
>> Your script is saying that a staticmethod instance is not a callable
>> object. It need not be because
>>
>> Foo.foo()
>
> Yes, you are right about Python 3. But in Python 2, if I am not going
> wrong, there is not solution, and I need to define a function outside
> the class. For instance:
>
> $ cat config.py
> class Configuration(object):
>
> def positiveCheck(value):
> if not value > 0:
> raise AttributeError('Must be a positive number')
>
> attributes = {
> # Attribute name: (type, checkrule)
> 'myattr': (int, positiveCheck),
> }
Just add
positiveCheck = staticmethod(positiveCheck)
at this point and everything should work in both Python 2 and 3.
Alternatively use Steven's callable_staticmethod as a decorator.
>
> def __setattr__(self, name, value):
> if not name in Configuration.attributes:
> raise AttributeError("Attribute `%s` non allowed." %name)
>
> expected_type, checkrule = Configuration.attributes[name]
> if not isinstance(value, expected_type):
> raise TypeError('The value %s is not of type %s' \
> %(value, expected_type.__name__))
> if callable(checkrule):
> print('calling %s(%s)' %(checkrule.__name__, value))
> checkrule(value)
>
> super(Configuration, self).__setattr__(name, value)
>
> The positive check works fine:
>
> >>> from config import Configuration
> >>> c = Configuration()
> >>> c.myattr = -10
> calling positiveCheck(-10)
> Traceback (most recent call last):
> ...
> AttributeError: Must be a positive number
>
> But I cannot use the method as a function:
>
> >>> Configuration.positiveCheck(-10)
> Traceback (most recent call last):
> ...
> Configuration instance as first argument (got int instance instead).
>
> Furthemore, I cannot use the method as a staticmethod, becase otherwise
> it will not be callable inside the class body.
PS: AttributeErrors should be raised when an attribute does not exist or
cannot be set; I recommend that you raise a ValueError in positiveCheck().
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Re: Using sh library with grep command
In article ,
Luca wrote:
> I'm trying to use sh (https://pypi.python.org/pypi/sh) for calling
> system grep command but it's now working as expected.
>
> An example:
>
> import sh
> sh.grep('abc', os.getcwd(), '-r')
>
> But I get the ErrorReturnCode_1: exception, that I learned is the
> normal exit code for grep command when it not found any match.
>
> The error instance object reported that the command run is:
>
> *** ErrorReturnCode_1:
> RAN: '/usr/bin/grep abc /Users/keul/test_sh'
>
> Obviously manually running the command I get some output and exit code 0.
>
> Where I'm wrong?
I'm not an expert on the sh module. I took a quick look at the docs for
it and didn't find anything about debugging or logging, but if there was
something I missed which allows you to log what it's doing in greater
detail, the first thing I would do is turn that on.
Here's some things I would try.
First, do:
dir = os.getcwd()
print dir
then pass dir as the second argument to grep(). It's one less variable
in the equation. Maybe os.getcwd() isn't returning what you think it
is. Not terribly likely, but easy to check, so eliminate that.
Next, try a simpler command. Don't grep a whole directory, grep a
single file. Try:
sh.grep('abc', '/tmp/my-test-file')
and see what happens. Get a simple case to work, then try the more
complicated stuff.
Lastly, you might try pulling out the big guns. Trace your entire
process, with something like truss or strace (the details will be very
system-dependent). At some point, you're going to see your Python
process do a fork/exec sequence on /bin/grep (or, perhaps, some other
version of grep elsewhere in your path). At that point, you'll know
exactly what it ran, with what arguments.
Also, it helps when asking questions like this to tell us about your
environment. What version of Python are you running. What version of
the sh module did you download. What operating system (I'm guessing
OSX, just because of how /User/keul is capitalized).
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Re: Method chaining
OK, that one is disgusting... Anyway, I'd like to see a sequence of method names taken from actual code that profits from this chaining pattern. Actually, wx.lib.agw uses this a lot. Especially for AuiPaneInfo: http://www.wxpython.org/docs/api/wx.aui.AuiPaneInfo-class.html All right, this is a C++ proxy. But still, it is actively used by many. -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. -- https://mail.python.org/mailman/listinfo/python-list
Re: run command line on Windows without showing DOS console window
在 2013年11月20日星期三UTC+8下午10时49分50秒，Tim Golden写道： > On 20/11/2013 14:44, iMath wrote: > > > > > > > > > is there anyway to run command line on Windows without showing DOS console > > window ? > > > > > > can you use the following command line to give a little example ? > > > > > > wget -r -np -nd http://example.com/packages/ > > > > > > the path to wget is C:\Program Files\GnuWin32\bin\wget.exe > > > > > > > subprocess.call(["wget", "-r", "-np", "-nd", "http://example.com";]) > > > > TJG Have you tried it ? the DOS console window still pops up? but I found when shell=True ,the DOS console window doesn't pop up,anyone can explain why ? -- https://mail.python.org/mailman/listinfo/python-list
Re: Using sh library with grep command
Luca wrote:
> I'm trying to use sh (https://pypi.python.org/pypi/sh) for calling
> system grep command but it's now working as expected.
>
> An example:
>
> import sh
> sh.grep('abc', os.getcwd(), '-r')
>
> But I get the ErrorReturnCode_1: exception, that I learned is the
> normal exit code for grep command when it not found any match.
>
> The error instance object reported that the command run is:
>
> *** ErrorReturnCode_1:
> RAN: '/usr/bin/grep abc /Users/keul/test_sh'
>
> Obviously manually running the command I get some output and exit code 0.
>
> Where I'm wrong?
Did you run grep with or without the -r option?
The code sample and the error message don't match. Maybe you accidentally
left out the -r in your actual code.
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Re: Got a Doubt ! Wanting for your Help ! Plz make it ASAP !
On 2013-11-23 10:44, Dennis Lee Bieber wrote: > On Fri, 22 Nov 2013 23:42:44 -0700, Ian Kelly > declaimed the following: > > > >On Fri, Nov 22, 2013 at 8:47 PM, Dennis Lee Bieber > > wrote: > >> > >> Rice is the plural of rouse > > > >Not according to the dictionary. But it does seem a more likely > >candidate for a hypothetical back formation than "ri", which > >perhaps was your point. > > Mice/Mouse <> Rice/*Rouse Wordplay is one of my worst vouse. ;-) -tkc -- https://mail.python.org/mailman/listinfo/python-list
Re: Got a Doubt ! Wanting for your Help ! Plz make it ASAP !
By the same logic the plural of spouse is spice and most men that have had more than one wife will tell you that, whilst it may be the expectation, it ain't necessarily so ;-) On 23/11/2013 16:44, Dennis Lee Bieber wrote: On Fri, 22 Nov 2013 23:42:44 -0700, Ian Kelly declaimed the following: On Fri, Nov 22, 2013 at 8:47 PM, Dennis Lee Bieber wrote: Rice is the plural of rouse Not according to the dictionary. But it does seem a more likely candidate for a hypothetical back formation than "ri", which perhaps was your point. Mice/Mouse <> Rice/*Rouse -- https://mail.python.org/mailman/listinfo/python-list
Re: Got a Doubt ! Wanting for your Help ! Plz make it ASAP !
On Sun, Nov 24, 2013 at 3:35 AM, Tim Chase wrote: >> Mice/Mouse <> Rice/*Rouse > > Wordplay is one of my worst vouse. ;-) Yeah, some people can come up with bad puns in a trouse. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: Got a Doubt ! Wanting for your Help ! Plz make it ASAP !
On 23/11/2013 17:35, Chris Angelico wrote: On Sun, Nov 24, 2013 at 3:35 AM, Tim Chase wrote: Mice/Mouse <> Rice/*Rouse Wordplay is one of my worst vouse. ;-) Yeah, some people can come up with bad puns in a trouse. ChrisA Well! That wasn't very nouse! -- https://mail.python.org/mailman/listinfo/python-list
Re: Using sh library with grep command
On Sat, Nov 23, 2013 at 5:29 PM, Peter Otten <__pete...@web.de> wrote:
> Luca wrote:
>
>> I'm trying to use sh (https://pypi.python.org/pypi/sh) for calling
>> system grep command but it's now working as expected.
>>
>> An example:
>>
>> import sh
>> sh.grep('abc', os.getcwd(), '-r')
>>
>> But I get the ErrorReturnCode_1: exception, that I learned is the
>> normal exit code for grep command when it not found any match.
>>
>> The error instance object reported that the command run is:
>>
>> *** ErrorReturnCode_1:
>> RAN: '/usr/bin/grep abc /Users/keul/test_sh'
>>
>> Obviously manually running the command I get some output and exit code 0.
>>
>> Where I'm wrong?
>
> Did you run grep with or without the -r option?
>
> The code sample and the error message don't match. Maybe you accidentally
> left out the -r in your actual code.
>
Sorry all, it was a stupid error and I provided a bad example.
I was running...
sh.grep('"abc"', os.getcwd(), '-r')
...and the output of the command inside the exception was exactly...
RAN: '/usr/bin/grep "abc" /Users/keul/test_sh -r'
So, at first glance it was ok (copying/pasting it in in the terminal
return exactly was I expected).
The error? The doublequote inclusion.
Using this...
sh.grep('abc', os.getcwd(), '-r')
...I get this output...
RAN: '/usr/bin/grep abc /Users/keul/test_sh -r'
But this time I get the expected result (both in terminal and python
env). So seems that when quoting you get a false positive right
command output but a wrong execution.
--
-- luca
twitter: http://twitter.com/keul
linkedin: http://linkedin.com/in/lucafbb
blog: http://blog.keul.it/
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Re: Got a Doubt ! Wanting for your Help ! Plz make it ASAP !
On Sat, 23 Nov 2013 02:18:03 +, Steven D'Aprano wrote: > On Sat, 23 Nov 2013 01:55:44 +, Denis McMahon wrote: >> On Fri, 22 Nov 2013 18:22:29 +0530, Bharath Kummar wrote: >>> Could you PLEASE provide me with the codes (codes only for the asked >>> queries) ? >> The codes are: >> 1) 7373a28109a7c4473a475b2137aa92d5 2) f2fae9a4ad5ded75e4d8ac34b90d5c9c >> 3) 935544894ca6ad7239e0df048b9ec3e5 4) b1bc9942d029a4a67e4b368a1ff8d883 >> Please contact your local government eavesdropping agency for >> assistance on decoding the codes. > I'm not an expert on Indian English, but I understand that in that > dialect it is grammatically correct to say "the codes", just as in UK > and US English it is grammatically correct to say "the programs". Sorry, I should obviously have replied to the OP as follows: We don't write your python code for you, we help you to fix your python code. Please post the code you have developed to solve your problem, and explain what you expect it to do, and then we will try and explain to you why it's doing what it does instead of what you want it to. -- Denis McMahon, denismfmcma...@gmail.com -- https://mail.python.org/mailman/listinfo/python-list
Re: Method chaining
On 22/11/2013 11:26, Steven D'Aprano wrote:
A frequently missed feature is the ability to chain method calls:
x = []
x.append(1).append(2).append(3).reverse().append(4)
=> x now equals [3, 2, 1, 4]
This doesn't work with lists, as the methods return None rather than
self. The class needs to be designed with method chaining in mind before
it will work, and most Python classes follow the lead of built-ins like
list and have mutator methods return None rather than self.
Here's a proof-of-concept recipe to adapt any object so that it can be
used for chaining method calls:
class chained:
def __init__(self, obj):
self.obj = obj
def __repr__(self):
return repr(self.obj)
def __getattr__(self, name):
obj = getattr(self.obj, name)
if callable(obj):
def selfie(*args, **kw):
# Call the method just for side-effects, return self.
_ = obj(*args, **kw)
return self
return selfie
else:
return obj
chained([]).append(1).append(2).append(3).reverse().append(4)
=> returns [3, 2, 1, 4]
That's pretty cool. However, I can imagine it would be nice for the
chained object to still be an instance of its original type. How about
something like this:
def getr(self, name):
obj = super(type(self), self).__getattribute__(name)
if callable(obj):
def selfie(*args, **kwargs):
result = obj(*args, **kwargs)
return self if result is None else result
return selfie
return obj
class chained(type):
typedict = {}
def __new__(cls, obj):
if type(obj) not in cls.typedict:
cls.typedict[type(obj)] = type.__new__(
cls, 'chained%s' % type(obj).__name__,
(type(obj),), {'__getattribute__': getr})
return cls.typedict[type(obj)](obj)
# In the interactive interpreter:
>>> d = chained({}).update({1: 2}).update({3: 4})
>>> d
{1: 2, 3: 4}
>>> type(d)
>>> isinstance(d, dict)
True
The above code isn't very good - it will only work on types whose
constructor will copy an instance, and it discards the original. And its
dir() is useless. Can anyone suggest something better?
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Re: Periodic execution with asyncio
Thanks a lot for your helpful posts, Terry!
On 11/23/2013 01:00 AM, Terry Reedy wrote:
* Make the task function a parameter 'func'.
I actually like subclassing, but yes I know there are some downsides :)
* Rename start to _set to better describe what is does and call it in
the _run function to not repeat the handler setting line. (If 'start'
has any magic meaning, I am not aware of it. I am aware that there
could be situations in which one would want a public method, to be
called from other handlers. But that would be a different class ;-)
* Comment out the stop method because it is useless in the current
usage. I believe handler.cancel is only relevant after the handler is
set and before it is fired. This can only be done from another handler.
You are right, the handler setting line should not be repeated.
I choose start() and stop() for controlling the task because this is an
interface I would instantly understand as a user of this class.
By the way: My whole motivation is, that I want to implement such a task
class in a network library I am currently writing.
On 11/23/2013 02:33 AM, Terry Reedy wrote:
I was initially baffled also until I managed to assemble all the
needed pieces.
import asyncio
def f():
print('Hello World')
@asyncio.coroutine
def g(func, interval):
while True:
yield from asyncio.sleep(interval)
func()
loop = asyncio.get_event_loop()
try:
loop.run_until_complete(asyncio.Task(g(f, 2)))
except KeyboardInterrupt:
print('Loop stopped')
Thanks, now I got it. I just couldn't figure out that I have to yield
from the sleep function.
Now putting this into a PeriodicTask class that provides a similar
interface like our callback version, I get:
import asyncio
class PeriodicTask2(object):
def __init__(self, func, interval):
self.func = func
self.interval = interval
self._loop = asyncio.get_event_loop()
def start(self):
self.loop.run_until_complete(asyncio.Task(self._run()))
@asyncio.coroutine
def _run(self):
while True:
yield from asyncio.sleep(self.interval)
self.func()
I don't know if I misunderstood anything, but as a user of this class I
am not able to run two task simultaneously because start() will block.
In the callback version I could instanciate two PeriodicTasks and run
them both at the same time (after a call to loop.run_forever()), which
is actually what I wanted to achieve with this class.
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Re: Behavior of staticmethod in Python 3
Op 23-11-13 10:01, Peter Otten schreef: > > Your script is saying that a staticmethod instance is not a callable object. > It need not be because > > Foo.foo() > > doesn't call the Foo.foo attribute directly, it calls > > Foo.foo.__get__(None, Foo)() I think you are burdening the programmer with implemantation details that don't matter to him. IMO if Foo.foo() is legal then Foo.foo is callable. That the actual call is delegated to Foo.foo.__get__(None, Foo) shouldn't matter. -- Antoon Pardon -- https://mail.python.org/mailman/listinfo/python-list
Re: Behavior of staticmethod in Python 3
On Sun, Nov 24, 2013 at 2:00 AM, Antoon Pardon wrote: > IMO if Foo.foo() is legal then Foo.foo is callable. That the actual call > is delegated to Foo.foo.__get__(None, Foo) shouldn't matter. I absolutely agree. But isn't that already the case? I seem to be missing something here. >>> class Foo: @staticmethod def foo(): pass >>> callable(Foo.foo) True >>> callable(Foo().foo) True ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: Behavior of staticmethod in Python 3
Antoon Pardon wrote: > Op 23-11-13 10:01, Peter Otten schreef: > >> >> Your script is saying that a staticmethod instance is not a callable >> object. It need not be because >> >> Foo.foo() >> >> doesn't call the Foo.foo attribute directly, it calls >> >> Foo.foo.__get__(None, Foo)() > > I think you are burdening the programmer with implemantation details > that don't matter to him. > > IMO if Foo.foo() is legal then Foo.foo is callable. That the actual call > is delegated to Foo.foo.__get__(None, Foo) shouldn't matter. If you read the original post -- I think in this case the details do matter. What is your highlevel explanation for >> class Foo: ... @staticmethod ... def foo(): pass ... try: foo() ... except Exception as err: ... print(err) ... 'staticmethod' object is not callable >>> Foo.foo() or maybe clearer: >>> @staticmethod ... def foo(): pass ... >>> def bar(): pass ... >>> class Foo: ... foo = foo ... bar = bar ... >>> Foo.bar is bar True >>> Foo.foo is foo False How would you explain that without mentioning the descriptor protocol? -- https://mail.python.org/mailman/listinfo/python-list
Re: Got a Doubt ! Wanting for your Help ! Plz make it ASAP !
On Friday, November 22, 2013 8:18:03 PM UTC-6, Steven D'Aprano wrote: > [snip] I look forward to the day that "rice" is the plural of "ri" Yes and i look forward to the day when "thread hijacking" perpetrated under the guise of "exploring linguistic minutia" perpetrated under the guise of "vanity" is frowned upon. PS: The only method chaining going on here is via the .brown_nosing() method. -- https://mail.python.org/mailman/listinfo/python-list
stuck at this from so much time,need help....please ..
data = sock.recv(RECV_BUFFER)
username = str(sock.getpeername())
username = usernames[username]
if command == "/quit":
print data
sock.send("bye")
sock.close()
CONNECTION_LIST.remove(sock)
even if the received data is '/quit' the if condition not excuting...please
help.
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Re: stuck at this from so much time,need help....please ..
On Sun, Nov 24, 2013 at 9:15 AM, Bhanu Karthik
wrote:
> data = sock.recv(RECV_BUFFER)
> username = str(sock.getpeername())
> username = usernames[username]
> if command == "/quit":
> print data
> sock.send("bye")
> sock.close()
> CONNECTION_LIST.remove(sock)
>
> even if the received data is '/quit' the if condition not excuting...please
> help.
At what point is command set? You're setting data here; is command
supposed to be derived from data?
This looks like a MUD or IRC style of server, which would suggest that
commands are terminated by end-of-line. You may need to take content
from the socket (currently in data) and split it off on either "\r\n"
or "\n". But it's hard to tell from this small snippet.
ChrisA
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Re: stuck at this from so much time,need help....please ..
On Saturday, 23 November 2013 14:23:08 UTC-8, Chris Angelico wrote:
> On Sun, Nov 24, 2013 at 9:15 AM, Bhanu Karthik
>
> wrote:
>
> > data = sock.recv(RECV_BUFFER)
>
> > username = str(sock.getpeername())
>
> > username = usernames[username]
>
> > if command == "/quit":
>
> > print data
>
> > sock.send("bye")
>
> > sock.close()
>
> > CONNECTION_LIST.remove(sock)
>
> >
>
> > even if the received data is '/quit' the if condition not excuting...please
> > help.
>
>
>
> At what point is command set? You're setting data here; is command
>
> supposed to be derived from data?
>
>
>
> This looks like a MUD or IRC style of server, which would suggest that
>
> commands are terminated by end-of-line. You may need to take content
>
> from the socket (currently in data) and split it off on either "\r\n"
>
> or "\n". But it's hard to tell from this small snippet.
>
>
>
> ChrisA
sorry its not command its data
I miss wrote it here...
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Re: stuck at this from so much time,need help....please ..
On Sun, Nov 24, 2013 at 9:29 AM, Bhanu Karthik wrote: > sorry its not command its data > > I miss wrote it here... Okay. Start by copying and pasting your actual code, and saying what you're doing to trigger it. If this is a stream socket (eg TCP), you have no way of knowing where one read will end and the next start, so you'll need to do some kind of buffering and splitting. Also, please use something better than Google Groups; your posts are looking rather ugly, and it's the fault of your client rather than yourself. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: stuck at this from so much time,need help....please ..
On Saturday, 23 November 2013 14:23:08 UTC-8, Chris Angelico wrote:
> On Sun, Nov 24, 2013 at 9:15 AM, Bhanu Karthik
>
> wrote:
>
> > data = sock.recv(RECV_BUFFER)
>
> > username = str(sock.getpeername())
>
> > username = usernames[username]
>
> > if command == "/quit":
>
> > print data
>
> > sock.send("bye")
>
> > sock.close()
>
> > CONNECTION_LIST.remove(sock)
>
> >
>
> > even if the received data is '/quit' the if condition not excuting...please
> > help.
>
>
>
> At what point is command set? You're setting data here; is command
>
> supposed to be derived from data?
>
>
>
> This looks like a MUD or IRC style of server, which would suggest that
>
> commands are terminated by end-of-line. You may need to take content
>
> from the socket (currently in data) and split it off on either "\r\n"
>
> or "\n". But it's hard to tell from this small snippet.
>
>
>
> ChrisA
data = sock.recv(RECV_BUFFER)
username = str(sock.getpeername())
username = usernames[username]
if data == "/quit":
print data
sock.send("bye")
sock.close()
CONNECTION_LIST.remove(sock)
this is exact code..
it is not even entering the if ...
I tried ( c= (data is '/quit')if c)
when i print c ,its printing falseI dont understand what is
happening...please help..
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Re: stuck at this from so much time,need help....please ..
In article <8445e47e-7efe-4f37-9b40-db2896d58...@googlegroups.com>,
Bhanu Karthik wrote:
> data = sock.recv(RECV_BUFFER)
> username = str(sock.getpeername())
> username = usernames[username]
> if data == "/quit":
> print data
> sock.send("bye")
> sock.close()
> CONNECTION_LIST.remove(sock)
>
>
> this is exact code..
> it is not even entering the if ...
> I tried ( c= (data is '/quit')if c)
That can't be the exact code. What you posted is a syntax error because
the line after the "if" statement isn't indented properly.
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Re: stuck at this from so much time,need help....please ..
On Sun, Nov 24, 2013 at 9:33 AM, Bhanu Karthik wrote: > this is exact code.. > it is not even entering the if ... > I tried ( c= (data is '/quit')if c) > > when i print c ,its printing falseI dont understand what is > happening...please help.. Again, please get off Google Groups. Have a look at how your posts come out: https://mail.python.org/pipermail/python-list/2013-November/661005.html Note how your quoted text is double-spaced. This is one of the most obvious and obnoxious problems, though not the only one. You have two problems here. Firstly, comparing strings with 'is' is wrong in most cases[1], so stick with ==. And secondly, my crystal ball says that you're typing "/quit" and pressing enter, so your socket read will be "/quit\r\n" or "/quit\n". To properly handle this, you'll need to buffer and split as I was describing. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: stuck at this from so much time,need help....please ..
On Saturday, 23 November 2013 14:37:09 UTC-8, Roy Smith wrote:
> In article <8445e47e-7efe-4f37-9b40-db2896d58...@googlegroups.com>,
>
> Bhanu Karthik wrote:
>
>
>
> > data = sock.recv(RECV_BUFFER)
>
> > username = str(sock.getpeername())
>
> > username = usernames[username]
>
> > if data == "/quit":
>
> > print data
>
> > sock.send("bye")
>
> > sock.close()
>
> > CONNECTION_LIST.remove(sock)
>
> >
>
> >
>
> > this is exact code..
>
> > it is not even entering the if ...
>
> > I tried ( c= (data is '/quit')if c)
>
>
>
> That can't be the exact code. What you posted is a syntax error because
>
> the line after the "if" statement isn't indented properly.
indentation is correct when I trying to paste it here,it is showing like it is
unindented.
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Re: stuck at this from so much time,need help....please ..
On Sun, Nov 24, 2013 at 9:39 AM, Bhanu Karthik wrote: > indentation is correct when I trying to paste it here,it is showing like it > is unindented. That's because Google Groups mucks things up. Get a better client. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: stuck at this from so much time,need help....please ..
On 23/11/2013 22:29, Bhanu Karthik wrote:> On Saturday, 23 November 2013
14:23:08 UTC-8, Chris Angelico wrote:
>> On Sun, Nov 24, 2013 at 9:15 AM, Bhanu Karthik
>> wrote:
>> > data = sock.recv(RECV_BUFFER)
>> > username = str(sock.getpeername())
>> > username = usernames[username]
>> > if command == "/quit":
>> > print data
>> > sock.send("bye")
>> > sock.close()
>> > CONNECTION_LIST.remove(sock)
>> >
>> > even if the received data is '/quit' the if condition not
excuting...please help.
>>
>> At what point is command set? You're setting data here; is command
>> supposed to be derived from data?
>>
>> This looks like a MUD or IRC style of server, which would suggest that
>> commands are terminated by end-of-line. You may need to take content
>> from the socket (currently in data) and split it off on either "\r\n"
>> or "\n". But it's hard to tell from this small snippet.
>>
>> ChrisA
>
> sorry its not command its data
>
> I miss wrote it here...
>
If the 'if' condition not executing then it must be because the
received data isn't "/quit", so what is it? Print it out, or, even
better, print out repr(data), which will show you any spaces or "\n" in
it.
sock.recv(RECV_BUFFER) will receive up to RECV_BUFFER bytes, so if the
sender is sending other stuff after the "/quit" and RECV_BUFFER > 5,
then you might be receiving some of that later stuff too.
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Re: Help me to print to screen as well as log
On Sat, 23 Nov 2013 05:11:11 -0800 (PST), Himanshu Garg wrote: How can I write to the same file from two different scripts opened at same time? Using what version of python and on what OS? Sone OS's will open the file exclusively by default. Others will let you stomp all over some other process' output. Why not show us what you're trying and what happens and ask a much more specific question? -- DaveA -- https://mail.python.org/mailman/listinfo/python-list
Re: Got a Doubt ! Wanting for your Help ! Plz make it ASAP !
On Friday, November 22, 2013 8:18:03 PM UTC-6, Steven D'Aprano wrote: > As this is an international forum, it behoves us all to make allowances > for slight difference in dialect. I don't thank so. What purpose does that serve? If we allow people to speak INCORRECT English under the guise of "political correctness" then no one will benefit. The speaker will continue using the language improperly and his audience will continue to be confused. "But Rick, we don't want to offend people!" Piss off you spineless invertebrate!I would be more offended if people did NOT correct me. People "correct" you when they WANT you to learn, likewise, people "tolerate" you when they want you to remain inferior. "Tolerance and apathy are the last virtues of a dying society" Only those societies with a vision for the future will survive, that is, until they inevitably grow tired from the intense competition and lose their vision THEN apathy sets in and a NEW society steps in to fill the vacuum. "Competition is the engine that drives the cogs of evolution" You are all but pawns in a greater game. It is better to die fighting for SOMETHING, then to wither away intolerant of NOTHING. There exists no utopia. And any pursuit of such ends is foolish. Have you ever even considered what sort of disgusting filth humans would degenerate into if we achieved a utopia free from competition? What would we do all day? What purpose would our lives fulfill? "Would you eat if you were never hungry?" Evolution will NEVER allow such a dismal state to prosper, no, it will stamp out every attempt by convincing the strong to conquer the weak -- and to do so with extreme prejudice! The system abhors the weak; the system ridicules the weak; because the weak serve no end but their own selfish and feeble attempts to convince themselves they are not but lowly pawns. "Time to pull your head out of the sand!" People like you don't want to accept the truth, you want to believe that "living in harmony" is the answer. No, harmony is a death wish. If you wish to reach a state of harmony, then not only are you suicidal but you're homicidal also because you obviously don't care about your fellow human beings future progression. If however, you cared about what really matters, you would advise our Indian friend to speak better English. By learning proper English he can become a productive member of this society -- maybe one day even contributing something remarkable. But until his communication can rise above the level of a 3rd grade public school student in rural Kentucky, he is draining resources instead of creating them!I WANT our Indian friend to become proficient so that he *might* one day be a *worthy* advisory for me to challenge. Anyone can defeat the weak, only the strong have a snowballs chance in hell to defeat the strong. "Who said chivalry was dead?" -- https://mail.python.org/mailman/listinfo/python-list
Re: Got a Doubt ! Wanting for your Help ! Plz make it ASAP !
On 2013-11-23 15:06, Rick Johnson wrote: > I don't thank so. What purpose does that serve? > > If we allow people to speak INCORRECT English under the > guise of "political correctness" then no one will benefit. "I don't thank so"? talk about the plank in your own eye... -tkc -- https://mail.python.org/mailman/listinfo/python-list
Automation P-I-D
I mentioned some time ago about a program to calculate PID constants for tuning controllers, follow the link to its online version algorithm for anyone interested http://pastebin.com/wAqZmVnR I thank you for the help I received from many here on the list. ;D -- https://mail.python.org/mailman/listinfo/python-list
Re: Got a Doubt ! Wanting for your Help ! Plz make it ASAP !
On Sun, Nov 24, 2013 at 10:06 AM, Rick Johnson wrote: > On Friday, November 22, 2013 8:18:03 PM UTC-6, Steven D'Aprano wrote: >> As this is an international forum, it behoves us all to make allowances >> for slight difference in dialect. > > I don't thank so. What purpose does that serve? > ... > Anyone can defeat the weak, only the strong have a snowballs > chance in hell to defeat the strong. Think. Snowball's. Welcome to Muphry's Law. https://en.wikipedia.org/wiki/Muphry's_law ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: Got a Doubt ! Wanting for your Help ! Plz make it ASAP !
On Fri, Nov 22, 2013 at 8:47 PM, Dennis Lee Bieber wrote: > Rice is the plural of rouse And spice is the plural of spouse. :-) -- Greg -- https://mail.python.org/mailman/listinfo/python-list
Re: Got a Doubt ! Wanting for your Help ! Plz make it ASAP !
Ian Kelly wrote: I wouldn't necessarily even consider it an Indian thing, as I've known Americans to use the same phrase. In my experience it seems to be a scientific community vs. computer science community thing. I often hear Fortran people talk about "a code" where we would say "a library" or "a piece of code". -- Greg -- https://mail.python.org/mailman/listinfo/python-list
Re: Help me to print to screen as well as log
> I want that print "hello" should appear on screen as well as get saved in a
> log file.
> How can I accomplish this?
There are many ways to do this, here's one:
class MultiWriter(object):
def __init__(self, *writers):
self.writers = writers
self.isatty = False
def write(self, data):
for writer in self.writers:
writer.write(data)
def flush(self):
for writer in self.writers:
writer.flush()
out = open('/tmp/log.txt', 'a')
import sys
sys.stdout = MultiWriter(sys.stdout, out)
print('hello')
IMO you're better with the logging package, see
http://docs.python.org/2/howto/logging.html#configuring-logging for more
details.
--
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Re: Method chaining
On 23/11/2013 19:53, Rotwang wrote:
[...]
That's pretty cool. However, I can imagine it would be nice for the
chained object to still be an instance of its original type. How about
something like this:
[crap code]
The above code isn't very good - it will only work on types whose
constructor will copy an instance, and it discards the original. And its
dir() is useless. Can anyone suggest something better?
Here's another attempt:
class dummy:
pass
def initr(self, obj):
super(type(self), self).__setattr__('__obj', obj)
def getr(self, name):
try:
return super(type(self), self).__getattribute__(name)
except AttributeError:
return getattr(self.__obj, name)
def methr(method):
def selfie(self, *args, **kwargs):
result = method(self.__obj, *args, **kwargs)
return self if result is None else result
return selfie
class chained(type):
typedict = {}
def __new__(cls, obj):
if type(obj) not in cls.typedict:
dict = {}
for t in reversed(type(obj).__mro__):
dict.update({k: methr(v) for k, v in t.__dict__.items()
if callable(v) and k != '__new__'})
dict.update({'__init__': initr, '__getattribute__': getr})
cls.typedict[type(obj)] = type.__new__(cls, 'chained%s'
% type(obj).__name__, (dummy, type(obj)), dict)
return cls.typedict[type(obj)](obj)
This solves some of the problems in my earlier effort. It keeps a copy
of the original object, while leaving its interface pretty much
unchanged; e.g. repr does what it's supposed to, and getting or setting
an attribute of the chained object gets or sets the corresponding
attribute of the original. It won't work on classes with properties,
though, nor on classes with callable attributes that aren't methods (for
example, a class with an attribute which is another class).
--
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Re: Method chaining
On 24/11/2013 00:28, Rotwang wrote: [...] This solves some of the problems in my earlier effort. It keeps a copy of the original object, Sorry, I meant that it keeps a reference to the original object. -- https://mail.python.org/mailman/listinfo/python-list
Re: python for everyday tasks
Thank you very much, that's much more detailed than I dared to hope for, it's going to be a great help. :) Since the course will begin in January, I'm just starting to prepare, I'm happy to hear any other ideas, comments. Thank you all, Mate -- https://mail.python.org/mailman/listinfo/python-list
Re: Got a Doubt ! Wanting for your Help ! Plz make it ASAP !
On Sat, 23 Nov 2013 15:06:42 -0800, Rick Johnson wrote: > On Friday, November 22, 2013 8:18:03 PM UTC-6, Steven D'Aprano wrote: >> As this is an international forum, it behoves us all to make allowances >> for slight difference in dialect. > > I don't thank so. What purpose does that serve? > > If we allow people to speak INCORRECT English under the guise of > "political correctness" then no one will benefit. [...] Thank you for the lesson in the virtues of bluntness, and why politeness and political correctness is a vice. Never let it be said that I'm not willing to learn from you Rick, so keeping everything you said in mind, let me say this: It's not INCORRECT English, you small-minded little git. That was the point of my post, which clearly was too difficult for your feeble little thought processes to comprehend. Where do you, an American, get off telling others that their regional variety of English is incorrect? After criticising me for hijacking threads, the hypocrisy and cheek of you doing the same thing with your odious and naive social Darwinism is breathtaking. Sod off and take your despicable little Randian pseudo- philosophy with you. -- Steven -- https://mail.python.org/mailman/listinfo/python-list
Re: Recursive generator for combinations of a multiset?
On Sat, 23 Nov 2013 04:23:42 +
MRAB wrote:
> On 23/11/2013 00:58, John O'Hagan wrote:
> > On Thu, 21 Nov 2013 12:59:26 -0800
> > Dan Stromberg wrote:
> >
> >> On Wed, Nov 20, 2013 at 10:46 PM, John O'Hagan
> >> wrote:
> >>
> >> >
> >> > Short story: the subject says it all, so if you have an answer
> >> > already, fire away. Below is the long story of what I'm using it
> >> > for, and why I think it needs to be recursive. It may even be of
> >> > more general interest in terms of filtering the results of
> >> > generators.
> >> >
> >>
> >> I think you probably need permutations rather than combinations.
> >>
> >> Also, I think you'll need to form a word (partitioned off by
> >> spaces), and then check it against a set
> >> containing /usr/share/dict/words before recursing for the
> >> remainder of the sentence - this should speed things up a LOT.
> >
> > Thanks for the reply. If I understand you correctly, you are
> > suggesting permuting the input _characters_ to form words and then
> > seeing if they exist, as opposed to my approach of combining known
> > words and seeing if they are anagrams. (Permutations of words would
> > not help find anagrams as they merely change the word order). Here
> > is an attempt at that:
> >
> > def anagrams(partition, input_string):
> > """Find anagrams which fit given partition of input string
> > length""" if not partition:
> > yield (), input_string
> > return
> > for words, checkstring in anagrams(partition[:-1],
> > input_string): for word in itertools.permutations(checkstring,
> > partition[-1]): word = ''.join(word)
> > if word in WORDS: #WORDS is collection of dictionary
> > words newstring = checkstring
> > for l in word:
> > newstring = newstring.replace(l, '' , 1)
> > yield words + (word,), newstring
> >
> > There are two problems with this. If there are repeated characters
> > in the input, redundant results are produced; a multiset-permutation
> > algorithm would fix this. But the main problem is it is incredibly
> > slow: on my run-of-the-mill laptop, it chokes on anything longer
> > than about 10 characters, spending most of its time rejecting
> > non-words.
> >
> > Or have I misunderstood your suggestion?
> >
> If you want to know how to get unique permutations, have a look here:
>
> http://mail.python.org/pipermail/python-ideas/2013-October/023610.html
>
For this particular problem I don't need multiset permutations but
multiset combinations (see original post). But that thread was a good
read.
This is a little OT, but I did need multiset permutations a couple of
years back for a project involving the generation of musical
structures. There was zero interest here at the time (fair enough!) and
I ended up implementing the C++ function "next_permutation" in Python.
So it was good to read in that thread that there seems to be some
interest in incorporating multiset combinatorics into itertools
(including your excellent contribution). IMHO the scepticism there about
non-exotic use-cases was unjustified. Leaving aside my probably atypical
uses, it crops in many ordinary situations dealing with arrangements of
multiple items of several types where each instance of a type is
equivalent. Take stock control: when stacking a warehouse shelf it
doesn't matter which particular box goes where, only how many of each
size. Or timetabling: if Mrs Smith teaches the same students maths on
Tuesdays and Thursdays, swapping the classes does nothing.
The same goes for cyclic and cyclic-multiset ("necklaces")
combinatorics, where the beginning and end of an arrangement is not
significant, eg. 24-hour rostering, laying tiles, etc. And musical
scales.
Disclaimer: I am far from expert on combinatorics but seem to end up
using it a lot.
--
John
--
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Re: Recursive generator for combinations of a multiset?
On Fri, 22 Nov 2013 22:33:29 -0800 Dan Stromberg wrote: > On Fri, Nov 22, 2013 at 4:58 PM, John O'Hagan > wrote: > > > On Thu, 21 Nov 2013 12:59:26 -0800 > > Dan Stromberg wrote: > > > > > On Wed, Nov 20, 2013 at 10:46 PM, John O'Hagan > > > wrote: > > > > > > > > > > > Short story: the subject says it all, so if you have an answer > > > > already, fire away. Below is the long story of what I'm using it > > > > for, and why I think it needs to be recursive. It may even be of > > > > more general interest in terms of filtering the results of > > > > generators. > > > > > > > > > > I think you probably need permutations rather than combinations. > > > > > > Also, I think you'll need to form a word (partitioned off by > > > spaces), and then check it against a set > > > containing /usr/share/dict/words before recursing for the > > > remainder of the sentence - this should speed things up a LOT. > > > > Thanks for the reply. If I understand you correctly, you are > > suggesting permuting the input _characters_ to form words and then > > seeing if they exist, as opposed to my approach of combining known > > words and seeing if they are anagrams. (Permutations of words would > > not help find anagrams as they merely change the word order). Here > > is an attempt at that: > > > You've interpreted me correctly. > > However, I was thinking about this in the back of my mind, and > decided it would probably be best to inhale /usr/share/dict/words (if > on Linux), and pull out words of the corrects lengths (as separated > by the blanks) over the correct (possible) alphabet, and permute > Those, afterward checking if they form good anagrams of the original > sentence. This would probably be much faster, since English isn't > that dense of a space. If you look back at my original question, you'll see that's pretty much what I've done. I didn't spell out all the details, but I made a dictionary of wordlength keys containing lists of all dictionary words of that length made of the correct sub-alphabet. But to to recap the problem: to produce non-redundant anagram phrases, I need the cartesian product (not permutations) of these lists if each is unique, but with a subroutine producing multiset combinations if a list is repeated, i.e., if a particular length is called for more than once. The version I have so far is correct but substantially slower than the product-only one, which just goes ahead and produces all the redundant results. This seems counter-intuitive, and my theory is that this is because I am unable to "prune" the non-recursive combination algorithm I currently have. Regards, -- John -- https://mail.python.org/mailman/listinfo/python-list
Importing by file name
As part of a post on python-ideas, I wanted to knock together a quick
little script that "imports" a file based on its name, in the same way
that the Python interpreter will happily take an absolute pathname for
the main script. I'm sure there's a way to do it, but I don't know
how. Obviously the import statement can't do it, but I've been poking
around with __import__ and importlib without success. (Experiments are
being done on Python 3.3; if a different version would make the job
easier I'm happy to switch. This is just a curiosity tinkering.)
Here's my current attempts (tracebacks chomped as they aren't very
helpful here):
>>> import "/x.py"
SyntaxError: invalid syntax
>>> importlib.import_module("/x.py")
ImportError: No module named '/x'
>>> importlib.import_module("/x")
ImportError: No module named '/x'
The best I can come up with is manually execing the file contents:
>>> g={}
>>> exec("def __main__():\n\tprint('Hello, world!')\n",g)
>>> g["__main__"]()
Hello, world!
But that's not importing. Is there a way to do this as a module import?
ChrisA
--
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Re: Importing by file name
On Sat, Nov 23, 2013 at 7:41 PM, Chris Angelico wrote: > As part of a post on python-ideas, I wanted to knock together a quick > little script that "imports" a file based on its name, in the same way > that the Python interpreter will happily take an absolute pathname for > the main script. I'm sure there's a way to do it, but I don't know > how. Obviously the import statement can't do it, but I've been poking > around with __import__ and importlib without success. (Experiments are > being done on Python 3.3; if a different version would make the job > easier I'm happy to switch. This is just a curiosity tinkering.) The easiest way is probably to modify what directories python searches - sys.path: import os import sys def file_import(path): dname, fname = os.path.split(path) modname, _ext = os.path.splitext(fname) sys.path.insert(0, dname) try: return __import__(modname) finally: del sys.path[0] -- Devin -- https://mail.python.org/mailman/listinfo/python-list
Re: Help me to print to screen as well as log
I have simply opened file in append mode in linux.
script 1 :
file = open("output.log", "a")
file.write()
file.flush()
script 2:
file = open("output.log", "a")
file.write()
file.flush()
It writes properly to the file.
--
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Re: Got a Doubt ! Wanting for your Help ! Plz make it ASAP !
On Sat, Nov 23, 2013 at 5:38 PM, Steven D'Aprano wrote: > Thank you for the lesson in the virtues of bluntness, and why politeness > and political correctness is a vice. Never let it be said that I'm not > willing to learn from you Rick, so keeping everything you said in mind, > let me say this: > > --[tirade of insults]-- No, please don't. If Rick is that annoying and harmful to discussion (he is), rather than blowing up at him, can we please ban him from the ML? I know that usenet cannot be affected, but anyone that cares about productive discussions can either maintain a killfile or use the mailing list. The state of discussion here as it stands is absurd, what with the trolling and irrelevant rants and subsequent explosions of hate. This list needs stronger moderation. Please. -- Devin -- https://mail.python.org/mailman/listinfo/python-list
Re: Got a Doubt ! Wanting for your Help ! Plz make it ASAP !
On Sun, Nov 24, 2013 at 6:32 PM, Devin Jeanpierre wrote: > On Sat, Nov 23, 2013 at 5:38 PM, Steven D'Aprano > wrote: >> Thank you for the lesson in the virtues of bluntness, and why politeness >> and political correctness is a vice. Never let it be said that I'm not >> willing to learn from you Rick, so keeping everything you said in mind, >> let me say this: >> >> --[tirade of insults]-- > > No, please don't. > > If Rick is that annoying and harmful to discussion (he is), rather > than blowing up at him, can we please ban him from the ML? I know that > usenet cannot be affected, but anyone that cares about productive > discussions can either maintain a killfile or use the mailing list. > The state of discussion here as it stands is absurd, what with the > trolling and irrelevant rants and subsequent explosions of hate. > > This list needs stronger moderation. Please. I think this was a case of misrecognized humour... Rick was saying that it's better to offend people than to let them be wrong, so Steven took that style to its obvious extreme. Also, Rick clearly went into Room 12, when he should have gone to 12A, next door.[1] ChrisA [1] http://www.montypython.net/scripts/argument.php -- https://mail.python.org/mailman/listinfo/python-list
