codecs.register_error for strict, unicode.encode() and str.decode()
Hello, I think I'm missing some piece here. I'm trying to register a default error handler for handling exceptions for preventing encoding/decoding errors (I know how this works and that making this global is probably not a good practice, but I found this strange behaviour while writing a proof of concept of how to let Python work in a more forgiving way). What I discovered is that register_error() for strict seems to work in the way I expect for string decoding, not for unicode encoding. That's what happens on Mac, Python 2.7.1 from Apple: melquiades:tmp alan$ cat minimal_test_encode.py # -*- coding: utf-8 -*- import codecs def handle_encode(e): return (ASD, e.end) codecs.register_error(strict, handle_encode) print uà.encode(ascii) melquiades:tmp alan$ python minimal_test_encode.py Traceback (most recent call last): File minimal_test_encode.py, line 10, in module uà.encode(ascii) UnicodeEncodeError: 'ascii' codec can't encode character u'\xe0' in position 0: ordinal not in range(128) OTOH this works properly: melquiades:tmp alan$ cat minimal_test_decode.py # -*- coding: utf-8 -*- import codecs def handle_decode(e): return (uASD, e.end) codecs.register_error(strict, handle_decode) print à.decode(ascii) melquiades:tmp alan$ python minimal_test_decode.py ASDASD What piece am I missing? The doc at http://docs.python.org/library/codecs.html says For encoding /error_handler/ will be called with a UnicodeEncodeError http://docs.python.org/library/exceptions.html#exceptions.UnicodeEncodeError instance, which contains information about the location of the error., is there any reason why the standard strict handler cannot be replaced? Thanks for any clue. File links: https://dl.dropbox.com/u/249926/minimal_test_decode.py https://dl.dropbox.com/u/249926/minimal_test_encode.py -- Alan Franzoni contact me at public@[mysurname].eu -- http://mail.python.org/mailman/listinfo/python-list
Re: Behaviour-based interface/protocol implementation?
On Thu, Jan 27, 2011 at 11:41 PM, Daniel Urban urban.d...@gmail.com wrote: Actually it can. You don't have to modify the object, just check for the desired methods/signature/whatever. See for example the implementation of collections.Hashable.__subclasshook__ in _abcoll.py and the abc.ABCMeta.__instancecheck__ method. Mmh, I don't get your examples (subclasshook checks for *classes*, not instances, and ABCMeta is a metaclass whose instance is an ABC), but after properly looking at the PEP (__instancecheck__ seems to be poorly documented in python standard docs) I've seen that yes, __instancecheck__ on an ABC can actually be used in place of maybe_implemented_by and hooking into isinstance(). Thanks! -- Alan Franzoni -- contact me at public@[mysurname].eu -- http://mail.python.org/mailman/listinfo/python-list
Re: Behaviour-based interface/protocol implementation?
On Wed, Jan 26, 2011 at 7:23 PM, Daniel Urban urban.d...@gmail.com wrote: That's just what I'd like and I suppose can't be currently done with current ABC, PyProtocols or zope.interface implementations, right? It can. With __instancecheck__ you can override isinstance. It is possible (for example) to write a subclass of abc.ABCMeta, which extends __instancecheck__ to use an _instancehook classmethod similarly to __subclasshook__. Then in your MyInterface class you can implement _instancehook to check for methods/signatures/whatever you want. Yes, __instancecheck__ could be used as an alternative hook with respect to maybe_implemented_by(), but there's no such logic for signature checking. That's a minor detail, I think. -- Alan Franzoni -- contact me at public@[mysurname].eu -- http://mail.python.org/mailman/listinfo/python-list
Re: Behaviour-based interface/protocol implementation?
On Thu, Jan 27, 2011 at 8:03 PM, Alan Franzoni mail...@franzoni.eu wrote: Yes, __instancecheck__ could be used as an alternative hook with respect to maybe_implemented_by(), but there's no such logic for signature checking. That's a minor detail, I think. On the contrary, now that I double checked, it can't be used that way; I don't want to modify the object I'm testing (it could be a third party object) nor I want to force it to be registered as a certain ABC; so __instancecheck__() is just useless here. -- Alan Franzoni -- contact me at public@[mysurname].eu -- http://mail.python.org/mailman/listinfo/python-list
Re: Behaviour-based interface/protocol implementation?
On Thu, Jan 27, 2011 at 8:58 PM, Ethan Furman et...@stoneleaf.us wrote: When you signature check, do you mean counting the number of arguments, or actually checking argument types? In order to check for argument types I should either assume type annotation (python 3 only, optional) or parse the docstring for the method, which might not be available or be out of sync. I just want to check for method name, number and/or names of the arguments. It might not be trivial in python because the very same argument can be passed either as a positional or a kw argument, so def method1(self, a, b): ... def method1(self, c, d): ... could satisfy or not the very same interface, depending whether the args are passed as postional or kw. -- Alan Franzoni -- contact me at public@[mysurname].eu -- http://mail.python.org/mailman/listinfo/python-list
Re: Behaviour-based interface/protocol implementation?
On Thu, Jan 27, 2011 at 10:30 PM, Carl Banks pavlovevide...@gmail.com wrote: Write some kind of signature proxy to do it. I don't have a specific implementation idea yet, I see how that grows. Based on this thread, you have quite specific requirements, so it's doubtful someone else has implemented exactly what you want. Yes, but asking is better than blinding reimplementing :-) And because it hasn't been mentioned in this thread yet--surprisingly-- many people in Python prefer the EAFP strategy, Easier to Ask Forgiveness than Permission, that is, to just do it and handle the resulting exception: try: myobj.somemethod(somevalue) except AttributeError: # doesn't fit signature, so do nothing pass Sure. That's an approach. But this has drawbacks. - it violates the CQS principle: http://en.wikipedia.org/wiki/Command-query_separation - Maybe my interface has not just a single method, and I might want to call multiple methods on my object. I need to check for all signatures before proceeding. - When calling the method, if an exception is raised - either AttributeError or TypeError most of the times - it could not be generated from my own call, but from a call deeper into the stack; It's easy to just think that object doesn't support that interface I could mistake an object for not supporting an interface, and I could silently swallow a true runtime exception instead. Maybe some stack analysis could be performed, but I'd prefer to check as much as I can *before* calling. - Sometimes I'd like to group objects depending on their *behaviour* (not their type), and then feed them somewhere else without actually calling their methods. If I can know their behaviour just after they've been called, it might be just too late. -- Alan Franzoni -- contact me at public@[mysurname].eu -- http://mail.python.org/mailman/listinfo/python-list
Re: Behaviour-based interface/protocol implementation?
On Tue, Jan 25, 2011 at 6:48 PM, Terry Reedy tjre...@udel.edu wrote: This is correct! print(len(mo)) TypeError: object of type 'MyObj' has no len() That's interesting. I must admit I was not thinking about special methods in my original post, I used that example just because of Chris response. by the way, define 'correct' - if that means 'that's how this works in python', it's a tautology, not correctness :-) Instead I think this highlights an asymmetry in how python handles special methods, and makes it less ducktyped than I wanted. Consider this: class MyObject(object): @staticmethod def __len__(): return 1 mo = MyObject() print mo.__len__ print len(mo) class LenObj(object): def __len__(self): return 3 lo = LenObj() print lo.__len__ print len(lo) import types class OtherObj(object): pass oo = OtherObj() def __len__(self): return 2 oo.__len__ = types.MethodType(__len__, oo, OtherObj) print oo.__len__ print len(oo) Output: function __len__ at 0x1004bb938 1 bound method LenObj.__len__ of __main__.LenObj object at 0x1004ce510 3 bound method OtherObj.__len__ of __main__.OtherObj object at 0x1004ce590 Traceback (most recent call last): File pymethods.py, line 34, in module print len(oo) TypeError: object of type 'OtherObj' has no len() The problem is not function attributes - the problem is that the __len__() method must be set on the class, not on the instance. I think this is not completely clear here: http://docs.python.org/reference/datamodel.html By the way, my original post didn't take into account special methods - let's suppose they don't exist for a moment. I'd just like to check *at runtime* whether an object *any object!* respects a certain signature. *I don't want to care about the class of that object because I want true duck typing*. I mean, I should be able to pass *anything* that responds to a certain contract: @DuckType class MyInterface(object): def someMethod(self): pass def otherMethod(self, a, b): pass class SomeObj(object): @classmethod def someMethod(cls): pass @classmethod def otherMethod(cls, a, b): pass class OtherObj(object): def someMethod(self): pass def otherMethod(cls, a, b): pass class ThirdObj(object): pass oo = OtherObj() to = ThirdObj() to.someMethod = lambda: None to.otherMethod = lambda a,b: None MyInterface.maybe_implemented_by(oo) # - True MyInterface.maybe_implemented_by(to) # - True MyInterface.maybe_implemented_by(SomeObj) # - True That's just what I'd like and I suppose can't be currently done with current ABC, PyProtocols or zope.interface implementations, right? -- Alan Franzoni -- contact me at public@[mysurname].eu -- http://mail.python.org/mailman/listinfo/python-list
Re: Behaviour-based interface/protocol implementation?
On Tue, Jan 25, 2011 at 7:55 AM, Chris Rebert c...@rebertia.com wrote: Not true actually: Python 2.7.1 (r271:86832, Dec 5 2010, 00:12:20) [GCC 4.2.1 (Apple Inc. build 5664)] on darwin Type help, copyright, credits or license for more information. class MyContainer(object):# no special inheritance ... def __len__(self): ... return 42 ... # didn't do any registration. from collections import Sized issubclass(MyContainer, Sized) True isinstance(MyContainer(), Sized) True You're right, I forgot about subclass check. But that's really a placebo, because it statically checks the object's *class* for such method, not the actual instance: from collections import Sized class MyObj(object): pass mo = MyObj() mo.__len__ = lambda: 1 print isinstance(mo, Sized) False Not precisely that I know of, no. The `abc`/`collections` system comes closest, but it does not check method signatures; it merely verifies methods' existence. It only verifies the method's existence on the class. It does nothing of what I'd like at runtime. You could *definitely* write something like that by combining the `abc` and `inspect` modules though: http://docs.python.org/library/inspect.html#inspect.getargspec http://docs.python.org/library/abc.html#abc.ABCMeta.__subclasshook__ Yes, I'm experimenting with inspect for signature matching. Duck typing partisans would question what the point of such an elaborate mechanism would be when it won't change the fact that your type errors will still occur at run-time and be of essentially the same character as if you didn't use such a mechanism in the first place. The point is that this way I might identify ducktypes - at runtime - in a way that doesn't clutter code. getattr() blocks are simply boring. Of course the runtime exception-check approach might work as well (call the method and see whether it crashes) and I may finally pick that approach, but I'd like not to clutter my code with explicit try...except blocks. The very same approach might help. The chance for signature mismatch is of course high when using extreme runtime dynamic proxies (methods with *args, **kwargs signature), but at least I won't try faking static typing. Anything I fetch would just be runtime information. -- Alan Franzoni -- contact me at public@[mysurname].eu -- http://mail.python.org/mailman/listinfo/python-list
Behaviour-based interface/protocol implementation?
Hello, I'd like to have a system which lets me do certain actions if the duck-type of a certain objects matches what I expect, i.e. I'd like to have a formalization of what it's sometimes done through getattr() calls: if getattr(myobj, somemethod, None) is not None: myobj.somemethod(somevalue) The above approach is sometimes too naive, because a) clutters code with many getattr calls and ifs b) I might want to check for multiple attributes and c) only checks for the method name and not for the method's signature. After looking at PyProtocols, zope.interface and python's own abc module, I'm left with a doubt: does any behaviour-based interface testing system exist for Python? I mean: all these three libraries use a register-based or inheritance-based approach; in abc, if I want instances of a class of mine FooClass to be BarInterface instances, I can either a) inherit from BarInterface or b) run BarInterface.register(FooClass). This poses some issues in a purely duck-typed context, IMHO. If an object perfectly satisfies the BarInterface signature, but it doesn't inherit from MyInterface and its class wasn't registered as a BarInterface implementor, the check isinstance(myobj, BarInterface) will yield a False result. This might not be a big deal if a) python = 2.6 is used b) just checking for builtin interfaces - e.g. those defined in the collections module is required and c) you just require checking on basic types or on python builtin types (which correctly register builtin ABCs). What happens if I define my own ABC for my own purpose? There might be builtin objects, or third party libraries, which already offer objects that satisfy such interface, but I'd need to import such modules and register such classes as implementing my ABC, which is suboptimal. What I'd like to do is: class MyType(object): def someMethod(self, a, b): pass def otherMethod(self): pass class OtherType(object): def someMethod(self): pass def otherMethod(self): pass @DuckType class MyDuckType(object): def someMethod(self, a, b): pass def otherMethod(self): pass class TestDuckTypes(TestCase): def test_mytype_is_compatible_with_ducktype(self): myobj = MyType() self.assertEquals(True, MyDuckType.maybe_implemented_by(myobj)) def test_othertype_is_not_compatible_with_ducktype(self): myobj = OtherType() self.assertEquals(False, MyDuckType.maybe_implemented_by(myobj)) I'd like to do a kind of runtime-check for signatures. Of course there couldn't be an absolute certainty of interface implementation, because a runtime dynamic proxy method (accepting *args and **kwargs in its signature, as an example) might just fool my signature check. So, my questions are: a) does anything like that already exist in the python ecosystem? b) can anybody see any flaw either in what I'd like to do (you shouldn't do that because...) or in the way I want to do it (It won't work because...) -- Alan Franzoni -- contact me at public@[mysurname].eu -- http://mail.python.org/mailman/listinfo/python-list
abc for generators?
Hello, I was looking for an ABC for generators in python. While there's a types.GeneratorType type object - which can't be used directly and it's not an abc - and many collections-related ABCs in the collections module, there's no way to say a user-defined class as a generator, even though it could expose the very same interface as a builtin, yield-based generator. I think it would be pretty useful. comments? -- Alan Franzoni contact me at pub...@[mysurname].eu -- http://mail.python.org/mailman/listinfo/python-list
Re: abc for generators?
On 5/19/10 7:24 PM, Carl Banks wrote: collections.Iterator That would just support the next() method. But enhanced generators interface - supporting coroutines as well - include send(), throw() and close(). -- Alan Franzoni contact me at pub...@[mysurname].eu -- http://mail.python.org/mailman/listinfo/python-list
Re: debugger on system with Python 2 and 3
On 11/27/09 6:17 PM, Yo Sato wrote: Hi, I am a relative newcomer to the Python language, and only write Python 3. Now I would very much like to a more-than-basic debugger. However it seems as if the fact that I have both Python 2 and 3 on the system complicates the matter... You haven't told OS which OS you're using, and what are your exact problems, BTW I think two good debuggers for Python are winpdb/rpdb2 (work on any platform, despite the name) and the one you get in Eclipse+Pydev. You should be able to pick your platform, even though I've never tested them in Python 3. -- Alan Franzoni contact me at pub...@[mysurname].eu -- http://mail.python.org/mailman/listinfo/python-list
Re: Using setup.py for an application, not a library module.
On 11/18/09 9:53 PM, John Nagle wrote: Most of the documentation for setup.py assumes you're packaging a library module. (Ref: http://docs.python.org/distutils/setupscript.html;) How do you properly package an application? What happens on setup.py install? Where does the application get installed? Where does the main program go? Usually, just package the lib and from your main program (e.g. the script that goes in /usr/bin, for instance), do just something like that: #!/usr/bin/python from mylib import main import sys sys.exit(main()) -- Alan Franzoni contact me at pub...@[mysurname].eu -- http://mail.python.org/mailman/listinfo/python-list
Re: Pyfora, a place for python
On 11/2/09 3:44 PM, Diez B. Roggisch wrote: Being from germany, I can say that we *have* this fragmentation, and frankly: I don't like it. I prefer my communication via NNTP/ML, and not with those visually rather noisy and IMHO suboptimal forums. E.g. it That's right... forums, although more accessible to all the people who can't/doesn't want to use specific email or nntp clients, are quite slow to use. But I think Ubuntu forums support threads and are kind of channeled between ML and webinterface... something like Google Groups; I think THAT would be a good idea. What about trying to channel comp.lang.python and a forum? -- Alan Franzoni contact me at pub...@[mysurname].eu -- http://mail.python.org/mailman/listinfo/python-list
Re: Aaaargh! global name 'eggz' is not defined
On 10/29/09 9:48 PM, kj wrote: How can one check that a Python script is lexically correct? You can use a pseudo-static analyzer like pyflakes, pylint or pydoctor. Or, better, you can avoid wild imports, excessive local or global namespace manipulation, and break you program in smaller parts and write unit tests for them. Typos are very common but should very easy to catch. If you're not catching them until a very long run of your program, then your code coverage is probably too low. -- Alan Franzoni contact me at pub...@[mysurname].eu -- http://mail.python.org/mailman/listinfo/python-list
Re: Python Socket Issues with VirtualBox
TechieInsights was kind enough to say: [cut] You're giving very few details on your issue, which is most probably not related to python itself. Which operating system? Which virtualbox version? Which kind of connection? Is the port open for listen? Does the code fail at listening or at connecting (e.g. is either the client or the server failing) ? My first guess would be that you didn't specify the interface to bind to, and the interface order changes once you install virtualbox since it possibly adds a virtual interface of its own, but I can't tell unless you tell something more. -- Alan Franzoni alan.franzoni.x...@gmail.com - Remove .xyzz from my email in order to contact me. - GPG Key Fingerprint: 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
PyCon Italy 2009: Late Bird Deadline
The late-bird registration deadline for PyCon Tre (PyCon Italy 2009) is May 4th. The conference will take place in Florence from May 8th till May 10th 2009, and features guests like Guido Van Rossum, Alex Martelli, Raymond Hettinger, Fredrik Lundh and Antonio Cangiano. Feel free to take a look at the schedule: http://www.pycon.it/pycon3/schedule/ A simultaneous interpretation service is available for the main track: http://www.pycon.it/pycon3/non-italians See you in Florence! -- Alan Franzoni alan.franzoni.x...@gmail.com - Remove .xyzz from my email in order to contact me. - GPG Key Fingerprint: 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
PyCon Italy 2009: Late Bird Deadline
The late-bird registration deadline for PyCon Tre (PyCon Italy 2009) is May 4th. The conference will take place in Florence from May 8th till May 10th 2009, and features guests like Guido Van Rossum, Alex Martelli, Raymond Hettinger, Fredrik Lundh and Antonio Cangiano. Feel free to take a look at the schedule: http://www.pycon.it/pycon3/schedule/ A simultaneous interpretation service is available for the main track: http://www.pycon.it/pycon3/non-italians See you in Florence! -- Alan Franzoni alan.franzoni.x...@gmail.com - Remove .xyzz from my email in order to contact me. - GPG Key Fingerprint: 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: Why can function definitions only use identifiers, and not attribute references or any other primaries?
Jeremy Banks was kind enough to say: Hi. I'm sure there've been debates about this before, but I can't seem to figure out what to search for to pull them up, so I'm asking here. I'm not exactly sure what you mean... if you want to add functions to another fuction, just do it this way: def foo(): return i'm the main function. foo.bar = lambda: i'm the bar attr print foo() print foo.bar() def foo.bar(): return(I'm a method!) So you'd just like some syntactic sugar to let function declarations to be shorter? I think this wouldn't make the language that clear. In order to accomplish what you want, you could just use a class and the __call__ method for the main function. I think that what you really mean is that you would like an improved lambda or different def. E.g., that could you write anonymous functions ( or ruby-like code blocks ) in a different way. Something like this: d[func] = def pippo(a, b, c): ... ... ... I suppose the reason behind this is that it's not really needed. There're plenty of ways to do this sort of things in python; if you just declare methods in a class you can just use the plain def in order to achieve this, and you can inherit from your container and specialize some methods in order to achieve results which are similar to those you want. -- Alan Franzoni alan.franzoni.x...@gmail.com - Remove .xyzz from my email in order to contact me. - GPG Key Fingerprint: 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
PyCon Italy 2009: Early Bird Deadline
The early-bird registration deadline for PyCon Tre (PyCon Italy 2009) is April 13th, just a few days from now. The conference will take place in Florence from May 8th till May 10th 2009, and features guests like Guido Van Rossum, Alex Martelli, Raymond Hettinger, Fredrik Lundh and Antonio Cangiano. Feel free to take a look at the schedule: http://www.pycon.it/pycon3/schedule/ A simultaneous interpretation service is available for the main track: http://www.pycon.it/pycon3/non-italians See you in Florence! -- Alan Franzoni alan.franzoni.x...@gmail.com - Remove .xyzz from my email in order to contact me. - GPG Key Fingerprint: 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
PyCon Italy 2009: Early Bird Deadline
The early-bird registration deadline for PyCon Tre (PyCon Italy 2009) is April 13th, just a few days from now. The conference will take place in Florence from May 8th till May 10th 2009, and features guests like Guido Van Rossum, Alex Martelli, Raymond Hettinger, Fredrik Lundh and Antonio Cangiano. Feel free to take a look at the schedule: http://www.pycon.it/pycon3/schedule/ A simultaneous interpretation service is available for the main track: http://www.pycon.it/pycon3/non-italians See you in Florence! -- Alan Franzoni alan.franzoni.x...@gmail.com - Remove .xyzz from my email in order to contact me. - GPG Key Fingerprint: 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
PyCon Italy 2009: Early Bird Deadline
The early-bird registration deadline for PyCon Tre (PyCon Italy 2009) is April 13th, just a few days from now. The conference will take place in Florence from May 8th till May 10th 2009, and features guests like Guido Van Rossum, Alex Martelli, Raymond Hettinger, Fredrik Lundh and Antonio Cangiano. Feel free to take a look at the schedule: http://www.pycon.it/pycon3/schedule/ A simultaneous interpretation service is available for the main track: http://www.pycon.it/pycon3/non-italians See you in Florence! -- Alan Franzoni alan.franzoni.x...@gmail.com - Remove .xyzz from my email in order to contact me. - GPG Key Fingerprint: 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
PyCon Italy 2009 - Florence, May 8th-10th
PyCon Tre (http://www.pycon.it), the third edition of PyCon Italy, will take place in Florence from the 8th May to 10th May 2009. Confirmed keynote speakers so far include Guido Van Rossum, more to come. The Call for papers (http://www.pycon.it/pycon3/call-for-paper/) will be open from February, 9th, till March, 8th. Most website pages are currently available in italian only, but translations are in the way. -- Alan Franzoni alan.franzoni@gmail.com - Remove .xyz from my email in order to contact me. - GPG Key Fingerprint: 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
Re: time
Gabriel Rossetti was kind enough to say: I'm a UTC/GMT +1, I tried obtaining the UTC time, it says it's 2 hours earlier than the current time (14:59). I tried various other methods, I still get the wrong time. Does anyone have an idea with what is wrong? I don't see your IP since I'm reading this through gmane and you appear to have posted via the python ml, but if your utc+1 means Central Europe , you're proably missing the daylight saving. 17.00 CEST is 15.00 UTC during summer, when daylight saving is employed. -- Alan Franzoni [EMAIL PROTECTED] - Remove .xyz from my email in order to contact me. - GPG Key Fingerprint: 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: starting gazpacho on windows
nntpman68 was kind enough to say: [cut] I didn't check, but if c:\python25 is your python install dir, you'll very likely find it in c:\python2.5\bin or c:\python25\scripts. -- Alan Franzoni [EMAIL PROTECTED] - Remove .xyz from my email in order to contact me. - GPG Key Fingerprint: 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: email parsing
ra9ftm was kind enough to say: It is my first script on python. Don't know is it correctly uses modules, but it is working fine with specially with russian code pages and mime formated messages. Also quoted-printable and base64 encoded Some hints: 1) don't write x, use x * 10 instead; it's more readable and editable. def obrez(strMsg): for s in subStrObrez: n = string.rfind(strMsg,s) if n != -1: return strMsg[0:n] return strMsg In Python = 2.5 you can probably use the partition() method to make the former function much shorter. # Convert message header def my_get_header(str): str2= for val,encoding in decode_header(str): if encoding: str2 = str2+ val.decode(encoding)+ else: str2 = str2+ val+ return str2 I'm not 100% sure what you're doing there, BTW I'd suggest you to use as many Unicode objects as you can while working in Python, and encoding them just when you're outputting them. It'll save you many headaches. -- Alan Franzoni [EMAIL PROTECTED] - Remove .xyz from my email in order to contact me. - GPG Key Fingerprint: 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: GUI programming with python
zamil was kind enough to say: [cut] If your needs are very basic, you can stick with the tk module that comes with python. It's not really feature-packed, but it's maintained and pretty cross-platform. Otherwise, you can pick any supported widget set you like and use the proper python bindings. You didn't tell us which OS you'd work with, hence we can't tell you what's the best choice (if there's any). BTW you should be able to enjoy GTK+, QT or Swing (if using Jython on Java) or anything found in MS.NET (if using IronPython) - or you can go for wxPython as well. GUI Designers are widget-set related - I can suggest gazpacho for GTK+. -- Alan Franzoni [EMAIL PROTECTED] - Remove .xyz from my email in order to contact me. - GPG Key Fingerprint: 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: SSH utility
James Brady was kind enough to say: Hi all, I'm looking for a python library that lets me execute shell commands on remote machines. I've tried a few SSH utilities so far: paramiko, PySSH and pssh; unfortunately all been unreliable, and repeated questions on their respective mailing lists haven't been answered... Twisted conch seems to be your last chance :-) -- Alan Franzoni [EMAIL PROTECTED] - Remove .xyz from my email in order to contact me. - GPG Key Fingerprint: 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: Why doesn't import work?
ssecorp was kind enough to say: I have in Lib/site-packages a module named pdfminer. when I do import pdfminer it complains: import pdfminer If you've got a directory, that's not a module - it's a package. In order to import a directory as a package, you must create a (possibly empty) __init__.py file in that dir. then you can do something like from pdfminer import pythonfile1 or you can follow Sean's advice and export the __all__ name in order to directly access any module you like. -- Alan Franzoni [EMAIL PROTECTED] - Remove .xyz from my email in order to contact me. - GPG Key Fingerprint: 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: sip.so: undefined symbol: PyUnicodeUCS4_AsWideChar
Andreas Hinzmann was kind enough to say: I have also tried to configure python with --enable-unicode=ucs4, but it didn't help. But it should. try printing sys.maxunicode from your interpreter; if it's 2^16, then the interpreter is ucs2. If it's something more than 10 ^ 6, it's ucs4. -- Alan Franzoni [EMAIL PROTECTED] - Remove .xyz from my email in order to contact me. - GPG Key Fingerprint: 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: Strong/weak typing
[EMAIL PROTECTED] was kind enough to say: I'm writing Python as if it were strongly typed, never recycling a name to hold a type other than the original type. Is this good software engineering practice, or am I missing something Pythonic? Python *is* strongly typed. You're talking about dynamic typing, but that's not about name reuse. -- Alan Franzoni [EMAIL PROTECTED] - Remove .xyz from my email in order to contact me. - GPG Key Fingerprint: 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: Possible to have multiple loop variables?
laredotornado was kind enough to say:
How would I set up the ms1 array such that I can use three items per
object?
Use tuples. But that should depend on which values make up the key for your
mapping.
E.g.
ms1 = {('managed1':7019):8020, ('managed2':7020):8021}
ms2 = {'managed1':(7019:8020), 'managed2':(7020:8021)}
depending on what you want, and then iterate over such structure just like
Marc suggested.
Otherwise, you can create a custom class which returns three-tuples when
iterated, in such case you can just extract m, lp, ssl_lp in the for cycle
just like your example.
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Re: static variables in Python?
kj was kind enough to say: In this case, foo is defined by assigning to it a closure that has an associated variable, $x, in its scope. Is there an equivalent in Python? There've been plenty of answers, and I'm not absolutely sure about what you want... but closures are available in Python as well and you can use them, and by combining them through the partial module you can get a sort of closure factory: from functools import partial def getfunc(expensive_call, myfunc): val = expensive_call() f = partial(myfunc, val) return f you can then do something like that: f = getfunc(lambda: 1, lambda x,y:x*y) f(2) 6 -- Alan Franzoni [EMAIL PROTECTED] - Remove .xyz from my email in order to contact me. - GPG Key Fingerprint: 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: Continuous integration for Python projects
Hussein B was kind enough to say: Hi. Please correct my if I'm wrong but it seems to me that the major continuous integration servers (Hudson, CruiseControl, TeamCity ..) don't support Python based application. If you want, you can use ant as a build script, and then define the usual targets (build, dist, test), ecc. and then use xmlrunner to publish them in a junit-like format which can be read through cruisecontrol or other CI tools. -- Alan Franzoni [EMAIL PROTECTED] - Remove .xyz from my email in order to contact me. - GPG Key Fingerprint: 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: Syntax error in my script
laredotornado was kind enough to say: [cut] Indentation counts in Python. You're probably doing something wrong with whitespace/tab/carriage return. -- Alan Franzoni [EMAIL PROTECTED] - Remove .xyz from my email in order to contact me. - GPG Key Fingerprint: 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: undo a dictionary
mmm was kind enough to say:
My desire is to take a set of data items in an alpha-numeric range and
oput them into a dictionary
i.e.,
x1=1
x2=20
x3=33
to yield the dictionary
{ 'x1':1, 'x2':20, 'x3':33 }
without having to type in as above but instead invoke a function
maybe with syntax of
dd=make_dict('x1--x99')
you'll need to pass the locals() or globals() manually. Can't be done
(cleanly) otherwise. Check the following code:
import re
x1=1
x2=20
x3=30
q6=40
def make_dict(regex, nsmapping):
output_dict = {}
compiled_regex = re.compile(regex)
for key, value in nsmapping.items():
if compiled_regex.match(key):
output_dict[key] = value
return output_dict
d = make_dict(x[123], locals())
print d
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Re: write unsigned integer 32 bits to socket
Michael Torrie was kind enough to say: Of course any time you send coherent numbers over the network, I highly recommend you use what's called network byte order. In C, you'd use the htonl() call, and then when pulling it off the wire on the other end you'd use ntohl(). If you don't then you will have problems when the endianness is different between the hosts. Standard convention (even in the MS word) is to use big-ending across the network. I'm sure python has some convention in the struct module for dealing with this. Not in the struct module; such functions are available in the socket module, and should be employed indeed. -- Alan Franzoni [EMAIL PROTECTED] - Remove .xyz from my email in order to contact me. - GPG Key Fingerprint: 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: write unsigned integer 32 bits to socket
Scott David Daniels was kind enough to say: Alan Franzoni wrote: Please don't pass this misinformation along. In the struct module document, see the section on the initial character: Character Byte order Size and alignment @ nativenative = native standard little-endian standard big-endian standard !network (= big-endian) standard Sure, that's is one way to do it... but I was answering Micheal Torrie, who said: htonl() call, and then when pulling it off the wire on the other end you'd use ntohl(). If you don't then you will have problems when the htonl() and ntohl() are available in Python in the socket module, so: 1) i was just pointing the OP to the right place where to find such functions 2) they work just the same way, hence I can't see why the struct way should be the preferred one while the socket way should be misinformation :P Bye! -- Alan Franzoni [EMAIL PROTECTED] - Remove .xyz from my email in order to contact me. - GPG Key Fingerprint: 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: Python iPod challenge
Il Thu, 08 Nov 2007 08:11:27 -0600, Tim Chase ha scritto: I had similar problems. Additionally, that's pretty unpythonic code, as the correct answer would be something like That's true, but you should remember it's a linguistic experiment, not a Python programming contest. The task is not to do that thing in the best possible way, but to fill in the gaps. You should just try to understand what the original programmer did and to complete the program in such way. Real problems here lie in the webapp implementation: it should check for javascript *before* beginning the test (I have noscript enabled, and had to give permission to the site, hence it took me far more time to complete the test since I was just clicking but obtaining nothing) and should state more clearly that it just needs the number of letters as the output (this should be related to scripteaze problem) without any other character. Error messages are pretty counter-intuitive. -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. Remove .xyz from my address in order to contact me. - GPG Key Fingerprint (Key ID = FE068F3E): 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: interesting threading result..
Il Mon, 29 Oct 2007 09:08:01 -0700, Abandoned ha scritto:
I'm sorry my bad english.
King regards..
You must have messed up with something. You didn't post a working snippet
in first place, so you should do it now. I suppose you're working with some
editor or IDE which mantains the very same instance of a python interpreter
in memory; you probably have done something like
end.append(current)
at a certain point in your tests.
I converted your pseudocode to python like that:
import threading
class GetData(threading.Thread):
def __init__(self, name):
threading.Thread.__init__(self)
self.name = name
def run(self):
self.data={2:3, 3:4}
nlist = []
current = GetData(a)
nlist.append(current)
current.start()
end=[]
dd=nlist[0]
dd.join()
result=dd.data
print result
end.append(result)
print end
and I just get the result I would expect:
{2: 3, 3: 4}
[{2: 3, 3: 4}]
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Memory leak issue with complex data structure
Hello, I've got a complex data structure (graph-like). Each of my nodes may reference zero or more other nodes, internally managed by a set() object. I have a root node which is not referenced by any other node. So, I created a clear() method which is called on all children (by calling their clear() method and then clears the set with the references of the node itself. I have a serious leak issue; even though I clear all those sets and I delete all the references I can have to the current namespace, memory is not freed. I have tried the gc module and it couldn't help (I can't determine where the references are) and I tried using weakref.ref as well to connect object, but then I have problems (objects have no more references to them beside their parents, hence they get deleted). I understand it's impossibile to tell what's my problem without seeing the actual code (which I can't post) but I'm asking if there's any tool/debugger I could employ in order to track what's happening. Thanks! -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. Remove .xyz from my address in order to contact me. - GPG Key Fingerprint (Key ID = FE068F3E): 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: c[:]()
Il Wed, 30 May 2007 11:48:47 -0700, Warren Stringer ha scritto: [cut] c[:] is c True BTW, I couldn't understand your concern. Are you sure you really need many functions, and not just one function with different parametrs? In such a case you could just use the builtin func map() to achieve the very same result. Or you could define a function of your own like: def call_elems(iterable): for elem in iterable: elem() and just do call_elems(c) when needed. -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. Remove .xyz from my address in order to contact me. - GPG Key Fingerprint (Key ID = FE068F3E): 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: Basic Class/Instance Question
Il 23 May 2007 04:07:19 -0700, Siah ha scritto: Ready to go insane here. Class A, taking on a default value for a __init__ is a function, taking a default value of [], which is a list, which is a mutable object. That said, you should remember that this means that such default value is 'shared' between all instances. If you don't want that, do something like: def __init__(self, defaultvalue=None): if defaultvalue is None: defaultvalue=[] http://docs.python.org/tut/node6.html#SECTION00671 -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. Remove .xyz from my address in order to contact me. - GPG Key Fingerprint (Key ID = FE068F3E): 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: Basic Class/Instance Question
Il 23 May 2007 04:53:55 -0700, Siah ha scritto: [cut] No. It's because the *body* of the function gets evaluated every time the function is called, while the *definition* of the function gets evaluated just once, when the function is 'declared'. Your issue arises when the default value of the function (which is part of the definition, not of the body) is a mutable object, because it's the very same default value that gets modified at each time. -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. Remove .xyz from my address in order to contact me. - GPG Key Fingerprint (Key ID = FE068F3E): 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: PEP 3131: Supporting Non-ASCII Identifiers
Il Sun, 13 May 2007 17:44:39 +0200, Martin v. Löwis ha scritto: [cut] I'm from Italy, and I can say that some thoughts by Martin v. Löwis are quite right. It's pretty easy to see code that uses English identifiers and comments, but they're not really english - many times, they're just englishized versions of the italian word. They might lure a real english reader into an error rather than help him understand what the name really stands for. It would be better to let the programmer pick the language he or she prefers, without restrictions. The patch problem doesn't seem a real issue to me, because it's the project admin the one who can pick the encoding, and he could easily refuse any patch that doesn't conform to the standards he wants. BTW, there're a couple of issues that should be solved; even though I could do with iso-8859-1, I usually pick utf-8 as the preferred encoding for my files, because I found it more portable and more compatible with different editors and IDE (I don't know if I just found some bugs in some specific software, but I had problems with accented characters when switching environment from Win to Linux, especially when reading/writing to and from non-native FS, e.g. reading files from a ntfs disk from linux, or reading an ext2 volume from Windows) on various platforms. By the way, I would highly dislike anybody submitting a patch that contains identifiers other than ASCII or iso-8859-1. Hence, I think there should be a way, a kind of directive or sth. like that, to constrain the identifiers charset to a 'subset' of the 'global' one. Also, there should be a way to convert source files in any 'exotic' encoding to a pseudo-intellegibile encoding for any reader, a kind of translittering (is that a proper english word) system out-of-the-box, not requiring any other tool that's not included in the Python distro. This will let people to retain their usual working environments even though they're dealing with source code with identifiers in a really different charset. -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. Remove .xyz from my address in order to contact me. - GPG Key Fingerprint (Key ID = FE068F3E): 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
vim e autoindentazione commenti
Ciao a tutti, alla fine dopo le mille dispute emacs vs vim mi sono messo a provarli entrambi... e mi pare ora di essere diventato un vimmaro (pur se molto 'custom' in quanto lo sto rendendo un bel po' + simile a cream). Una domanda stupida. Forse è più da comp.editors. Come faccio a far sì che vim prosegua automaticamente i commenti su più righe? Ho settato la lunghezza massima della riga a 79 caratteri, fin qui tutto ok, ma quando vado a capo, anche se la riga inizia con #, vim non lo aggiunge in automatico all'inizio. Al contrario con altri tipi di file (es. Java) questa aggiunta è automatica e la trovo molto, molto comoda. Dovrei andae a intaccare il file di indentazione? o quello di sintassi? -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. Remove .xyz from my address in order to contact me. - GPG Key Fingerprint (Key ID = FE068F3E): 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: vim e autoindentazione commenti
Il Fri, 11 May 2007 13:15:01 GMT, Neil Cerutti ha scritto: :help format-comments (Spiacente per la mia scrittura difettosa. Sto utilizzando il traduttore di altavista.) Really sorry ^_^ I thought I was posting in it.comp.lang.python Thank you BTW! -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. Remove .xyz from my address in order to contact me. - GPG Key Fingerprint (Key ID = FE068F3E): 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: Can I use Python instead of Joomla?
Il 2 May 2007 13:48:45 -0700, walterbyrd ha scritto: If I wanted to build a website with forums, news feeds, galleries, event calander, document managment, etc. I do so in Joomla easily. You're using Joomla, which is a CMS written in PHP. Python is a language, you should ask 'can I use Python instead of PHP'. There are various Python CMSes lying around, you already got the link from the Python wiki. Now, you should check if they offer the same level of functionality and support that Joomla offers - and it may or may not be the case; consider that Joomla and Mambo have been around since years, while Python cmses and web frameworks are relatively young. Finally, Django is a framework, not a CMS. It is used to create websites and may be used to actually create CMSes. Now the important part: if you're not a PHP programmer, you can still use Joomla. You just download it, follow the instructions, plug in any pre-packed addon, and use it. You could probably do the very same with some of the Python CMSes around. Django is different: you must be able to program Python in order to use it. Nothing works from the beginning, since it's not a CMS: you must code it. -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. Remove .xyz from my address in order to contact me. - GPG Key Fingerprint (Key ID = FE068F3E): 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: python QT or python-GTK
Il Sun, 18 Mar 2007 11:55:47 -1000, Jon Van DeVries ha scritto: Please correct me if I'm wrong, I'm a newbie. Please understand then, that both QT and GTK+ are graphic toolkits. An IDE is a totally different thing. Also, please understand that Qt3 and Qt4 exist, and they're quite different beasts. Qt4 is fairly new. Qt is GPL or commercial, while GTK+ is LGPL. That means: if you want to use QT, you must either distribute your app under the GPL, or buy the commercial license, while you don't have this limit in GTK+. Both are cross-platform, but you should check for their actual visual performance wherever they should be employed. Also, GTK+ seems to still need an X server on macosx (don't know about QT) Both have IDEs to create GUIs; take a look at Glade or Gazpacho for GTK+. Also, remember GTK+ is a community project while QT is a fully commercial project. -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. Remove .xyz from my address in order to contact me. - GPG Key Fingerprint (Key ID = FE068F3E): 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: Python Source Code Beautifier
Il Wed, 07 Mar 2007 14:13:28 -0300, Gabriel Genellina ha scritto: __iadd__, in general, is not *required* to modify the instance in place (but should try to do that, if possible). After this code: b = a a += c you can't assert than a and b both refer to the *same* object, as before. If you need that, don't use += at all. (For a generic object, I mean. The built-in list does the right thing, of course) Surely _I_ can't, and _I_ won't. But take the opposite example. Let's say I'm using an external library, and that library's author provides any kind of 'convenience' container type he feels useful for the library's purposes, but without forcing a type constraint to the parameters passed to a certain function - as should be done in a language like python, and this container does create a copy of the object even employing incremental operators. Now, let's suppose I find that container type not useful for my purposes, *or* I have already written a different container type which mimicks a list's behaviour (adding some kind of functionality, of course). Now, let's suppose a certain function in that library should give a certain result based on the contents of that container, but without modifying the original object, but it needs to modify it in order to do some operations. if the function looks like this: def foo(container): container += [1, 2, 3] ... it might happen that the original object gets modified even when it shouldn't, depending on the actual object passed to the library. What I just mean... I don't see calling extend() to be that painful in respect to += . If there were no other way to do it, I would agree it would be useful. But if there're such methods, do we really need this syntactic sugar to introduce confusion? -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. Remove .xyz from my address in order to contact me. - GPG Key Fingerprint (Key ID = FE068F3E): 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: Python Source Code Beautifier
Il Tue, 06 Mar 2007 01:55:54 -0300, Gabriel Genellina ha scritto: The problem is that other people -not necesarily smarter and more experienced than you- may use those features, and perhaps you have to read, understand and modify some code written by someone else. So, you should at least know what a += b means, even if you are not going to use it. That's sure, and I'm in fact glad to know that by now. I still think it's risky, BTW. Python is dynamically typed, after all, and there's no 'a priori' way to know if 'a' is a list or another type, especially another container type. If we rely on duck typing, by the way, we may encounter two types quacking like ducks, flying like ducks, but in fact acting as slightly different ducks. I should remember as well, when designing a container type that I want to use in place of a list, to carefully craft an __iadd__ method which works just like the a list's own __iadd__ method; if I forget, I may introduce a subtle error. -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. Remove .xyz from my address in order to contact me. - GPG Key Fingerprint (Key ID = FE068F3E): 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: Python Source Code Beautifier
Il Sat, 03 Mar 2007 17:34:35 +1300, greg ha scritto: This was all discussed at *very* great length many years ago, and the addition of in-place operators to the language was held up for a long time until the present compromise was devised. You might not like it, but it's here to stay. Sure. I'm not a great programmer and I never thought about asking for such a removal. I'm sure that there're people smarter and more experienced than me out there designing Python, I'm glad I got it and I won't use such shortcuts on mutable objects in my own programs. At least, this is I what I think today; tomorrow, when I'm more experienced, I could think about them and say 'Hey! They're really cute, why haven't I used them before?' Bye! -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. Remove .xyz from my address in order to contact me. - GPG Key Fingerprint (Key ID = FE068F3E): 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: Python Source Code Beautifier
Il 28 Feb 2007 14:09:09 -0800, [EMAIL PROTECTED] ha scritto: Seems obvious and desirable to me. Bare = is the way you assign a name to an object; saying NAME = will rebind the name, breaking the connection between a and b. Without it, they continue to refer to the same object; extending the list (via += or .extend) mutates the object, but doesn't change which objects a and b are referencing. Well... the main problem is not with the '+=' operators themselves, it's with the 'global coherence'. I would assume then, that if the '+=' operator is assumed to modify objects in-place, it would just fail on immutable objects, wouldn't I? I mean... I don't like that. I'm not really a Python expert, I found this behaviour is documented in the language reference itself: http://docs.python.org/ref/augassign.html But... I don't know, still think it's confusing and not going to use it. -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. Remove .xyz from my address in order to contact me. - GPG Key Fingerprint (Key ID = FE068F3E): 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: Python Source Code Beautifier
Il Wed, 28 Feb 2007 07:53:47 +1100, Delaney, Timothy (Tim) ha scritto: Alan Franzoni wrote: the += operator is syntactic sugar just to save time... if one doesn't use it I don't think it's a matter of beauty. This change can have semantic differences, and so should not be done for anything except basic, immutable objects (such as integers). As such, it can't be done automatically. Yeah, that's right, it could have semantic differences, but that shouldn't be the case anyway. I mean, if I don't define an __iadd__ method, writing a += n or a = a + n is just the same, right? So, if I bother to define an __iadd__ method, I should make sure it works just the same, or I would introduce a very strange and hard-to-understand behaviour. -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. Remove .xyz from my address in order to contact me. - GPG Key Fingerprint (Key ID = FE068F3E): 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: Python Source Code Beautifier
Il 27 Feb 2007 16:14:20 -0800, [EMAIL PROTECTED] ha scritto: Those mean different things: a=[1] b=a a += [2] a [1, 2] b [1, 2] a=[1] b=a a = a + [2] a [1, 2] b [1] This is a really nasty one! I just answered to Tim above here, and then I saw your example... I had never realized that kind of list behaviour. That's probably because i never use + and += on lists (i prefer the more explicit append() or extend() and i do copy list explictly when I want to) , BTW I think this behaviour is tricky! -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. Remove .xyz from my address in order to contact me. - GPG Key Fingerprint (Key ID = FE068F3E): 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: Eric on XP for Newbie
Il 28 Feb 2007 08:13:42 -0800, [EMAIL PROTECTED] ha scritto: [cut] Forget the tars. http://www.quadgames.com/download/pythonqt/ Get the two EXEs here. BTW, I don't think Eric3 is a really good IDE on Windows (yet). Try something like SPE, or Scite, or any other editor like UltraEdit32. N.B: you need first to install python, then pyqtgpl, then eric. -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. Remove .xyz from my address in order to contact me. - GPG Key Fingerprint (Key ID = FE068F3E): 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: gtk.mainquit is deprecated
Il 27 Feb 2007 01:56:33 -0800, awalter1 ha scritto: But I don't want to quit the application, I need only to close the window. My application includes others places where self.window.destroy() instruction is used and the execution is done without warning. Very strange. But does then the application end, as if gtk.main_quit() were called? If it's the case, it's very likely you connected the 'destroy' signal on that very window and you set gtk.mainquit() as the callback. -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. Remove .xyz from my address in order to contact me. - GPG Key Fingerprint (Key ID = FE068F3E): 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: Python Source Code Beautifier
Il Tue, 27 Feb 2007 09:45:42 +0100, Franz Steinhaeusler ha scritto: Hello, I did not find any reasonable pyhton source code beautifier program (preferable gui). Well, most of the things you ask should be written as such, not written and then beautified! Use Spaces, size: 4 Your editor should support this. convert structs like: if (a b): to if a b: Well... that's a matter of fact, not just style. Sometimes parentheses help the reading; if a,b are not just plain names but somewhat complex instructions, parentheses should stay. fill in spaces, but not in functions between operators: a+=1 = a += 1 p(t + 1) = p(t+1) Code should be written this way. self.scriptcount = self.scriptcount + 1 = self.scriptcount += 1 the += operator is syntactic sugar just to save time... if one doesn't use it I don't think it's a matter of beauty. from is to == and is not to != (ok a find replace could do that easily also), but in a program that would be more comfortable. what? No, I think you're missing the difference between 'is' and '=='. You could say it the other way for None, True, False, e.g. if there's a 'a == None' it could be safely converted to 'a is None', but again: this should be done while writing the code. break long lines (in a reasonable way) well... this could be useful sometimes, but again... 'reason' is usually something human beings should employ, and shouldn't be 'outsourced' to computer programs. make from: if len(string) 0: = if string: and if if len(string) 1 orr if string == = if not string That's impossibile! Python is dynamically typed! How could the 'beautifier' understand what the 'string' name is bound to? It could be whatever object! detect mixed line ending detect tabs mixed with space trim trailing whitespaces. Those are editor tasks. Get a good Editor or IDE. You haven't told us what OS are you on. If you're on Windows, UltraEdit can do most of the things you'd like. And don't rely on a software to correct human behaviours ^_^. -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. Remove .xyz from my address in order to contact me. - GPG Key Fingerprint (Key ID = FE068F3E): 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: The Python interactive interpreter has no command history
Il Thu, 15 Feb 2007 15:14:00 -0200, Eduardo EdCrypt O. Padoan ha scritto: Are you using Ubuntu? The last comes with 2.4.x and 2.5. This only occurs on 2.5. This happens when you compile Python with libreadline installed, AFAIK. I'm on Edgy and command history works well both with 2.4 and 2.5 with my config. If it's really an Edgy glitch, it must be configuration-related! -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. Remove .xyz from my address in order to contact me. - GPG Key Fingerprint (Key ID = FE068F3E): 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: Ubunu - Linux - Unicode - encoding
Il Thu, 01 Feb 2007 16:02:52 +0100, Franz Steinhaeusler ha scritto: The case: I have a file on a WindowsXP partition which has as contents german umlauts and the filename itself has umlauts like iÜüäßk.txt Could you please tell us a) which filesystem is that partition using (winxp may be installed on fat32 or ntfs partitions) and b) which driver are you using to read that partition (may be vfat, ntfs or fuse/ntfs-3g) and, last but not least, c) which options are passed to that driver? -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. Remove .xyz from my address in order to contact me. - GPG Key Fingerprint (Key ID = FE068F3E): 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: Ubunu - Linux - Unicode - encoding
Il Thu, 01 Feb 2007 20:57:53 +0100, Franz Steinhäusler ha scritto: If I copy files with german umlauts (äöü and strong 's' ß), these filenames are not copied properly, and that characters are replaces by little square symbols. Yes... I, myself, am italian, and I found no problem in using accented letter (òèàìù). Since you say there's a problem as well in Nautilus and other Ubuntu software, I suppose there's something wrong with your linux setup, not with Python. Or, at least: you should try solving that problem first, then check what happens with python. Try appending this options in your fstab as hda1 mount options: iocharset=iso8859-15 unmount remount and check what does happen. -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. Remove .xyz from my address in order to contact me. - GPG Key Fingerprint (Key ID = FE068F3E): 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: How to use MySQL without MySQLdb module
Jia Lu si è divertito a scrivere: Hi all. I am using a hosting space with python cgi. But this host haven't got MySQLdb installed. Are you sure there's no other mysql db interface installed? If the DB is on the very same server, it should be. If it isn't, and you'd like to access an external firewall, you should check whether the firewall of your host really allows outbound connections. If it does, you should look for (or write by yourself) a pure-python db-api implementation of mysqldb. Otherwise, you could connect directly to the port of your mysql database and just write raw sql and pull raw data from it, but this will prevent you from the chance of using more enhanced db tools like sqlalchemy, and it's highly discouraged as well as it's really prone to errors. -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. Remove .xyz from my address in order to contact me. - GPG Key Fingerprint (Key ID = FE068F3E): 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: A python IDE for teaching that supports cyrillic i/o
Kirill Simonov si è divertito a scrivere: Unfortunately, most IDEs I tried failed miserably in this respect. My test was simple: I've run the code name = raw_input(What's your name? ) # written in Russian print Hello, %s! % name # in Russian as well both from the shell and as a standalone script. This either caused a UnicodeError or just printed invalid characters. I highly dislike asking stupid questions, and this might be stupid indeed... but did you write # -*- coding: iso-8859-5 -*- or # -*- coding: koi8_r -*- (they both seem suited to the Russian language, but I don't know the difference) as the first line in your .py file? Personally, I use Eclipse+Pydev (a bit steep to learn at the beginning, and quite memory and cpu hogging since it's a java-based ide; don't use it on old/slow computers with less than 512MB RAM, and don't use version 3.2 either) and it uses that very line to recognize the actual character set employed. You may check with other encodings as well. http://docs.python.org/lib/standard-encodings.html It does work on Windows indeed. UPDATE: I tried with Eclipse+Pydev, and using koi8_r I seems to be able to simply copypaste a piece of the ixbt.com homepage in the editor I can save and use it correctly. -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. Remove .xyz from my address in order to contact me. - GPG Key Fingerprint (Key ID = FE068F3E): 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: A python IDE for teaching that supports cyrillic i/o
Kirill Simonov si è divertito a scrivere: On Sun, Nov 19, 2006 at 12:33:39PM +0100, Alan Franzoni wrote: No, I would prefer the editor to save the .py files with non-ASCII characters in UTF-8 encoding adding the BOM at the beginning of the file. This will allow the interpreted to detect the file encoding correctly and would save a teacher from explaining what an encoding is and why it is needed. You'll run into encoding problems anyway in your programmer's life. I don't think it's a workaround, try this article: http://www.joelonsoftware.com/articles/Unicode.html I think it's highly useful, you could tell that to your students. BTW, not every editor supports the BOM. Have you tried with the explicit encoding line: # -*- coding: utf-8 -*- Eclipse+Pydev seems to work with that. I'm not able to check with other editors right now, but it seems you're experiencing a simple encoding problem; your editor doesn't know which encoding you'd like to use, so it defaults to ascii or iso-8859-1 leading to such problems. -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. Remove .xyz from my address in order to contact me. - GPG Key Fingerprint (Key ID = FE068F3E): 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: Change on file
Il Tue, 24 Oct 2006 19:47:43 +0800, Fulvio ha scritto: Hello, I was thinking about use md5 check to se if a file had changes since last check. Am I correct? Is there any other light method? It's OK, but if you have a lot of files to check and they're large, and changes frequent, it could put the system under severe workload. If you just need to know if a file has changed, you can check via date/time, or if you don't trust somebody who's got access to it (because he could have manually altered the datetime) you could go for a simpler algorithm, like sfv. -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. Remove .xyz from my address in order to contact me. - GPG Key Fingerprint (Key ID = FE068F3E): 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: Compile python on Solaris 64bit
Il Thu, 12 Oct 2006 16:46:19 +0200 (CEST), Martijn de Munnik ha scritto: Hi, I want to compile python on my solaris 10 system (amd 64 bit). Just a question... AFAIK, Solaris 10 64 bit includes binaries kernels for both 64 bit and 32 bit machines. Which binaries are you actually using? I think there could be some configuration mismatch between running binaries and environment variables that could confuse the compiler. -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. Rremove .xyz from my address in order to contact me. - GPG Key Fingerprint: 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E - Blog: http://laterradeglieroi.verdiperronchi.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Converting MSWord Docs to PDF
Il Tue, 10 Oct 2006 01:27:35 -0700, [EMAIL PROTECTED] ha scritto: is it possible to convert MSword docs into PDF format? i told my future employer that i could, because i knew of the COM scripting abilites that activePython had. and i knew there was modules for PDF creation such as reportlabs. a lot depends on the availability of ms word itself on the platform you're planning to do the work, if you want the result to be perfect. There're several tools on Windows (some cheap, some freeware) like FreePDF o pdffactory, which act like 'Virtual Printers' producing a PDF file instead; you could try using Python to automate the printing process and getting the PDF output instead. Or if you've got access to Adobe Acrobat as well, you could automate the whole process via Acrobat (but it's untested, don't take it as granted). If you're doing this in Linux, you should consider something like Crossover Office in order to run ms word and convert its output. The openoffice.org based solution will surely work, but you'll heavily rely on the conversion quality of that suite. -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. Rremove .xyz from my address in order to contact me. - GPG Key Fingerprint: 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E - Blog: http://laterradeglieroi.verdiperronchi.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Dive Into Python -- Still Being Updated?
Il 22 Jul 2006 15:48:36 -0700, [EMAIL PROTECTED] ha scritto: http://diveintopython.org/getting_to_know_python/indenting_code.html The function called fib (presumably short for Fibonacci) appears to produce factorials. Anyway, 'fib' should really be called 'hem'. :) I think this is just a bad name for the function... it's not stated anywhere that it should return a Fibonacci sequence. http://diveintopython.org/native_data_types/tuples.html#odbchelper.tuplemethods I think tuples have methods, na? Well... of course they have some *special* methods, (any python object has) but they have no method of their own. I think this is pretty clear, it's employed to emphasize the contrast with the list object. BTW, you can see last update is 20 May 2004; it's right on the homepage. -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. Rremove .xyz from my address in order to contact me. - GPG Key Fingerprint: 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E - Blog: http://laterradeglieroi.verdiperronchi.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Inheritance error: class Foo has no attribute bar
Il Sun, 09 Jul 2006 04:24:01 GMT, crystalattice ha scritto:
I can't see why it's saying this because Character.__init__(self) not only
has self.attrib_dict = {} but it also calls the setAttribute method
explicitly for each attribute name. If I do a print out of the dictionary
just for Character, the attributes are listed.
Are you sure attrib_dict is a class attribute? Aren't you defining it in
charachter's __init__ method, thus making it an instance attribute?
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Re: compiling python (or ironpython) to .exe or .dll for or not for .NET
Il 28 Jun 2006 06:29:58 -0700, per9000 ha scritto: Is the newest Ironpython really as old as from 2004 July 28 (as stated on http://www.ironpython.com/)? Ironpython homepage seems long to have been abandoned. Try this: http://www.gotdotnet.com/Workspaces/Workspace.aspx?id=ad7acff7-ab1e-4bcb-99c0-57ac5a3a9742 -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. Rremove .xyz from my address in order to contact me. - GPG Key Fingerprint: 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E - Blog: http://laterradeglieroi.verdiperronchi.com -- http://mail.python.org/mailman/listinfo/python-list
Re: compiling python (or ironpython) to .exe or .dll for or not for .NET
Il 28 Jun 2006 06:29:58 -0700, per9000 ha scritto: Is the newest Ironpython really as old as from 2004 July 28 (as stated on http://www.ironpython.com/)? Sorry again, the up to date page is the following one: http://www.codeplex.com/Wiki/View.aspx?ProjectName=IronPython -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. Rremove .xyz from my address in order to contact me. - GPG Key Fingerprint: 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E - Blog: http://laterradeglieroi.verdiperronchi.com -- http://mail.python.org/mailman/listinfo/python-list
Re: performance degradation when looping through lists
Joachim Worringen on comp.lang.python said: I use Python 2.3.4 (#1, Sep 3 2004, 12:08:45) [GCC 2.96 2731 (Red Hat Linux 7.3 2.96-110)] on linux2 Check Peter Otten's answer, and remember as well that GCC 2.96 can lead to highly strange issues whenever used. -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. Rremove .xyz from my address in order to contact me. - GPG Key Fingerprint: 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: pondering about the essence of types in python
gangesmaster on comp.lang.python said: TypeError: unbound method __init__() must be called with z instance as first argument (got x instance instead) == and the question is -- WHY? I think the answer would be: because it's an instance method. Its 'contract' it's to be bound to an object of a certain class. Would you like a different behaviour, you could decorate whatever method you need. I.e., turn your example into: class z(object): @staticmethod def __init__(self): self.blah=5 class x(object): def __init__(self): z.__init__(self) y = x() And this will work as you wish. You could have used classmethod as well with a properly tuned init, of course. but __mro__ is a readonly attribute, and deriving from instances is impossible (conn.modules.wx.Frame is a PROXY to the class)... and again -- WHY? these all look like INTENTIONAL limitations. someone went around and added type checks (which are NOT pythonic) into the cPython implementation. argh. why do that? I really think this happens because Python was designed to be casualerror-safe. This approach would probably lead to many programming errors. By the way, Python was designed to *discourage* such behaviours, not to prevent them. By the way, I didn't grasp what you would really like to do. You're saying you want to derive from instances, but then I see in your sample code you're creating a *class* derived from an object (I would expect you would like to derive an instance from an instance, and to 'twist' such new instance methods to your needs, which I think can be done as well). What's the difference between that and the use of __class__ ? class z(object): @staticmethod def __init__(self): self.blah=5 @staticmethod def met_stat(self): pass @classmethod def met_cls(self): pass def met_inst(self): pass class x(object): def __init__(self): z.__init__(self) y = x() class q(y.__class__): pass r = q() This work OK to me. Unless you want to do something like making y instance attributes become q class attributes, or you would like to set y instance attributes on all q instances, which could require a bit more of code but surely can be done. This would mix up a bit the class vs instance behaviour, though, e.g. changing a derived class instance attribute which is inherited from a parent instance would lead to a global attribute change, or would 'spawn' a new instance attribute for that particular instance? def derive_from(obj): class cls(object): def __getattr(self, name): return getattr(obj, name) return cls This seems to work for deriving read-only data from instances (no way to write back data). check types. DONT. the whole point of duck-typing is you DONT CHECK THE TYPES. you just work with objects, and instead of TypeError you'd get AttribiuteError, which is much better. AAARRGGGHH. You don't HAVE TO check types if you don't want. Just use @staticmethod everywhere in your classes. I mean, a METHOD is supposed to be class-related, and it's often useful to have it as such, (unexpected errors and behaviours might rise everywhere if not so), but you're never forced to use that. -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. Rremove .xyz from my address in order to contact me. - GPG Key Fingerprint: 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: __dict__ strangeness
Georg Brandl on comp.lang.python said: It's 2.4.2, on Linux. The 2.5 SVN trunk has the same symptom. Yes, I confirm this. I think I had done something strange on my system (probably misspelled something). -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. Rremove .xyz from my address in order to contact me. - GPG Key Fingerprint: 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: __dict__ strangeness
Georg Brandl on comp.lang.python said:
d.__dict__
{}
Which Python version, on which system? I can see the properly inserted
attribute in __dict__, both with old style and new style classes.
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Re: Which GUI toolkit is THE best?
Paul Boddie on comp.lang.python said: Now, since the commercial licence is per developer, some cunning outfit could claim that only one developer wrote their product (rather than one hundred developers, say), but this would be a fairly big breach of trust (although nothing unusual in the world of commerce, I'm sure). Would a business making software for other such businesses care about such things? What kind of recourse would they have? Just one thing I don't understand: if you're developing all your software inside your company, how would they know if you already coded it or you still have to? Also, couldn't a big company buy a *single* commercial license from the beginning, build a software employing hundreds of developers using the GPL license, and then distribute the software pretending that the single developer had done everything? This would hit Trolltech anyway. I think the problem has to do with the QT license system. It's their problem, not a developer's one. Also, I suppose one of their commercial licenses provides with far lot more than a license - e.g. I think they'll offer support, design tools, additional docs and libraries. And what would then be their income if they refused to sell you a commercial license because they *know* you've already coded your app using the GPL license of Qt? You could simply throw away your app and never distribute it, and they would'nt see a cent anyway. Personally, I don't like Qt licensing, since I think there're good widget sets around that don't have such limitations, but I don't think that people at Trolltech are really trolls :-= -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. Rremove .xyz from my address in order to contact me. - GPG Key Fingerprint: 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: Which GUI toolkit is THE best?
invitro81 on comp.lang.python said: again to make a choice is difficult; is there also some guy liking pyqt is it worse or should it be avoided because of the licencing policy for qt (which I also like..)? * Which one is the most fun to program with? * Which one is the most easy to learn? * Which one looks best? * Which one is the most productive to program with? Those are all hard questions. You might as well have asked 'which is the best web framework'. It's not easy to tell ^_^ It highly depends on which tasks you're aiming at. wxPython is a pretty good 'all-round' and cross-platform library, and includes some non-graphical features. It's got a drawback: it's a wrapper for the wxwidgets library, and hence it's not very pythonic; you can solve part of its unpythonicness using wax, which is not very well documented at the time. wxGlade can be used to design GUI apps with little effort. pyGTK works well, too. Recent versions perform well and are good looking on Windows systems as well as Linux and Macs (if you provide an X server). It's very well documented (better than wxPython, in my opinion) and its license is quite permissive. It's unpythonic just like wxPython. Glade and Gazpacho can be used to design GUI apps in a visual way. pyGUI is a pyGTK-based graphic library which is designed from scratch to be pythonic. It seems very, very promising but I can't tell you if it's production-stable since I've tested it just a couple of times. It may be the funniest and more productive toolkit ever. FLTK was interesting but seems to lack maintenance and support, pyQT is a bit 'unfree' for most uses. Tkinter is quite old stuff. -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. Rremove .xyz from my address in order to contact me. - GPG Key Fingerprint: 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: Psychic bug
Il Wed, 22 Feb 2006 19:04:48 +, Jennifer Hallinan ha scritto: Genome is a string of integers in the range 0- 3, hence the conversion. Genome is a *class*, i suppose from this code, and Mutate is... an instance method, I think. And self.genome is a string like composed of integers in the 0-3 range. I would advise you to use a list in first place, and define a method (maybe __str__ or __repr__ ) in your class in order to output it as a string - I think it may make your work easier. Your code is a little unpythonic-inside. I think you're coding from a very programmer-unfriendly language :-) I don't understand your specific problem (it may be class-related but we can't know if you don't post your full code) because the code looks fine to me, e.g. it works as it should, with that line commented out. For printing, try this: print pos:%s , old value: %s, new value: %s % ( letter, gen[letter], base) in place of your two prints in the if block, it should help you. -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. To contact me, remove .xyz from my email address. - GPG Key Fingerprint: 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: yet another list compr. suggestion
palo on comp.lang.python said: The suggestion is that the same result could be achieved by [x in y if z(x)] It's just a special case... and it saves very few carachters... I don't think it would justify an update to the parser. What if you want to do something like: [str(x) for x in y if z(x)] You've got to stick to the present syntax. -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. Rremove .xyz from my address in order to contact me. - GPG Key Fingerprint: 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: MySQLdb - Query/fetch don't return result when it *theorically* should
Bernard Lebel on comp.lang.python said: I'm absolutely flabbergasted. As I told you, i think this is related to the isolation level - I really think it's a feature of the DB you're using - this way, until you commit, your database lies in in the very same state on the same connection. Suppose you make one query, and then you make another one, and you then decide, on these result, to take a certain action on your DB; in the meantime (between Q1 and Q2) another user/program/thread/connection might have done a different operation on the very same db, and so you would be getting a Q1 results from a certain state in the DB, while Q2 from a different state, thus misleading you to take an inopportune action. committing the connection syncs the state you're looking at with the actual DB state. -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. Rremove .xyz from my address in order to contact me. - GPG Key Fingerprint: 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: MySQLdb - Query/fetch don't return result when it *theorically* should
Il Wed, 18 Jan 2006 14:39:09 -0500, Bernard Lebel ha scritto: [cut] 1) It would be great if you didn't post four messages in less than an hour ^_^ 2) Your code is very long! You can't expect many people to run and read it all! You should post a very small demo program with the very same problem as your main software. It'll help us a lot. 3) IMHO your problem looks like something related to isolation levels. You should check with your DB-adapter docs about the issue. You may need to manually sync/commit the connection or the cursor. Instead of re-creating the connection, have you tried just creating a new cursor object at every query? If you want to do a quick-test, try any ORM, like sqlalchemy or sqlobject, and check the results. -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. To contact me, remove .xyz from my email address. - GPG Key Fingerprint: 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: Recursive tree list from dictionary
Il Sat, 14 Jan 2006 13:52:43 -0400, David Pratt ha scritto:
source_list =[
I don't understand what you mean by saying that 'levels of categorization
is not fixed', are there more than two keys in any dictionary?
Basically, thus, you have a list of dictionaries and you want to get a list
of lists, right? You haven't specified what order would you like the list
to be sorted, though. Maybe you would benefit from use and ordered
dictionary implementation like orderedDict, but such behaviour can be
created anyway. I would use a kind of 'helper dictionary' to map the list
position to the root element:
def convertList(dictlist):
helpdict={}
for elem in dictlist:
helpdict.setdefault(elem['parent'],[])
helpdict[elem['parent']].append(elem['title'])
return [k,v for k,v in helpdict.items() if k!='root']
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Re: Cross Compile Mips / Linux
Il 10 Jan 2006 15:31:34 -0800, [EMAIL PROTECTED] ha scritto: Hi Everyone, I trying to get a build of Python together to run on an Embedded Linux / Mips machine. You can't do that out of the box. The main reason is that the Python interpreter is run during the compilation process, and if you compile it for mips it won't, of course, run on your pc. I had found a page explaining a way of cross-compiling python, but it's old, you'll need some kind of manual work to adapt it to 2.4 (unless you're satisfied with 2.2, of course): http://www.ailis.de/~k/docs/crosscompiling/python.php Or you could try surfing debian-mips package to see if you're lucky and find a compatible package. Best of all would be to host-compile python natively on the machine. Or you could first compile a version on your PC, and then rename the executables and edit the scripts... If you're trying to compile it for an highly-embedded machine (something like Linksys WRT series or any of the AR7-based routers around) I must tell you I've tried something like that before, and I just partly succeeded: I got what I think was a working python interpreter, but those machines are so memory-limited (mine had 8MB I think) I couldn't have it work. -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. To contact me, remove .xyz from my email address. - GPG Key Fingerprint: 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: python for with double test
Il 30 Dec 2005 09:02:30 -0800, [EMAIL PROTECTED] ha scritto: hi all the is a way for doing a for with double test: what's a 'double test' exactly? :-) 'for' does no test, it just iterates over a list. If you want to execute the iteration only if f is 1, do this: if f==1: for i in range(0,10): ... if you want to use only certain values in the range, when the value of f[i] (f may be a list, a dictionary, or whatever) is 1, you can use a list comprehension: for i in [x for x in range(0,10) if f[x]==1]: of course, if you want to make it shorter, you can define a function instead of the 'for' code block and use the list comprehension directly: def myfunction(x): ... [myfunction(x) for x in range(0,10) if f[x]==1] and you'll end up with a list of the return values of myfunction. -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. To contact me, remove .xyz from my email address. - GPG Key Fingerprint: 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: Difference between ActivePython and Python.org
S.Chang on comp.lang.python said: Hi, Anyone knows the difference(s) between the Python binaries from ActiveState and Python.org? ActivePython is a 'batteries included' distro. I think it's great for Windows - it includes a lot of manuals in CHM format and the Win32 extensions. The interpreter is a compile of their own, but I don't think it to be that different from the 'official' binary. -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. Rremove .xyz from my address in order to contact me. - GPG Key Fingerprint: 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: Amara (XML) problem on Solaris
Doru-Catalin Togea wrote: AttributeError: 'module' object has no attribute 'create_document' bash-2.03$ Any ideas what is going on? I would say it's a problem with the Amara installation on Solaris. I've never used it, but maybe it's a package from another source which acts a bit differently. Also, are you sure the code is correct? I've taken a peek at the Amara's website, and the create_document() function seems to lie within the binderytools module. I think the line should look like: doc = amara.binderytools.create_document() or doc = binderytools.create_document() or simply create_document() depending on the way you imported the module, but your previous code, if really working on Windows, makes me think you did something like: import amara.binderytools as amara or something like that? Please post some more code, if you can. -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. To contact me, remove .xyz from my email address. - GPG Key Fingerprint: 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
Re: NoneType to unicode
John Morey on comp.lang.python said: I have tried using the encode() function to change the values to unicode however I cannot do this because they are returned from the id3 library as NoneType instances. which means I need to convert to a string first (which i can't do because it crashes the application) NoneType is just the type of None. It should mean that your ID3 library returns 'None' when trying to read non-ascii ID3s. I think you should check your ID3 library, not your main program. -- Alan Franzoni [EMAIL PROTECTED] - Togli .xyz dalla mia email per contattarmi. Rremove .xyz from my address in order to contact me. - GPG Key Fingerprint: 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-list
