🌐 Mailman 3 April 2010 - Python-list - python.org

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by emely April 1, 2010

April 1, 2010

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no module named exceptions?
by Joaquin Abian April 1, 2010

April 1, 2010

In python 3.1, >>> import exceptions Traceback (most recent call last): File "<pyshell#6>", line 1, in <module> import exceptions ImportError: No module named exceptions in 2.6 no exception is raised It should be the same in 3.1, isnt it? Joaquin

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by emely April 1, 2010

April 1, 2010

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by emely April 1, 2010

April 1, 2010

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Python 3.1, object, and setattr()
by Ethan Furman April 1, 2010

April 1, 2010

Greetings! Perhaps I woke up too early this morning, but this behaviour has me baffled: Python 3.1.1 (r311:74483, Aug 17 2009, 17:02:12) [MSC v.1500 32 bit (Intel)] on win32 Type "help", "copyright", "credits" or "license" for more information. --> test = object() --> setattr(test, 'example', 123) Traceback (most recent call last): File "<stdin>", line 1, in <module> AttributeError: 'object' object has no attribute 'example' Shouldn't setattr() be creating the 'example' attribute? Any tips greatly appreciated! ~Ethan~

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Re: Python 3.1, object, and setattr()
by Steve Howell April 1, 2010

April 1, 2010

On Apr 1, 6:46 am, Ethan Furman <et...(a)stoneleaf.us> wrote: > Greetings! > > Perhaps I woke up too early this morning, but this behaviour has me baffled: > > Python 3.1.1 (r311:74483, Aug 17 2009, 17:02:12) [MSC v.1500 32 bit > (Intel)] on win32 > Type "help", "copyright", "credits" or "license" for more information. > > --> test = object() > > --> setattr(test, 'example', 123) > Traceback (most recent call last): > File "<stdin>", line 1, in <module> > AttributeError: 'object' object has no attribute 'example' > > Shouldn't setattr() be creating the 'example' attribute? Any tips > greatly appreciated! > On 2.6.2 the error seems to be limited to instances of object. If you subclass object, you are fine. I do not know why that is so; I'm just verifying that the behavior you see is not limited to 3.1.1. Python 2.6.2 (release26-maint, Apr 19 2009, 01:56:41) [GCC 4.3.3] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> class Foo(object): pass ... >>> test = Foo() >>> setattr(test, 'example', 123) >>> test.example 123 >>> test = object() >>> setattr(test, 'example', 123) Traceback (most recent call last): File "<stdin>", line 1, in <module> AttributeError: 'object' object has no attribute 'example' It's probably good to subclass object anyway, with something like: class Record(object): pass But I do not know your use case.

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Re: decorators only when __debug__ == True
by Steven D'Aprano April 1, 2010

April 1, 2010

On Thu, 01 Apr 2010 00:27:51 +0100, MRAB wrote: >>> A decorator shouldn't call the function it's decorating. >> >> *raises eyebrow* >> >> Surely, in the general case, a decorator SHOULD call the function it is >> decorating? I'm sure you know that, but your wording is funny and could >> confuse the OP. >> > What I mean is that the function that's doing the decorating shouldn't > call the function; it's the locally-defined wrapper function that calls > the decorated function. Ah, gotcha, that makes sense. Now I understand the distinction you were making. Thank you for the clarification. -- Steven

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Q: We have *args and **kwargs. Woud ***allargs be useful?
by Jonathan Fine April 1, 2010

April 1, 2010

The idioms def f(*args, **kwargs): # Do something. and args = (1, 2, 3) kwargs = dict(a=4, b=5) g(*args, **kwargs) are often useful in Python. I'm finding myself picking up /all/ the arguments and storing them for later use (as part of a testing framework). So for me it would be nice if I could write def f(***allargs): args, kwargs = allargs # Continue as before. However, if we do this then 'args' in '*args' is misleading. So I'll use 'sargs' (for sequence arguments) instead. I can now write, for a suitable class Args args = Args(1, 2, 3, a=4, b=5) g(***args) # Same as before. sargs, kwargs = args g(*sargs, **kwargs) # Same as before. Even better, now that Args is a class we can give it a method 'call' so that args.call(g) is equivalent to g(***args) which removes the need for the *** construct. This reminds me of functools.partial except, of course, we've fixed all the arguments and left the passing of the function for later, whereas in partial we fix the function and some of the arguments. http://docs.python.org/library/functools.html#functools.partial My view are that 1. Conceptually ***allargs is useful, but an Args class would be more useful (not that it need be either-or). 2. If Args were built in , there could be performance benefits. 3. It's clearer to write def(*seqargs, **kwargs): than def(*args, **kwargs): 4. When the Args class is used a lot, one might welcome def(***args): # Do something with args. as a shortcut (and minor speedup) for def(*seqargs, **kwargs): args = Args(*seqargs, **kwargs) # Do something with args. I look forward to your comments on this. -- Jonathan

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Re: Developement Question?
by KB April 1, 2010

April 1, 2010

On Apr 1, 3:34 am, Wayne <infotech...(a)fairpoint.net> wrote: > My town office uses Microsoft operating system. They have a proprietary > accounting system that uses excel for their accounting reports. > I would like to read these report and reproduce the report so that > the report can be seen on the web. I was thinking about using xlrd and > xlwt along with some sort of software for building the web pages. I > use linux only and do not use Microsoft. > Q. Does python have to be installed on there computer to run the script? > > Q. Am I approaching this the wrong way? If so, what would be a better > approach? Wayne, check out google group python-excel. They are very helpful there, and I believe there are threads on how to compile what you are looking for into a .exe for just such a situation (Disclaimer: I am far from an expert, so I may have misunderstood from the python-excel thread if python is/isn't required on the target machine once the .exe is built, but try that group - John Machin is very responsive)

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