Python Forum

Hi! I wonder which editor or IDE you can recommend me for writing Python programs. I tried with jEdit but it isn't perfect.

Just as a pedantic exercise to try and understand Python a bit better, I decided to try to make a generator or class that would allow me to unpack an arbitrary number of calculatible values. In this case, just zeros (though I just to prove whatever ends up working, having a counting generator would be nice). The target syntax would be...

The following script puzzles me. It creates two nested lists that compare identically. After identical element assignments, the lists are different. In one case, a single element is replaced. In the other, an entire column is replaced. --------------------------------------------------------------------------------------- ''' An...

Has anybody tried to run parallel python applications? It appears that if your application is computation-bound using 'thread' or 'threading' modules will not get you any speedup. That is because python interpreter uses GIL(Global Interpreter Lock) for internal bookkeeping. The later allows only one python byte-code instruction to be executed...

Python 2.5 (r25:51908, Sep 19 2006, 09:52:17) on win32 Type "help", "copyright", "credits" or "license" for more information. Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: can only concatenate tuple (not "list") to tuple Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError:...

I'd like to check, for a filehandle f, that EOF has been reached on it. What's the way to do it? I don't want to try/except on EOF, I want to check, after I read a line, that now we're in the EOF state. In Ruby it's f.eof: In Ruby: =#<File:jopa> ="jopa\n" =true

Dear all, I have encountered this weird problem. I have a class definition with an __init__ argument 'd' which defaults to {}. This argument is put in the 'self.d' attribute at initialization I create two independent instances of this class; the code is as follows.

Suppose you have the time and the money to start a new project in Python. What would you like to do? I can think of: - A civilization like game in Python, with multiplayer support via twisted. - An easy to use tool for drawing diagrams, typically various kinds of arrows and circles and boxes, that produces nice .eps and .svg files.

"Nine Language Performance Round-up: Benchmarking Math & File I/O" http://www.osnews.com/story.php?news_id=5602 I think this is an unfair comparison! I wouldn't dream of developing a numerical application in Python without using prebuilt numerical libraries and data objects such as dictionaries and lists. I have been experimenting with...

Tuples are defined with regards to parentheses ()'s as everyone knows. This causes confusion for 1 item tuples since (5) can be interpreted as a tuple OR as the number 5 in a mathematical expression such as x = (5) * (4+6). Wouldn't it have been better to define tuples with <>'s or {}'s or something else to avoid this confusion?? ...

Please ignore if you are allergic to ramblings :-) Despite a puritan streak I've always tried to refrain from language wars or syntax bickering; call it enforced pragmatism. That's the main reason why I've liked Python: it's elegant and simple and still dynamic and flexible. You could do worse for a clean and pragmatic language. I do know...

here's a large exercise that uses what we built before. suppose you have tens of thousands of files in various directories. Some of these files are identical, but you don't know which ones are identical with which. Write a program that prints out which file are redundant copies. Here's the spec. -------------------------- The program is...

A small software team (developers, leads and even the manager when he's had time) has been using (wx)Python/PostgreSQL for over 2 years and developed a successful 1.0 release of a client/server product. A marketing/product manager has brought in additional management and "architecture" experts to propose moving the entire thing to a Java...

Hello everybody! I have little problem: class A: def __init__(self, n): self.data = n def f(self, x = ????) print x All I want is to make self.data the default argument for self.f(). (I

As far as I know, Perl is known as "there are many ways to do something" and Python is known as "there is only one way". Could you please explain this? How is this possible and is it *really* a good concept?

Is Python going to support s syntax the does not use it's infamous whitespace rules? I recall reading that Python might include such a feature. Or, maybe just a brace-to-indentation preprocessor would be sufficient. Many people think Python's syntax makes sense. There are strong feelings both ways. It must depend on a person's way of...

In Python, it is possible to multiply a string with a number: >>> "hello"*3 'hellohellohello' However, you can't multiply a string with another string: >>> 'hello'*'world' Traceback (most recent call last): File "<interactive input>", line 1, in ?

Now i began to learn GUI programming. There are so many choices of GUI in the python world, wxPython, pyGTK, PyQT, Tkinter, .etc, it's difficult for a novice to decide, however. Can you draw a comparison among them on easy coding, pythonish design, beautiful and generous looking, powerful development toolkit, and sufficient documentation,...

Hi, I'm in the process of writing some code and noticed a strange problem while doing so. I'm working with PythonWin 210 built for Python 2.5. I noticed the problem for the last py file processed by this script, where the concerned tmp file is only actually written to when PythonWin is closed. In other words, after I run this script, one of...

I have a class which is not intended to be instantiated. Instead of using the class to creating an instance and then operate on it, I use the class directly, with classmethods. Essentially, the class is used as a function that keeps state from one call to the next. The problem is that I don't know what to call such a thing! "Abstract class"...

Hello all, First of all, my present state of mind re pep 318 is one of sheepish confusion. I suspect pep 318 will not affect Leo significantly, but I am most surprised that an apparently controversial feature is being added without a notice, say, in comp.lang.python.announce. I say sheepish, because everyone knows that one should make...

I am new to the Python language. How do I do something like this: I know that a = 3 y = "a" print eval(y)

hello, i'm trying to understand how i could build following consecutive sets from a root one using generator : l = would like to produce : , , , ,

Can anybody please give me a decent justification for this: class A(object): def __init__(self, a): self.a = a def __eq__(self, other): return self.a == other.a s = A(3)

Having read previous discussions on python-dev I think I'm not the only Python programmer who doesn't particularly like python's "self" parameter: class Foo: def bar(self, a,b): return a+b Foo().bar(1,2) => 3 The main reason (at least for me) is that there's simply too much