Python Forum

Empty Python lists don't know the type of the items it will contain, so this sounds strange: 0 Because that may be an empty sequence of someobject: 0 In a statically typed language in that situation you may answer the

I have recently been playing with a kd-tree for solving the "post office problem" in a 12-dimensional space. This is pure cpu bound number crunching, a task for which I suspected Python to be inefficient. My prototype in Python 2.5 using NumPy required 0.41 seconds to construct the tree from 50,000 samples. Unfortunately, searching it felt...

What are OOP's Jargons and Complexities Xah Lee, 20050128 The Rise of Classes, Methods, Objects In computer languages, often a function definition looks like this: subroutine f (x1, x2, ...) { variables ... do this or that }

A work colleague circulated this interesting article about reducing software bugs by orders of magnitude: http://www.spectrum.ieee.org/WEBONLY/publicfeature/sep05/0905ext.html Some methods they talk about include removing error prone and ambiguous expressions from their ADA based language Sparc - The example they give is on why they removed...

So I wrote PyPI back a couple of years ago. It was just a simple cgi script and some distutils code. I needed to call it *something* and "Python Package Index" seemed like a fairly obvious name. Unfortunately, it's also quite a mouthful. A friend suggested "PyPI" as a good shorter name. He also indicated that it should be pronounced "Pippy"...

Where are they-who-hate-us-for-our-whitespace? Are "they" really that stupid/petty? Are "they" really out there at all? "They" almost sound like a mythical caste of tasteless heathens that "we" have invented. It just sounds like so much trivial nitpickery that it's hard to believe it's as common as we've come to believe.

I'd love the perfect editor that would be: a) free b) enable me to drag and drop code snippets from a sort of browser into the code c) can run programs right from within d) can edit

I've sent several messages over the last year asking about python - Who teaches python? Is python losing steam? etc. I have noticed, eg, the declinng number of books at my local borders. The last time I visited a borders (last week), there was 1 (sic) book about python on the shelve compared to dozens on perl & java! On my last inquiry about...

why functions created with lambda forms cannot contain statements? how to get unnamed function with statements?

Isn't there an easier way than lst = ... ?

Hi all. I have the need to store a large (10M) number of keys in a hash table, based on a tuple of (long_integer, integer). The standard python dictionary works well for small numbers of keys, but starts to perform badly for me inserting roughly 5M keys: # keys dictionary metakit (both using psyco) ------ ---------- ------- 1M ...

Is there any discussion of having real booleans in Python 3000? Say something along the line of the numpy implementation for arrays of type 'bool'? Hoping the bool type will be fixed will be fixed, Alan Isaac

I'm pretty new to Python, and even newer to Image/Video processing, and trying to get started on a project similar to GRL Vienna's laser marker. I found some sample code here http://janto.blogspot.com/2006/01/motion-capture-in-python.html, but after running the code with the included sample input file, it seems quite slow (1-2 seconds from...

Is anyone working on a python-to-native compiler? I'd be interested in taking a look. Come to think of it, is anyone working on a sexpr-enabled version of Python, or anything similar? I really miss my macros whenever I try to use it...

Please comment on the new PEP for reverse iteration methods. Basically, the idea looks like this: for i in xrange(10).iter_backwards(): # 9,8,7,6,5,4,3,2,1,0 <do something with i> The HTML version is much more readable than the ReST version. See: http://www.python.org/peps/pep-0322.html

I've recently been trying out various different GUI frameworks in Python and was wondering if I could get your input on the pros and cons of the different ones... wxPython: I love the programming side of wxPython, but I find it's just so slow to initialise in the first place. Tkinter: While it's fast to load up, the syntax has never...

I've heard 2 people complain that word 'global' is confusing. Perhaps 'modulescope' or 'module' would be better? Am I the first peope to have thought of this and suggested it? Is this a candidate for Python 3000 yet? Chris

Hi all, In some program I was testing if a variable was a boolean, with this test : if v in My script didn't work in some cases and I eventually found that for v = 0 the test returned True So I changed my test for the obvious "if type(v) is bool", but I still find it confusing that "0 in " returns True

So, Python 2.5 will have new any() and all() functions. http://www.python.org/dev/peps/pep-0356/ any(seq) returns True if any value in seq evaluates true, False otherwise. all(seq) returns True if all values in seq evaluate true, False otherwise. I have a question: what should these functions return when seq is an empty list?

Hi, I am here with placing the Sample code for reading the and Input data mentioned. Is there any best of reading the file?. Thanks in advance PSB Sampple1.txt Rect 1 1 2 7 6

From the introduction to PyObjC, the Python-Objective-C bridge on Mac OS X: "As described in Objective-C for PyObjC users the creation of Objective-C objects is a two-stage process. To initialize objects, first call a class method to allocate the memory (typically alloc), and then call an initializer (typically starts with init). Some...

I'm stuck trying to write a function that generates a factorial of a number using iteration and not recursion. Any simple ideas would be appreciated.

do i dare to open a thread about this? come on you braver men we are at least not bought by g***le but why? others have said it so many times i think :-////

my file is of the form 01 "\t" 10.19 "\t" 0.00 "\t" 10.65 02 "\t" 11.19 "\t" 10.12 "\t" 99.99 and i need to access the individual floating point numbers from it! say for ex. the first no is 10.19.. i want to access this and add one to it. ...

Hi all, is true parallelism possible in python ? or atleast in the coming versions ? is global interpreter lock a bane in this context ? regards, KM