python Programming Glossary: we

http://stackoverflow.com/questions/100003/what-is-a-metaclass-in-python

in Python I've mastered almost all the Python concepts well let's say they're just OO concepts but this one is tricky... Python has a very peculiar idea of what classes are borrowed from the Smalltalk language. In most languages classes are.. object at 0x8997cec You'll notice that we use MyShinyClass as the name of the class and as the variable..

Fastest way to list all primes below N in python

http://stackoverflow.com/questions/2068372/fastest-way-to-list-all-primes-below-n-in-python

there is no guarantee that numbers.pop will remove the lowest number from the set. Nevertheless it works at least for me.. 15.9 primesfrom3to 18.4 ambi_sieve 29.3 Timings were measured using the command python mtimeit s import primes.. 29 else 0 tmp const del_mult tmptk off start prime # now we go back to top tk1 so we need to increase pos by 1 pos 1 cpos..

The Python yield keyword explained

http://stackoverflow.com/questions/231767/the-python-yield-keyword-explained

spaces. This is the link to the complete source http well adjusted.de ~jrschulz mspace . python iterator generator.. it from the list node candidates.pop # Get the distance between obj and the candidate distance node._get_dist obj # If distance.. an iterable and adds its values to the list. Usually we pass a list to it a 1 2 b 3 4 a.extend b print a 1 2 3 4 But..

Is there any way to kill a Thread in Python?

http://stackoverflow.com/questions/323972/is-there-any-way-to-kill-a-thread-in-python

has created several other threads that must be killed as well. The nice way of handling this if you can afford it if you.. check the stop flag at regular intervals. They are cases however when you really need to kill a thread for example when you.. raise threading.ThreadError the thread is not active # do we have it cached if hasattr self _thread_id return self._thread_id..

Python: How do I pass a variable by reference?

http://stackoverflow.com/questions/986006/python-how-do-i-pass-a-variable-by-reference

passed in is a reference to outer_list not a copy of it we can use the mutating list methods to change it and have the.. in the outer scope. Now let's see what happens when we try to change the reference that was passed in as a parameter.. the_list print 'got' the_list the_list 'and' 'we' 'can' 'not' 'lie' print 'set to' the_list outer_list 'we' 'like'..

What is a metaclass in Python?

http://stackoverflow.com/questions/100003/what-is-a-metaclass-in-python

print type ObjectCreator class '__main__.ObjectCreator' Well type has a completely different ability it can also create.. right But we learned that Python classes are objects. Well metaclasses are what create these objects. They are the classes'.. why the heck is it written in lowercase and not Type Well I guess it's a matter of consistency with str the class that..

Is there any way to run Python on Android?

http://stackoverflow.com/questions/101754/is-there-any-way-to-run-python-on-android

project. But Java is not my favourite language at all. We are working on a S60 version and this platform has a nice Python..

Reading binary file in Python

http://stackoverflow.com/questions/1035340/reading-binary-file-in-python

2.6 this is not needed. In Python 3 it's a bit different. We will no longer get raw characters from the stream in byte mode..

Validate SSL certificates with Python

http://stackoverflow.com/questions/1087227/validate-ssl-certificates-with-python

expired that they are issued for the correct address etc. We use our own internal corporate Certificate Authority for these..

Wrapping a C library in Python: C, Cython or ctypes?

http://stackoverflow.com/questions/1942298/wrapping-a-c-library-in-python-c-cython-or-ctypes

implemented the functions we needed about 15 functions . We were previously using a third party module PyUSB for the same..

python random string generation with upper case letters and digits

http://stackoverflow.com/questions/2257441/python-random-string-generation-with-upper-case-letters-and-digits

'G5G74W' id_generator 3 6793YUIO 'Y3U' How does it work We import string a module that contains sequences of common ASCII..

Solving embarassingly parallel problems using Python multiprocessing

http://stackoverflow.com/questions/2359253/solving-embarassingly-parallel-problems-using-python-multiprocessing

of calculations to a file database tcp connection etc. . We can parallelize the program in two dimensions Part 2 can run..

What kinds of patterns could I enforce on the code to make it easier to translate to another programming language?

http://stackoverflow.com/questions/3455456/what-kinds-of-patterns-could-i-enforce-on-the-code-to-make-it-easier-to-translat

a much bigger task for real languages than you expect. We have some 100 man years invested in just DMS and another 6 12..

How to reliably guess the encoding between MacRoman, CP1252, Latin1, UTF-8, and ASCII

http://stackoverflow.com/questions/4198804/how-to-reliably-guess-the-encoding-between-macroman-cp1252-latin1-utf-8-and

with the thousands of files in our codebase named .txt . We want to rename all of them to fit into our new standard. But.. between those the three different 8 bit encodings. We probably have over a thousand MacRoman files alone so whatever..

Python list comprehension rebind names even after scope of comprehension. Is this right?

http://stackoverflow.com/questions/4198906/python-list-comprehension-rebind-names-even-after-scope-of-comprehension-is-thi

creator of Python explaining the history behind this We also made another change in Python 3 to improve equivalence..

Open document with default application in Python

http://stackoverflow.com/questions/434597/open-document-with-default-application-in-python

we're still depending on the retcode in either case. We don't need to wait for the child process since we're by problem..

Driving Excel from Python in Windows

http://stackoverflow.com/questions/441758/driving-excel-from-python-in-windows

Excel from Python in Windows We have various spreadsheets that employ deliciously complicated..

Does python have an equivalent to Java Class.forName()?

http://stackoverflow.com/questions/452969/does-python-have-an-equivalent-to-java-class-forname

4 22 a datetime.datetime 2010 4 22 0 0 How does that work We're using __import__ to import the module that holds the class.. lives in foo.baz module then m will be the module foo We can easily obtain a reference to foo.baz using getattr m 'baz'..

Using strides for an efficient moving average filter

http://stackoverflow.com/questions/4936620/using-strides-for-an-efficient-moving-average-filter

a view into the same memory as the original 10x10 array. We could have just as easily used different filter size along different.. a 4 dimensional array would give us a 6 dimensional view . We can then apply an arbitrary function to the last axis repeatedly..

Python __init__ and self what do they do?

http://stackoverflow.com/questions/625083/python-init-and-self-what-do-they-do

methods it will be passed automatically as in ... a A # We do not pass any argument to the __init__ method a.method_a 'Sailor.. any argument to the __init__ method a.method_a 'Sailor ' # We only pass a single argument The __init__ method is roughly what..

Simple Digit Recognition OCR in OpenCV-Python

http://stackoverflow.com/questions/9413216/simple-digit-recognition-ocr-in-opencv-python

numpy computer vision ocr share improve this question Well I decided to workout myself on my question to solve above.. to train the data For testing purposes we do as follows a We load the image used for testing b process the image as earlier..