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python Programming Glossary: returnsWhat is a metaclass in Python? http://stackoverflow.com/questions/100003/what-is-a-metaclass-in-python MyClass choose_class 'foo' print MyClass # the function returns a class not an instance class '__main__.Foo' print MyClass #.. manually this way MyShinyClass type 'MyShinyClass' # returns a class object print MyShinyClass class '__main__.MyShinyClass'.. __init__ # it's the method that creates the object and returns it # while __init__ just initializes the object passed as parameter..
What is the difference between @staticmethod and @classmethod in Python? http://stackoverflow.com/questions/136097/what-is-the-difference-between-staticmethod-and-classmethod-in-python staticmethod even though it is a method a.static_foo just returns a good 'ole function with no arguments bound. static_foo expects..
Why does comparing strings in Python using either '==' or 'is' sometimes produce a different result? http://stackoverflow.com/questions/1504717/why-does-comparing-strings-in-python-using-either-or-is-sometimes-produce is var2 which fails but if I change it to var1 var2 it returns True . now if I open my python interpreter and do the same is..
Finding local IP addresses using Python's stdlib http://stackoverflow.com/questions/166506/finding-local-ip-addresses-using-pythons-stdlib socket.gethostname This won't work always returns 127.0.0.1 on machines having the hostname in etc hosts as 127.0.0.1..
http://stackoverflow.com/questions/19151/build-a-basic-python-iterator they provide two methods __iter__ and next . The __iter__ returns the iterator object and is implicitly called at the start of.. implicitly called at the start of loops. The next method returns the next value and is implicitly called at each loop increment...
Decode HTML entities in Python string? http://stackoverflow.com/questions/2087370/decode-html-entities-in-python-string £682m So I'm trying to produce the same string that lxml returns when I do the second print. I'd rather not have to resort to..
How does zip(*[iter(s)]*n) work in Python? http://stackoverflow.com/questions/2233204/how-does-zipitersn-work-in-python if s is 1 2 3 4 5 6 7 8 9 and n is 3 zip iter s n returns 1 2 3 4 5 6 7 8 9 . How exactly does this work I'm not sure..
The Python yield keyword explained http://stackoverflow.com/questions/231767/the-python-yield-keyword-explained in the function body does not run. The function only returns the generator object this is a bit tricky Then your code will..
Calling a function from a string with the function's name in Python http://stackoverflow.com/questions/3061/calling-a-function-from-a-string-with-the-functions-name-in-python how to do it by using eval to define a temp function that returns the result of that function call but I'm hoping that there is..
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 0 raise ValueError invalid thread id elif res 1 # if it returns a number greater than one you're in trouble # and you should..
How can I merge (union) two Python dictionaries in a single expression? http://stackoverflow.com/questions/38987/how-can-i-merge-union-two-python-dictionaries-in-a-single-expression dictionaries and I want to write a single expression that returns these two dictionaries merged. The update method would be what..
Old style and new style classes in Python http://stackoverflow.com/questions/54867/old-style-and-new-style-classes-in-python in a number of important details in addition to what type returns. Some of these changes are fundamental to the new object model..
Convert XML/HTML Entities into Unicode String in Python http://stackoverflow.com/questions/57708/convert-xml-html-entities-into-unicode-string-in-python have a utility that takes a string with HTML entities and returns a unicode type For example I get back #x01ce which represents..
Python rounding error with float numbers http://stackoverflow.com/questions/5997027/python-rounding-error-with-float-numbers 0.29 same with .57 and .58 the reason being that python returns float 29 100 as 0.28999999999999998. But that isn't a systematic..
Replacements for switch statement in python? http://stackoverflow.com/questions/60208/replacements-for-switch-statement-in-python in python I want to write a function in python that returns different fixed values based on the value of an input index...
How can I make a chain of function decorators in Python? http://stackoverflow.com/questions/739654/how-can-i-make-a-chain-of-function-decorators-in-python
Circular (or cyclic) imports in Python http://stackoverflow.com/questions/744373/circular-or-cyclic-imports-in-python a module does exist in sys.modules then an import simply returns that module whether or not it has completed executing. That..
Using numpy to build an array of all combinations of two arrays http://stackoverflow.com/questions/1208118/using-numpy-to-build-an-array-of-all-combinations-of-two-arrays of. out ndarray Array to place the cartesian product in. Returns out ndarray 2 D array of shape M len arrays containing cartesian..
python image recognition [closed] http://stackoverflow.com/questions/1603688/python-image-recognition Cookbook great resource btw def gauss_kern size sizey None Returns a normalized 2D gauss kernel array for convolutions size int..
http://stackoverflow.com/questions/1827489/numpy-meshgrid-in-3d 1 D arrays representing the x and y coordinates of a grid. Returns X Y ndarray For vectors `x` `y` with lengths ``Nx len x ``..
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 way to list all primes below n in python 3035188#3035188 Returns a list of primes n sieve True n for i in xrange 3 int n 0.5.. way to list all primes below n in python 3035188#3035188 Returns a list of primes n sieve True n 2 for i in xrange 3 int n 0.5.. all primes below n in python 3035188#3035188 Input n 6 Returns a list of primes 2 p n correction n 6 1 n 0 n 1 n 1 2 n 4 3..
Simple implementation of N-Gram, tf-idf and Cosine similarity in Python http://stackoverflow.com/questions/2380394/simple-implementation-of-n-gram-tf-idf-and-cosine-similarity-in-python need For the cosine_similarity def cosine_distance u v Returns the cosine of the angle between vectors v and u. This is equal..
How do I perform HTML decoding/encoding using Python/Django? http://stackoverflow.com/questions/275174/how-do-i-perform-html-decoding-encoding-using-python-django function for reference def escape html Returns the given HTML with ampersands quotes and carets encoded. return.. reversed to avoid symmetric problems def html_decode s Returns the ASCII decoded version of the given HTML string. This does..
How to stream an HttpResponse with Django http://stackoverflow.com/questions/2922874/how-to-stream-an-httpresponse-with-django for x in range 1 11 yield s n x # Returns a chunk of the response to the browser time.sleep 1 python..
http://stackoverflow.com/questions/3684484/peak-detection-in-a-2d-array image and detect the peaks usingthe local maximum filter. Returns a boolean mask of the peaks i.e. 1 when the pixel's value is..
How can I improve my paw detection? http://stackoverflow.com/questions/4087919/how-can-i-improve-my-paw-detection coded_paws return data_slices def paw_file filename Returns a iterator that yields the time and data in each frame The infile..
http://stackoverflow.com/questions/4098131/matplotlib-update-a-plot plt.figure ax fig.add_subplot 111 line1 ax.plot x y 'r ' # Returns a tuple of line objects thus the comma for phase in np.linspace..
Efficient Numpy 2D array construction from 1D array http://stackoverflow.com/questions/4923617/efficient-numpy-2d-array-construction-from-1d-array to add rolling window to window int Size of rolling window Returns Array that is a view of the original array with a added dimension..
Increment a python floating point value by the smallest possible amount http://stackoverflow.com/questions/6063755/increment-a-python-floating-point-value-by-the-smallest-possible-amount ctypes.c_double ctypes.c_double def nextafter x y Returns the next floating point number after x in the direction of y...
Rolling or sliding window iterator in Python http://stackoverflow.com/questions/6822725/rolling-or-sliding-window-iterator-in-python examples from itertools import islice def window seq n 2 Returns a sliding window of width n over data from the iterable s s0..
Detect & Record Audio in Python http://stackoverflow.com/questions/892199/detect-record-audio-in-python FORMAT pyaudio.paInt16 RATE 44100 def is_silent snd_data Returns 'True' if below the 'silent' threshold return max snd_data THRESHOLD..
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