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python Programming Glossary: andThe Python yield keyword explained http://stackoverflow.com/questions/231767/the-python-yield-keyword-explained in Python What does it do For example I'm trying to understand this code def node._get_child_candidates self distance min_dist.. I'm trying to understand this code def node._get_child_candidates self distance min_dist max_dist if self._leftchild and.. self distance min_dist max_dist if self._leftchild and distance max_dist self._median yield self._leftchild if self._rightchild..
How do you split a list into evenly sized chunks in Python? http://stackoverflow.com/questions/312443/how-do-you-split-a-list-into-evenly-sized-chunks-in-python sized chunks in Python I have a list of arbitrary length and I need to split it up into equal size chunks and operate on.. length and I need to split it up into equal size chunks and operate on it. There are some obvious ways to do this like keeping.. are some obvious ways to do this like keeping a counter and two lists and when the second list fills up add it to the first..
http://stackoverflow.com/questions/509211/pythons-slice-notation powerful but I haven't quite got my head around it and am looking for a good guide. python slice share improve this.. is not in the selected slice. So the difference beween end and start is the number of elements selected if step is 1 the default.. items than you ask for. For example if you ask for a 2 and a only contains one element you get an empty list instead of..
What is a metaclass in Python? http://stackoverflow.com/questions/100003/what-is-a-metaclass-in-python metaclasses you need to master classes in Python. And Python has a very peculiar idea of what classes are borrowed.. bar True Can be translated to Foo type 'Foo' 'bar' True And used as a normal class print Foo class '__main__.Foo' print.. print f __main__.Foo object at 0x8a9b84c print f.bar True And of course you can inherit from it so class FooChild Foo .....
How to generate all permutations of a list in Python http://stackoverflow.com/questions/104420/how-to-generate-all-permutations-of-a-list-in-python yield tuple pool i for i in indices r break else return And another based on itertools.product def permutations iterable..
Which Python memory profiler is recommended? [closed] http://stackoverflow.com/questions/110259/which-python-memory-profiler-is-recommended search shows a commercial one is Python Memory Validator . And open source ones are PySizer and Heapy . I haven't tried anyone..
The meaning of a single- and a double-underscore before an object name in Python http://stackoverflow.com/questions/1301346/the-meaning-of-a-single-and-a-double-underscore-before-an-object-name-in-python private to this class on instances of other classes. And a warning from the same page Name mangling is intended to give..
The Python yield keyword explained http://stackoverflow.com/questions/231767/the-python-yield-keyword-explained and distance max_dist self._median yield self._rightchild And this is the caller result candidates list self while candidates.. what yield does you must understand what generators are. And before generators come iterables. Iterables When you create.. of children and you don't want them all stored in memory. And it works because Python does not care if the argument of a method..
Short Description of Python Scoping Rules http://stackoverflow.com/questions/291978/short-description-of-python-scoping-rules execution when the function spam is passed somewhere else. And maybe lambda functions pass a bit differently There must be..
http://stackoverflow.com/questions/3455456/what-kinds-of-patterns-could-i-enforce-on-the-code-to-make-it-easier-to-translat probably better off just biting the bullet and doing it. And yes that's painful. I consider our tools to be extremely good.. tools to be extremely good but then I'm pretty biased . And it is still very hard to build a good translator. The difference..
Flattening a shallow list in Python http://stackoverflow.com/questions/406121/flattening-a-shallow-list-in-python list chain mi.image_set.all for mi in h.get_image_menu And as @cdleary notes it's probably better style to avoid operator..
Does Python have a built in function for string natural sort? http://stackoverflow.com/questions/4836710/does-python-have-a-built-in-function-for-string-natural-sort 'elm1' 'Elm2' 'elm9' 'elm10' 'Elm11' 'Elm12' 'elm13' And here's the sorted version of the above list what I have 'Elm11'..
What is the best way to remove accents in a python unicode string? http://stackoverflow.com/questions/517923/what-is-the-best-way-to-remove-accents-in-a-python-unicode-string or is this possible with just the python standard library And what about in python 3.0 Important note I would like to avoid..
How can you profile a Python script? http://stackoverflow.com/questions/582336/how-can-you-profile-a-python-script cProfile 1 So all I have to do is run profile euler048.py And I get this 1007 function calls in 0.061 CPU seconds Ordered..
Python rounding error with float numbers http://stackoverflow.com/questions/5997027/python-rounding-error-with-float-numbers i in range 0 n 1 a int 100 float i 100 if i a print i a And I can't see any pattern in the numbers for which this rounding..
Simple Digit Recognition OCR in OpenCV-Python http://stackoverflow.com/questions/9413216/simple-digit-recognition-ocr-in-opencv-python a simpl OCR using KNearest or SVM features in OpenCV. And below is what i did and how. it is just for learning how to.. contains a letter along with 16 features of that letter. And this SOF helped me to find it. These 16 features are explained.. 0 cv2.imshow 'im' im cv2.imshow 'out' out cv2.waitKey 0 And it worked below is the result i got Here it worked with 100..
http://stackoverflow.com/questions/1061283/lt-instead-of-cmp there's actually an even better way to provide comparison AND hashing for many classes including that in the question a __key__..
Python: removing characters except digits from string http://stackoverflow.com/questions/1450897/python-removing-characters-except-digits-from-string here is irrelevant since all essentially means identity AND deletes characters present in the second argument the key part...
Stream large binary files with urllib2 to file http://stackoverflow.com/questions/1517616/stream-large-binary-files-with-urllib2-to-file question No reason to work line by line small chunks AND requires Python to find the line ends for you just chunk it..
http://stackoverflow.com/questions/1746613/bitwise-operation-and-usage # Result 4 x 2 # Bitwise OR 0011 # Result 3 x 1 # Bitwise AND 0001 # Result 1 I can understand the arithmetic operators in.. on multi bit values but conceptually one bit at a time. AND is 1 only if both of its inputs are 1 otherwise it's 0. OR is.. one input values shown at the intersection of the inputs. AND 0 1 OR 0 1 XOR 0 1 NOT 0 1 0 0 0 0 0 1 0 0 1 1 0 1 0 1 1..
The Python yield keyword explained http://stackoverflow.com/questions/231767/the-python-yield-keyword-explained If there is still a child of the node object on its left # AND if distance is ok return the next child if self._leftchild and.. there is still a child of the node object on its right # AND if distance is ok return the next child if self._rightchild..
How are Python's Built In Dictionaries Implemented http://stackoverflow.com/questions/327311/how-are-pythons-built-in-dictionaries-implemented is occupied CPython and even PyPy compares the the hash AND the key by compare I mean comparison not the is comparison of..
*args and **kwargs? [duplicate] http://stackoverflow.com/questions/3394835/args-and-kwargs to enter lists and dictionaries as arguments of a function AND at the same time as a wildcard so I can pass ANY argument Is..
Python: How to find list intersection? http://stackoverflow.com/questions/3697432/python-how-to-find-list-intersection 1 3 5 6 expected output 1 3 5 How can we achieve a boolean AND operation list intersection on two lists Any help will be highly..
check if all elements in a list are identical http://stackoverflow.com/questions/3844801/check-if-all-elements-in-a-list-are-identical to iterate through the list compare adjacent elements and AND all the resulting Boolean values. But I'm not sure what's the..
Making moves w/ websockets and python / django ( / twisted? ) http://stackoverflow.com/questions/4363899/making-moves-w-websockets-and-python-django-twisted the view ends however after the websocket closed down AND closed the tcp socket django's WSGI implementation tries to..
Is it worth using Python's re.compile? http://stackoverflow.com/questions/452104/is-it-worth-using-pythons-re-compile 2.5 library code I see that Python internally compiles AND CACHES regexes whenever you use them anyway including calls..
Handling very large numbers in Python http://stackoverflow.com/questions/538551/handling-very-large-numbers-in-python 11 13 17 19 23 29 31 37 41 43 53 59 61 suitPrimes 2 3 5 7 AND def HashVal self return PokerCard.facePrimes self.cardFace PokerCard.suitPrimes..
SQLite Performance Benchmark — why is :memory: so slow…only 1.5X as fast as disk? http://stackoverflow.com/questions/764710/sqlite-performance-benchmark-why-is-memory-so-slow-only-1-5x-as-fast-as-d xx for xx in id2a query 'select from demo where id1 in s AND id2 in s ' id1s id2s results qq 0 round querytime conn_disk..
Creating a logging handler to connect to Oracle? http://stackoverflow.com/questions/935930/creating-a-logging-handler-to-connect-to-oracle INCLUDING # ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL # VINAY SAJIP BE LIABLE FOR ANY SPECIAL..
Python - Twisted, Proxy and modifying content http://stackoverflow.com/questions/9465236/python-twisted-proxy-and-modifying-content the browser i'd like to be able to modify ANY HTTP headers AND content content. This Need help writing a twisted proxy was..
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