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python Programming Glossary: theseWhat is a metaclass in Python? http://stackoverflow.com/questions/100003/what-is-a-metaclass-in-python classes are objects. Well metaclasses are what create these objects. They are the classes' classes you can picture them.. time you need class alteration you are better off using these. But 99 of the time you don't need class alteration at all...
Get last n lines of a file with Python, similar to tail http://stackoverflow.com/questions/136168/get-last-n-lines-of-a-file-with-python-similar-to-tail trying to finesse alignment with physical OS blocks. Using these high level I O packages I doubt you'll see any performance consequence..
Differences between isinstance() and type() in python http://stackoverflow.com/questions/1549801/differences-between-isinstance-and-type-in-python and type in python What are the differences between these two code fragments Which way is considered to be more pythonic..
http://stackoverflow.com/questions/1746613/bitwise-operation-and-usage into the top 4 bits of an 8 bit value. The simply combines these two together. If val1 is 7 and val2 is 4 val1 val2 15 and..
How do I watch a file for changes using Python? http://stackoverflow.com/questions/182197/how-do-i-watch-a-file-for-changes-using-python
Decode HTML entities in Python string? http://stackoverflow.com/questions/2087370/decode-html-entities-in-python-string rather not have to resort to lxml in order to interpret these escaped characters can anyone provide a way of doing this with..
The Python yield keyword explained http://stackoverflow.com/questions/231767/the-python-yield-keyword-explained is being iterated It's a concise way to go through all these nested data even if it's a bit dangerous since you can end up..
Print in terminal with colors using Python? http://stackoverflow.com/questions/287871/print-in-terminal-with-colors-using-python use images of the classic PC font. You can find some of these bitmaps that you can use on the Dwarf Fortress Wiki see user..
Short Description of Python Scoping Rules http://stackoverflow.com/questions/291978/short-description-of-python-scoping-rules names not attributes. If you reference it without a period these rules apply LEGB Rule. L. Local. Names assigned in any way within..
*args and **kwargs? [duplicate] http://stackoverflow.com/questions/3394835/args-and-kwargs separate keyword arguments and the values become values of these arguments. To be honest I don't understand and don't get for.. 'vegetable' cabbage vegetable apple fruit You can use these along with named arguments too. The explicit arguments get values..
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 and I want to write a single expression that returns these two dictionaries merged. The update method would be what I need..
Flattening a shallow list in Python http://stackoverflow.com/questions/406121/flattening-a-shallow-list-in-python a community wiki in case others want to add to or correct these observations. My original reduce statement is redundant and.. for image in mi.image_set.all But neither of these methods are as efficient as using itertools.chain from itertools..
Converting string into datetime http://stackoverflow.com/questions/466345/converting-string-into-datetime 1 2005 1 33PM Aug 28 1999 12 00AM I'm going to be shoving these back into proper datetime fields in a database so I need to..
How to install pip on windows? http://stackoverflow.com/questions/4750806/how-to-install-pip-on-windows . Most Python applications and other free software respect these. Example syntax http proxy_url port http username password@proxy_url..
Lazy Method for Reading Big File in Python? http://stackoverflow.com/questions/519633/lazy-method-for-reading-big-file-in-python file and read next piece. Is there any method to yield these pieces I would love to have a lazy method . python file io..
Old style and new style classes in Python http://stackoverflow.com/questions/54867/old-style-and-new-style-classes-in-python in Python Is there ever a reason to use old style classes these days python class types new style class share improve this.. details in addition to what type returns. Some of these changes are fundamental to the new object model like the way..
What is a metaclass in Python? http://stackoverflow.com/questions/100003/what-is-a-metaclass-in-python some people are just more comfortable using __init__ . These are called metaclasses damn it It must mean something Why the..
How to remove convexity defects in a Sudoku square? http://stackoverflow.com/questions/10196198/how-to-remove-convexity-defects-in-a-sudoku-square pixel intersection and calculate the center of the result. These points are the grid line intersections centerOfGravity l_ ComponentMeasurements..
Python normal arguments vs. keyword arguments http://stackoverflow.com/questions/1419046/python-normal-arguments-vs-keyword-arguments and you don't even have to specify what those names are. These are pure keyword arguments and can't be passed positionally...
“Large data” work flows using pandas http://stackoverflow.com/questions/14262433/large-data-work-flows-using-pandas and store it in a permanent on disk database structure. These files are typically too large to fit in memory. In order to..
http://stackoverflow.com/questions/1746613/bitwise-operation-and-usage it's 0. NOT is 1 only if its input is 0 otherwise it's 0. These can often be best shown as truth tables. Input possibilities..
Why is numpy's einsum faster than numpy's built in functions? http://stackoverflow.com/questions/18365073/why-is-numpys-einsum-faster-than-numpys-built-in-functions loop All of the above are twice as fast with np.einsum . These should be apples to apples comparisons as everything is specifically..
Getting method parameter names in python http://stackoverflow.com/questions/218616/getting-method-parameter-names-in-python are in the beginning of aMethod.func_code.co_varnames These are implementation details of CPython so this probably does..
The Python yield keyword explained http://stackoverflow.com/questions/231767/the-python-yield-keyword-explained use for... in... on is an iterable lists strings files... These iterables are handy because you can read them as much as you..
Is False == 0 and True == 1 in Python an implementation detail or is it guaranteed by the language? http://stackoverflow.com/questions/2764017/is-false-0-and-true-1-in-python-an-implementation-detail-or-is-it-guarante ... Booleans bool and in the boolean subsection Booleans These represent the truth values False and True ... Boolean values..
Short Description of Python Scoping Rules http://stackoverflow.com/questions/291978/short-description-of-python-scoping-rules Python Scope resolution from Learning Python 3rd. Ed. . These rules are specific to variable names not attributes. If you..
http://stackoverflow.com/questions/3455456/what-kinds-of-patterns-could-i-enforce-on-the-code-to-make-it-easier-to-translat on top of frameworks which I will also have to write . These frameworks will embrace an MVC design pattern and follow strict..
http://stackoverflow.com/questions/3684484/peak-detection-in-a-2d-array where I used Excel to draw the areas I want to 'detect'. These are 2 by 2 boxes around the sensor with local maxima's that..
Python/Tkinter: Interactively validating Entry widget content http://stackoverflow.com/questions/4140437/python-tkinter-interactively-validating-entry-widget-content have Tk pass in special values to your validate command. These values give you all the information you need to know to decide..
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 all. So we need a library or program that actually works. These are variously in ASCII ISO 8859 1 UTF 8 Microsoft CP1252 or..
How do you create a daemon in Python? http://stackoverflow.com/questions/473620/how-do-you-create-a-daemon-in-python handy for checking if the daemon is already running etc. These samples both explain how to create the daemon. Are there any..
http://stackoverflow.com/questions/7933596/django-dynamic-model-fields cost Will stability of application suffer upon heavy use These are the questions to be considered. You need to be sure to maintain..
How do you validate a URL with a regular expression in Python? http://stackoverflow.com/questions/827557/how-do-you-validate-a-url-with-a-regular-expression-in-python like Do you want to remove the query string Or preserve it These are not RFC specified validations. These are validations unique.. Or preserve it These are not RFC specified validations. These are validations unique to your application. share improve this..
Python: simple list merging based on intersections http://stackoverflow.com/questions/9110837/python-simple-list-merging-based-on-intersections print timeit.timeit merge_alexis lsts setup setup number 3 These timings are obviously dependent on the specific parameters to..
Simple Digit Recognition OCR in OpenCV-Python http://stackoverflow.com/questions/9413216/simple-digit-recognition-ocr-in-opencv-python of that letter. And this SOF helped me to find it. These 16 features are explained in the paper Letter Recognition Using..
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