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python Programming Glossary: thatWhat is a metaclass in Python? http://stackoverflow.com/questions/100003/what-is-a-metaclass-in-python In most languages classes are just pieces of code that describe how to produce an object. That's kinda true in Python.. object at 0x8974f2c But classes are more than that in Python. Classes are objects too. Yes objects. As soon as.. manually. Remember the function type The good old function that lets you know what type an object is print type 1 type 'int'..
The Python yield keyword explained http://stackoverflow.com/questions/231767/the-python-yield-keyword-explained and end calculating 4 one by one. Yield Yield is a keyword that is used like return except the function will return a generator... you know your function will return a huge set of values that you will only need to read once. To master yield you must understand.. need to read once. To master yield you must understand that when you call the function the code you have written in the..
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 chunks share improve this question Here's a generator that yields the chunks you want def chunks l n Yield successive n..
http://stackoverflow.com/questions/509211/pythons-slice-notation through not past end by step The key point to remember is that the end value represents the first value that is not in the.. remember is that the end value represents the first value that is not in the selected slice. So the difference beween end and.. selected if step is 1 the default . The other feature is that start or end may be a negative number which means it counts..
What is a metaclass in Python? http://stackoverflow.com/questions/100003/what-is-a-metaclass-in-python pieces of code that describe how to produce an object. That's kinda true in Python too class ObjectCreator object ... pass.. Everything and I mean everything is an object in Python. That includes ints strings functions and classes. All of them are.. cls .__new__ cls clsname bases uppercase_attr That's it. There is really nothing more about metaclasses. The reason..
Remove items from a list while iterating in Python http://stackoverflow.com/questions/1207406/remove-items-from-a-list-while-iterating-in-python he wants the 'determine' to say what should be deleted. That would then be just. somelist x for x in somelist if not determine..
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 while a.foo only expects 1 argument. a is bound to foo . That is what is meant by the term bound below print a.foo # bound..
How can I attach a pyplot function to a figure instance? http://stackoverflow.com/questions/14254379/how-can-i-attach-a-pyplot-function-to-a-figure-instance also in some other figure that is generated in parallel. That is very annoying. Is there any way to attach the contour pyplot..
What do (lambda) function closures capture in Python? http://stackoverflow.com/questions/2295290/what-do-lambda-function-closures-capture-in-python pointer to the integer object currently pointed to by i . That means that when i assigned a new integer object it shouldn't..
Unexpected feature in a Python list of lists http://stackoverflow.com/questions/240178/unexpected-feature-in-a-python-list-of-lists When you write x 3 you get essentially the list x x x . That is a list with 3 references to x . When you then change x all..
http://stackoverflow.com/questions/2709821/python-self-explained of methods is the instance the method is called on. That makes methods entirely the same as functions and leaves the.. entirely everywhere it does do it for instance attributes. That's why assigning to an instance attribute needs to know what..
Is it Pythonic to use bools as ints? http://stackoverflow.com/questions/3174392/is-it-pythonic-to-use-bools-as-ints just feel free to use them without contortions. That goes for indexing arithmetic bit operations etc etc etc. share..
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 thread catch a specific exception and perform the cleanup. That way you can interrupt a task and still have proper cleanup...
http://stackoverflow.com/questions/3455456/what-kinds-of-patterns-could-i-enforce-on-the-code-to-make-it-easier-to-translat lines of translated program you already don't understand. That takes a huge amount of effort. At the million line level this..
How to improve performance of this code? http://stackoverflow.com/questions/4295799/how-to-improve-performance-of-this-code fCamel fCamel fCamel gap bCamel bCamel bCamel bCamel That is just for 3 camels each. I wanted to do this for 4 at least... for 3 camels each. I wanted to do this for 4 at least. That test case is still running It's been about 5 minutes now . I'll..
Extending the User model with custom fields in Django http://stackoverflow.com/questions/44109/extending-the-user-model-with-custom-fields-in-django of doing this is through a OneToOneField User property. That said extending django.contrib.auth.models.User also works better..
Regular expression to detect semi-colon terminated C++ for & while loops http://stackoverflow.com/questions/524548/regular-expression-to-detect-semi-colon-terminated-c-for-while-loops bracket and decrement it when you see a closing bracket. That will increment it once at the beginning for the first opening..
What are some good Python ORM solutions? [closed] http://stackoverflow.com/questions/53428/what-are-some-good-python-orm-solutions use the ORM if you want without having to import the rest. That said if I were already using CherryPy for the web layer and..
Security of Python's eval() on untrusted strings? http://stackoverflow.com/questions/661084/security-of-pythons-eval-on-untrusted-strings trust the string In particular Is eval string f Foo unsafe That is can you reach os or sys or something unsafe from a Foo instance.. something unsafe from a Foo instance Is eval string unsafe That is can I reach os or sys entirely from builtins like len and..
Creating a singleton in python http://stackoverflow.com/questions/6760685/creating-a-singleton-in-python Principle each class should do only one thing . That way you don't have to worry about messing up one thing the code.. Now there is one kind of Singleton which is OK. That is a singleton where all of the reachable objects are immutable...
Circular (or cyclic) imports in Python http://stackoverflow.com/questions/744373/circular-or-cyclic-imports-in-python that module whether or not it has completed executing. That is the reason why cyclic imports may return modules which appear..
Adding a Method to an Existing Object http://stackoverflow.com/questions/972/adding-a-method-to-an-existing-object of choice do this If so how UPDATE 8 04 2008 00 21 01 EST That looks like a good answer John Downey I tried it but it appears..
http://stackoverflow.com/questions/13893287/python-time-limit LOOP WILL NOT STOP UNTIL IT FINISHES AND WE DISCOVER THAT WE ARE PAST OUR DEADLINE. THE TASK NEEDS TO BE INTERRUPTED IN..
“Large data” work flows using pandas http://stackoverflow.com/questions/14262433/large-data-work-flows-using-pandas can optionally specify # columns a list of the columns IN THAT GROUP if you wanted to # select only say 3 out of the 20 columns..
How to correct bugs in this Damerau-Levenshtein implementation? http://stackoverflow.com/questions/3431933/how-to-correct-bugs-in-this-damerau-levenshtein-implementation # ARRAYS THAT SAY SIZE # cdef class Array_of_unsigned_int cdef unsigned..
Python/Django download Image from URL, modify, and save to ImageField http://stackoverflow.com/questions/3445568/python-django-download-image-from-url-modify-and-save-to-imagefield RGB # resize could occur here # START OF CODE THAT DOES NOT SEEM TO WORK # I need to somehow convert an image ....... a file that the Django object will accept. # END OF CODE THAT DOES NOT SEEM TO WORK my_model_instance.image.save 'some_filename'..
Multi threaded web scraper using urlretrieve on a cookie-enabled site http://stackoverflow.com/questions/6111372/multi-threaded-web-scraper-using-urlretrieve-on-a-cookie-enabled-site mechanize.urljoin SiteBase link .read file.close But THAT fails because opener I think wants to move the binary file back..
http://stackoverflow.com/questions/62567/ignore-case-in-python-strings libc.strcasecmp THIS this returns 0 libc.strcasecmp THIS THAT returns 8 may also want to reference strcasecmp documentation..
How to translate this Math Formula in Haskell or Python? (Was translated in PHP) http://stackoverflow.com/questions/8605183/how-to-translate-this-math-formula-in-haskell-or-python-was-translated-in-php A 50 BOUNTY IF SOMEONE WANTS TO HELP ME BY TRANSLATING THAT FORMULA IN PHP. Note that if you think that translating in Python..
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