¡@
python Programming Glossary: butWhat is a metaclass in Python? http://stackoverflow.com/questions/100003/what-is-a-metaclass-in-python Python concepts well let's say they're just OO concepts but this one is tricky. I know it has something to do with introspection.. tricky. I know it has something to do with introspection but it's still unclear to me. So what are metaclasses What do you.. assign it to a variable you can copy it you can add attributes to it you can pass it as a function parameter e.g. print ObjectCreator..
The Python yield keyword explained http://stackoverflow.com/questions/231767/the-python-yield-keyword-explained are handy because you can read them as much as you wish but you store all the values in memory and it's not always what.. have a lot of values. Generators Generators are iterators but you can only iterate over them once . It's because they do not.. mygenerator ... print i 0 1 4 Here it's a useless example but it's handy when you know your function will return a huge set..
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 list and empty the second list for the next round of data but this is potentially extremely expensive. I was wondering if.. 991..999 I was looking for something useful in itertools but I couldn't find anything obviously useful. Might've missed it..
http://stackoverflow.com/questions/509211/pythons-slice-notation needs a bit of picking up. It looks extremely powerful but I haven't quite got my head around it and am looking for a good..
What is a metaclass in Python? http://stackoverflow.com/questions/100003/what-is-a-metaclass-in-python print my_object __main__.ObjectCreator object at 0x8974f2c But classes are more than that in Python. Classes are objects too... objects the instances and this is why it's a class . But still it's an object and therefore you can assign it to a variable.. an object from this class __main__.Foo object at 0x89c6d4c But it's not so dynamic since you still have to write the whole..
http://stackoverflow.com/questions/13058458/python-list-index The results I expected are 0 0 0 0 0 1 1 1 0 1 1 1 0 1 1 1 But the actual results from Python are 0 1 1 1 0 1 1 1 0 1 1 1 0.. value so they operate independently a 1 b a a 2 print b 1 But since lists might get pretty large rather than shifting the..
Difference between __str__ and __repr__ in Python http://stackoverflow.com/questions/1436703/difference-between-str-and-repr-in-python is a and b is b but I got a null C using default default_c But you have to do the last step make sure every object you implement..
How do I ensure that re.findall() stops at the right place? http://stackoverflow.com/questions/17765805/how-do-i-ensure-that-re-findall-stops-at-the-right-place re.findall r' title . title ' s # 'aaa' 'aaa2' 'aaa3' But really consider using BeautifulSoup or lxml or similar to parse..
The Python yield keyword explained http://stackoverflow.com/questions/231767/the-python-yield-keyword-explained pass a list to it a 1 2 b 3 4 a.extend b print a 1 2 3 4 But in your code it gets a generator which is good because You don't.. typing and is one of the reason why Python is so cool. But this is another story for another question... You can stop here..
Flattening a shallow list in Python http://stackoverflow.com/questions/406121/flattening-a-shallow-list-in-python menuitem.image_set.all for menuitem in list_of_menuitems But I get in trouble of the NameError variety there because the.. list x call there because x is a Django QuerySet object. But the reduce method is fairly unreadable. So my question is Is.. for mi in list_of_menuitems for image in mi.image_set.all But neither of these methods are as efficient as using itertools.chain..
How do you remove duplicates from a list in Python whilst preserving order? http://stackoverflow.com/questions/480214/how-do-you-remove-duplicates-from-a-list-in-python-whilst-preserving-order x return output Thanks to unwind for that code sample . But I'd like to avail myself of a built in or a more Pythonic idiom..
Python rounding error with float numbers http://stackoverflow.com/questions/5997027/python-rounding-error-with-float-numbers that python returns float 29 100 as 0.28999999999999998. But that isn't a systematic error not in the sense it happens to..
How to compile and link multiple python modules (or packages) using cython? http://stackoverflow.com/questions/11507101/how-to-compile-and-link-multiple-python-modules-or-packages-using-cython naive way I get an extension Module4.so which I can import BUT the extension relies on the python source code of Module1 Module2..
Python interface for R Programming Language http://stackoverflow.com/questions/11716923/python-interface-for-r-programming-language not a comment on them rather on the merits of rpy2 itself. BUT do not expect that there will be an easy way of using R in Python..
http://stackoverflow.com/questions/13058458/python-list-index it you get four pointers to the same place in memory. BUT when you change one of the values then Python knows that the..
http://stackoverflow.com/questions/1382998/latin-1-to-ascii x .encode 'ASCII' 'specials' this gives the right output BUT python mtimeit s'import a' 'a.bu ' 100000 loops best of 3 10.7..
time.sleep() required to keep QThread responsive? http://stackoverflow.com/questions/14665636/time-sleep-required-to-keep-qthread-responsive to get a fast enough screen update with MatPlotLib BUT the problem is that unless I use put the threaded process to..
Python - Get a list of all the encodings python can encode to http://stackoverflow.com/questions/1728376/python-get-a-list-of-all-the-encodings-python-can-encode-to if instead of aliases.keys you use set aliases.values . BUT THERE'S A WORSE PROBLEM aliases doesn't contain codecs that..
http://stackoverflow.com/questions/1766669/python-unicodedecodeerror error using latin1 'Ha x9aek'.decode 'latin1' u'Ha x9aek' BUT U 009A is a control character SINGLE CHARACTER INTRODUCER i.e...
Simultaneous record audio from mic and play it back with effect in python http://stackoverflow.com/questions/17711672/simultaneous-record-audio-from-mic-and-play-it-back-with-effect-in-python I play this back it will say hello twice a delay effect. BUT there is a time interval of 'empty space' between both hellos..
how to use matplotlib in django? http://stackoverflow.com/questions/1874642/how-to-use-matplotlib-in-django from the internet I made the test code below. It works ... BUT if I reload the page the pie will draw itself in the same image...
when does Python allocate new memory for identical strings? http://stackoverflow.com/questions/2123925/when-does-python-allocate-new-memory-for-identical-strings s &rArr each string Arizona ... is stored only once fine. BUT write the list to disk and read it back in again the same list..
The Python yield keyword explained http://stackoverflow.com/questions/231767/the-python-yield-keyword-explained i 0 1 4 It is just the same except you used instead of . BUT you can not perform for i in mygenerator a second time since..
Checking whether a variable is an integer or not http://stackoverflow.com/questions/3501382/checking-whether-a-variable-is-an-integer-or-not behaves like an int instead of mandating that it be one. BUT The classical Python mentality though is that it's easier to..
How do I get the UTC time of “midnight” for a given timezone? http://stackoverflow.com/questions/373370/how-do-i-get-the-utc-time-of-midnight-for-a-given-timezone 0 minute 0 second 0 microsecond 0 .astimezone pytz.utc BUT there is a bigger problem than aesthetics in your code it will..
How can I assign a new class attribute via __dict__ in python? http://stackoverflow.com/questions/432786/how-can-i-assign-a-new-class-attribute-via-dict-in-python test test.value 5 a.value # 5 test.__dict__ 'value' # 5 # BUT attr_name 'next_value' test.__dict__ attr_name 10 # 'dictproxy'..
Merging a list of time-range tuples that have overlapping time-ranges http://stackoverflow.com/questions/5679638/merging-a-list-of-time-range-tuples-that-have-overlapping-time-ranges # This will ensure that a b c d e f ... and a c e ... # BUT the order of b d f ... is still random # Now we have only 3..
Programmatically `git checkout .` with dulwich http://stackoverflow.com/questions/6640546/programmatically-git-checkout-with-dulwich HEAD commit.id I end up with the commit in the history BUT the created file is pending for deletion git status says so..
Dynamically set local variable in Python http://stackoverflow.com/questions/8028708/dynamically-set-local-variable-in-python and assignments to the dictionary change the variables BUT that's only if you explicitly call locals under that name. If..
How to render my select field with WTForms? http://stackoverflow.com/questions/8463421/how-to-render-my-select-field-with-wtforms self.data NOTE THIS IS NOT TESTED NOR EVEN RUN PYTHON CODE BUT A VERY QUICK HACK GIVEN THE QUESTION AND THE UNDERLYING CODE..
How to integrate SQLAlchemy and a subclassed Numpy.ndarray smoothly and in a pythonic way? http://stackoverflow.com/questions/8940802/how-to-integrate-sqlalchemy-and-a-subclassed-numpy-ndarray-smoothly-and-in-a-pyt sa.String unique True # HERE how to access DTONumpy BUT as MyNumpy Objects in a way that MyNumpy # is smoothly integrated..
http://stackoverflow.com/questions/960963/trie-prefix-tree-in-python unique and thus imply different modifications of the Trie. BUT is it really that complex Am I missing something Is there a..
|