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python Programming Glossary: you'dWhat can you use Python generator functions for? http://stackoverflow.com/questions/102535/what-can-you-use-python-generator-functions-for and occasionally report back to the caller. Traditionally you'd use a callback function for this. You pass this callback to..
Is there any pythonic way to combine two dicts (adding values for keys that appear in both)? http://stackoverflow.com/questions/11011756/is-there-any-pythonic-way-to-combine-two-dicts-adding-values-for-keys-that-appe of dict so you can still do everything else with them you'd normally do with that type such as iterate over their keys and..
How to debug in Django, the good way? http://stackoverflow.com/questions/1118183/how-to-debug-in-django-the-good-way for all types of Python code. If you are already into pdb you'd also want to have a look at IPDB that uses ipython for debugging...
How can I profile a SQLAlchemy powered application? http://stackoverflow.com/questions/1171166/how-can-i-profile-a-sqlalchemy-powered-application example if you log something right after a SQL operation you'd see something like this in your log 17 37 48 325 INFO sqlalchemy.engine.base.Engine.0x...048c.. reveals that individual queries are taking too long you'd need a breakdown of how much time was spent within the database..
How do you use the ellipsis slicing syntax in Python? http://stackoverflow.com/questions/118370/how-do-you-use-the-ellipsis-slicing-syntax-in-python the documentation . Some examples here . In your own class you'd use it like this class TestEllipsis object ... def __getitem__..
python: list vs tuple, when to use each? http://stackoverflow.com/questions/1708510/python-list-vs-tuple-when-to-use-each tuples being for heterogenous collections similar to what you'd use struct s for in C and lists being for homogenous collections.. and lists being for homogenous collections similar to what you'd use arrays for. But I've never quite squared this with the mutability..
Is `import module` better coding style than `from module import function`? http://stackoverflow.com/questions/1744258/is-import-module-better-coding-style-than-from-module-import-function the import of just one of them to a different module then you'd break the normal connection between calls to seed and results..
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 if we use a less limited dtype we'll still get the result you'd expect In 5 y 255 np.ones 100 In 6 np.einsum 'i ' y Out 6 25500.0..
How do I fix PyDev “Undefined variable from import” errors? http://stackoverflow.com/questions/2112715/how-do-i-fix-pydev-undefined-variable-from-import-errors see not runtime info if you opened that module yourself you'd have no indication that main was expected . You can use ctrl..
when does Python allocate new memory for identical strings? http://stackoverflow.com/questions/2123925/when-does-python-allocate-new-memory-for-identical-strings it just doesn't seem to be a promising tradeoff and here you'd be paying runtime not compile time so the tradeoff is even less..
Using Django time/date widgets in custom form http://stackoverflow.com/questions/38601/using-django-time-date-widgets-in-custom-form at media admin you can change that for your setup. Ideally you'd use a context processor to pass this values to your template..
Open document with default application in Python http://stackoverflow.com/questions/434597/open-document-with-default-application-in-python repsectively. Now let's say we use subprocess. Canonically you'd use try retcode subprocess.call open filename shell True if..
Is there a matplotlib equivalent of MATLAB's datacursormode? http://stackoverflow.com/questions/4652439/is-there-a-matplotlib-equivalent-of-matlabs-datacursormode more documentation i.e. a tiny bit at least . Basically you'd use it similar to this plt.figure plt.subplot 2 1 1 line1 plt.plot..
Using strides for an efficient moving average filter http://stackoverflow.com/questions/4936620/using-strides-for-an-efficient-moving-average-filter improve this question For what it's worth here's how you'd do it using fancy striding tricks. I was going to post this..
Dynamically adding a form to a Django formset with Ajax http://stackoverflow.com/questions/501719/dynamically-adding-a-form-to-a-django-formset-with-ajax what the new form will be inserted after. More than likely you'd want it at the end of the rest of the forms. The type argument..
Python string formatting: % vs. .format http://stackoverflow.com/questions/5082452/python-string-formatting-vs-format throw a TypeError . To guarantee that it always prints you'd need to do hi there s name # supply the single argument as a..
How do I translate a ISO 8601 datetime string into a Python datetime object? http://stackoverflow.com/questions/969285/how-do-i-translate-a-iso-8601-datetime-string-into-a-python-datetime-object to get an ISO 8601 string like 2010 05 08T23 41 54.000Z you'd have a fun time parsing that with strptime especially if you..
Is there a map without result in python? http://stackoverflow.com/questions/1080026/is-there-a-map-without-result-in-python a filter and a function that doesn't return a True value. You'd get an empty return list since filter only adds the values which..
http://stackoverflow.com/questions/110803/dirty-fields-in-django DB so the admin could roll back to any previous version. You'd have to work with it a bit if you want the change to not take.. based on something like @Armin Ronacher's DiffingMixin. You'd store the diff dictionary maybe pickled in a table for the admin..
Whats the best way to duplicate data in a django template? http://stackoverflow.com/questions/1178743/whats-the-best-way-to-duplicate-data-in-a-django-template You also have base_object.html that extends this template. You'd like each page to have a unique title and a matching h1 I think..
How do you use the ellipsis slicing syntax in Python? http://stackoverflow.com/questions/118370/how-do-you-use-the-ellipsis-slicing-syntax-in-python subclass slicing ellipsis share improve this question You'd use it in your own class since no builtin class makes use of..
Python random lines from subfolders http://stackoverflow.com/questions/12128948/python-random-lines-from-subfolders . You do not need to hold all the lines in memory however. You'd have to do this in two phases index your files to count the..
Python: is using “..%(var)s..” % locals() a good practice? http://stackoverflow.com/questions/1550479/python-is-using-vars-locals-a-good-practice what local names the formatting is going to be using. You'd have to open and peruse the L10N database identify the format..
Loop “Forgets” to Remove Some Items http://stackoverflow.com/questions/17299581/loop-forgets-to-remove-some-items char textlist at the beginning of your original loop. You'd expect perhaps that this would print out your string vertically..
http://stackoverflow.com/questions/1819124/image-comparison-algorithm either of the others gives well under half that value. You'd have to experiment with other images to see how well this might..
the best shortest path algorithm http://stackoverflow.com/questions/1846836/the-best-shortest-path-algorithm path between a node and every other node in the graph. You'd run it once for every node. Weights must be non negative so..
python tracing a segmentation fault http://stackoverflow.com/questions/2663841/python-tracing-a-segmentation-fault test.py 8 Line 8 line test.py 9 Line 9 return test.py 9 You'd probably want to write the trace output to a file of course...
Encoding in python with lxml - complex solution http://stackoverflow.com/questions/2686709/encoding-in-python-with-lxml-complex-solution chardet module or UnicodeDammit to decode the actual data. You'd want to do something vaguely like import chardet from lxml import..
How do I use subprocess.Popen to connect multiple processes by pipes? http://stackoverflow.com/questions/295459/how-do-i-use-subprocess-popen-to-connect-multiple-processes-by-pipes python pipes subprocess share improve this question You'd be a little happier with the following. import subprocess awk_sort.. the shell. Let it connect two processes with a pipeline. You'd be a lot happier rewriting 'script.awk' into Python eliminating..
Maximal Length of List to Shuffle with Python random.shuffle? http://stackoverflow.com/questions/3062741/maximal-length-of-list-to-shuffle-with-python-random-shuffle of these will never be obtained by shuffling the list. You'd again conceptually generate all permutations of the list then..
Python string formatting: % vs. .format http://stackoverflow.com/questions/5082452/python-string-formatting-vs-format is also how it can either take a variable or a tuple. You'd think the following would always work hi there s name yet if..
How to dynamically load a Python class http://stackoverflow.com/questions/547829/how-to-dynamically-load-a-python-class like this won't work __import__ 'foo.bar.baz.qux' You'd have to call the above function like so my_import 'foo.bar.baz.qux'..
Python check for valid email address? http://stackoverflow.com/questions/8022530/python-check-for-valid-email-address and at least one . in the part after the @ ^@ @ ^@ . ^@ You'd probably also want to disallow whitespace there are probably..
How do I correctly clean up a Python object? http://stackoverflow.com/questions/865115/how-do-i-correctly-clean-up-a-python-object self type value traceback self.package_obj.cleanup You'd use this as follows with PackageResource as package_obj # use..
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