How can I collect the results of a repeated calculation in a list, dictionary etc. (or make a copy of a list with each element modified)? (3 answers)

If your list of lists comes from a nested list comprehension, the problem can be solved more simply/directly by fixing the comprehension; please see How can I get a flat result from a list …

Jan 27, 2012 · Possible Duplicate: Good Primer for Python Slice Notation I've been reading over some sample code lately and I've read quite a few websites but I just can't seem to get the …

Python slicing is a computationally fast way to methodically access parts of your data. In my opinion, to be even an intermediate Python programmer, it's one aspect of the language that it …

Apr 22, 2013 · The second action taken was to revert the accepted answer to its state before it was partway modified to address "determine if all elements in one list are in a second list".

Apr 4, 2009 · Is the a short syntax for joining a list of lists into a single list ( or iterator) in python? For example I have a list as follows and I want to iterate over a,b and c.

Is there a way in Python to list all installed packages and their versions? I know I can go inside python/Lib/site-packages and see what files and directories exist, but I find this very awkward. ...

Your options are np.where, itertools.compress, and list comprehension. See the detailed comparison below, where it can be seen np.where outperforms both itertools.compress and …

I am more and more dissiapointed with python 'functional' capabilities. In haskell there is find function in Data.List module that doing exactly that. But in python it's not and it's to small to …

As @Georgy points out correctly in the answer below, any changes to the new_list values will also change the values in my_list. So actually the copy.deepcopy () method is the only real copy …