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)

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 …

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 …

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".

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 …

How to apply a logical operator to all elements in a python list Asked 15 years, 11 months ago Modified 9 years, 9 months ago Viewed 141k times

Nov 1, 2011 · In fact, despite the title "Python removing duplicates in lists", it doesn't seem like OP wanted to remove duplicates from within the same list at all. Rather, it looks like OP wanted 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 …

Feb 2, 2014 · Python’s lists are variable-length arrays, not Lisp-style linked lists. The implementation uses a contiguous array of references to other objects, and keeps a pointer to …