Python >= 3.5 alternative: [*l1, *l2] Another alternative has been introduced via the acceptance of PEP 448 which deserves mentioning. The PEP, titled Additional Unpacking Generalizations, generally …

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 is necessary to …

In Python 3, filter doesn't return a list, but a generator-like object. Finding the first occurrence If you only want the first thing that matches a condition (but you don't know what it is yet), it's fine to use a for …

4147 new_list = my_list doesn't actually create a second list. The assignment just copies the reference to the list, not the actual list, so both new_list and my_list refer to the same list after the assignment. …

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. ...

Jul 9, 2010 · How can I list all files of a directory in Python and add them to a list?

The idiom for such operations is to use the reduce function (global in Python 2.X, in module functools in Python 3.X) with an appropriate binary operator either taken from the operator module or coded …

Sep 17, 2012 · For handling a few strings in separate variables, see How do I append one string to another in Python?. For the opposite process - creating a list from a string - see How do I split a …

dir () is exactly what I was looking for when I Googled 'Python object list attributes' -- A way to inspect an instance of an unfamiliar object and find out what it's like.

Jun 14, 2019 · Downvoted because I feel the core of this answer is incorrect. Getting a list when you want an element only postpones the inevitable "list index out of range" - and that's what should …