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bpo-41774: Add programming FAQ entry (GH-22402)

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In the "Sequences (Tuples/Lists)" section, add
"How do you remove multiple items from a list".
(cherry picked from commit 5b0181d1f6)

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>
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Miss Islington (bot) 2020-09-28 22:27:06 -07:00 • committed by GitHub
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Doc/faq/programming.rst
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@ -1164,6 +1164,21 @@ This converts the list into a set, thereby removing duplicates, and then back
into a list.
How do you remove multiple items from a list
--------------------------------------------
As with removing duplicates, explicitly iterating in reverse with a
delete condition is one possibility. However, it is easier and faster
to use slice replacement with an implicit or explicit forward iteration.
Here are three variations.::
mylist[:] = filter(keep_function, mylist)
mylist[:] = (x for x in mylist if keep_condition)
mylist[:] = [x for x in mylist if keep_condition]
If space is not an issue, the list comprehension may be fastest.
How do you make an array in Python?
-----------------------------------

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Misc/NEWS.d/next/Documentation/2020-09-24-15-35-13.bpo-41774.5IqdGP.rst Normal file
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@ -0,0 +1,2 @@
In Programming FAQ "Sequences (Tuples/Lists)" section, add "How do you
remove multiple items from a list".