Gareth Rees <g...@garethrees.org> added the comment:
The behaviour of the * operator (and the associated gotcha) is documented under
"Common sequence operations" [1]:
Note that items in the sequence s are not copied; they are referenced
multiple times. This often haunts new Python programmers ...
There is also an entry in the FAQ [2]:
replicating a list with * doesn’t create copies, it only creates
references to the existing objects
[1]
https://docs.python.org/3/library/stdtypes.html#sequence-types-list-tuple-range
[2] https://docs.python.org/3/faq/programming.html#faq-multidimensional-list
----------
nosy: +g...@garethrees.org
resolution: -> not a bug
stage: -> resolved
status: open -> closed
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue32194>
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