New submission from John Bachman :
Tested on Python3.6 on Ubuntu 18.04
The following code snippet produces the wrong results.
Snippet:
M = [[[0] * 2] * 2] * 2
M[0][0][0] = 1
print(M[0][0][0]) # Should be one
print(M[1][0][0]) # Should still be zero
My output:
1
1
For some reason when you assign to any list inside the 3D matrix, all lists in
the array are changed, 2D Matrix works but 3D modifies every 2D matrix.
--
components: Interpreter Core
messages: 338963
nosy: John Bachman
priority: normal
severity: normal
status: open
title: 3D Array Assignment to all 2D sub-arrays
type: behavior
versions: Python 3.6
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<https://bugs.python.org/issue36450>
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