Simple del[] list question

Matthew Hirsch meh9 at cornell.edu
Wed Apr 26 19:25:16 CEST 2000


Hi All,

What is going on here?

This leaves a intact.

>>> a=[[1,2,3],[4,5,6]]
>>> b=a[:]
>>> del b[0]
>>> b
[[4, 5, 6]]
>>> a
[[1, 2, 3], [4, 5, 6]]


This also changes a.

>>> a=[[1,2,3],[4,5,6]]
>>> b=a[:]
>>> del b[0][0]
>>> b
[[2, 3], [4, 5, 6]]
>>> a
[[2, 3], [4, 5, 6]]

Why did a change?  Why suddenly when you go to two dimensions does the 
behavior change?

Thanks,
Matt



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