[Tutor] Duplicating lists in variables?
Ivan Van Laningham
ivanlan@callware.com
Fri, 17 Sep 1999 13:16:04 -0600
Hi All--
Warren 'The Howdy Man' Ockrassa wrote:
>
> I don't see an immediate way around this one.
>
> >>> foo = [1,2,3]
> >>> bar = foo
> >>> bar
> [1, 2, 3]
> >>> bar.append(4)
> >>> bar
> [1, 2, 3, 4]
> >>> foo
> [1, 2, 3, 4]
>
> When I append bar, IOW, foo gets modified too. Is there a way for me to
> actually *duplicate* a list or am I stuck just propagating pointers to
> one list?
>
Try this:
foo = [1,2,3]
bar = foo[:]
print foo
print bar
bar.append(4)
print foo
print bar
<life-is-easier-than-you-think>-ly y'rs,
Ivan
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Ivan Van Laningham
Callware Technologies, Inc.
ivanlan@callware.com
ivanlan@home.com
http://www.pauahtun.org
See also:
http://www.foretec.com/python/workshops/1998-11/proceedings.html
Army Signal Corps: Cu Chi, Class of '70
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