[Python-bugs-list] [ python-Feature Requests-453506 ] lists should have a copy method

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Feature Requests item #453506, was opened at 2001-08-20 23:23
Message generated for change (Comment added) made by jhmagnus
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Category: Python Interpreter Core
Group: None
Status: Closed
Resolution: Rejected
Priority: 1
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Guido van Rossum (gvanrossum)
Summary: lists should have a copy method

Initial Comment:
This is per someone on comp.os.python.
It's odd that dictionaries have a copy
method (you can say dict.copy()) but to
copy a list you have to say list[:] or use
copy.copy.  I think list.copy() should be added
for consistency.


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Comment By: Jesper Hertel (jhmagnus)
Date: 2003-05-13 16:01

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What does schmuitive mean?

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Comment By: Guido van Rossum (gvanrossum)
Date: 2003-05-13 15:34

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Intuitive, schmuitive. :-)

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Comment By: Tim Peters (tim_one)
Date: 2003-05-13 03:57

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Assigned to Guido for rejection <wink>.

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Comment By: Brett Cannon (bcannon)
Date: 2003-05-13 03:46

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I'm with Tim; you don't need seven ways to copy (Tim forgot using a list 
comprehension and ``map(None, list)``  =).

I say this RFE gets rejected.

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Comment By: Jesper Hertel (jhmagnus)
Date: 2003-01-21 15:30

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I agree that it would be nice (and consistent) if lists had 
a copy() method. It would be more convenient. It is always 
tiresome to have to import modules to do simple stuff like 
this.

The list[:] is a trick that you have to know before you can 
use it (it doesn't seem obvious to me), but list.copy() 
seems intuitive to me.

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Comment By: Tim Peters (tim_one)
Date: 2002-04-23 07:43

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I doubt Guido would go for it.  dicts grew a .copy() method 
*because* there was no convenient syntax like list[:] that 
worked for dicts.  That's not a reason to add a .copy() 
method to lists too.  Note that if you're too fond of 
uniformity <wink>, don't use any of these:  use copy.copy() 
or copy.deepcopy().  Python doesn't need four ways to 
spell "copy this list".  Oops:  make that five.  list
(somelist) also copies a list.  In 2.2, dict(somedict) also 
copies a dict.  Enough already.

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Comment By: Michael Gilfix (mgilfix)
Date: 2002-04-23 05:53

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What's the status of this? It seems pretty useful. I could
submit a patch if someone likes...

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