[Patches] [ python-Patches-661092 ] list.sort cmpfunc default

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Patches item #661092, was opened at 2003-01-02 08:28
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Category: Core (C code)
Group: Python 2.3
Status: Open
Resolution: None
Priority: 5
Submitted By: Skip Montanaro (montanaro)
Assigned to: Tim Peters (tim_one)
Summary: list.sort cmpfunc default

Initial Comment:
It surprised me today when I saw a functional sort written like this:

def sort(sequence, cmpfunc=None):
    sorted = list(sequence)
    if cmpfunc is None:
        sorted.sort()
    else:
        sorted.sort(cmpfunc)
    return sorted

If [].sort() was written in Python its function signature would be declared as above (obviously the body would be different), and the above functional sort could be written as:

def sort(sequence, cmpfunc=None):
    sorted = list(sequence)
    sorted.sort(cmpfunc)
    return sorted

The attached patch supports calling [].sort() with an explicit argument of None.  (No doc change yet. If you approve, I will make that mod.)


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