Patches item #1660179, was opened at 2007-02-14 19:17
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Category: Library (Lib)
Group: Python 2.6
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Chris AtLee (catlee)
Assigned to: Nobody/Anonymous (nobody)
Summary: functools.compose to chain functions together
Initial Comment:
The motivation for this patch was to be able to chain together
operator.itemgetter objects so that I could sort a list of items that have the
form ((a,b), c) by the 'a' or 'b' part of the item.
Sorting by 'b' can be accomplished with:
l.sort(key=compose(itemgetter(1), itemgetter(0)))
compose(itemgetter(1), itemgetter(0)) is equivalent to
def c(v):
return itemgetter(1)(itemgetter(0)(v))
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