[Python-ideas] fancy indexing
pyideas at rebertia.com
Wed Jul 21 02:24:41 CEST 2010
On Tue, Jul 20, 2010 at 4:43 PM, Bruce Leban <bruce at leapyear.org> wrote:
> x = a[[y]]
> would be approximately equivalent to
> x = [a[i] for i in y]
You realize that syntax /already/ has a valid meaning in Python, right?
Namely, using a single-element list as a subscript:
>>> class Foo(object):
... def __getitem__(self, index):
... print "Subscript:", index
>>> a = Foo()
>>> y = 42
>>> x = a[[y]]
>>> # hey, whaddya know!
Making this syntax do something else would lead to some surprising
inconsistencies to say the least; albeit I don't know how common it is
to use lists as subscripts.
More information about the Python-ideas