On 2021-05-27 13:15, Chris Angelico wrote:
Hmmmmmmmm.... let's see.
def merge_shortest(things):
... len=len
... ...
...
merge_shortest([])
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<stdin>", line 2, in merge_shortest
UnboundLocalError: local variable 'len' referenced before assignment
Okay, yeah, mea culpa. As several people pointed out that doesn't
work. But `len_ = len` does work. However, that doesn't change the
calculus at all for me. My point wasn't about using the exact same
variable name. It's that ANY ability to create a local variable that is
a fast-lookup shortcut for a global one is enough. My point is that
manually creating fast-lookup local-variable shortcuts is inherently a
performance hack and there's no real use in making it slightly
nicer-looking.
--
Brendan Barnwell
"Do not follow where the path may lead. Go, instead, where there is no
path, and leave a trail."
--author unknown
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