From the docs:
all(iterable)
Return True if all elements of the iterable are true. Equivalent
to:
def all(iterable):
for element in iterable:
if not element:
return False
return True
Then I'd say the comment is misleading. An empty list has no
item that is true (or false), yet it returns true. The comment
in the docs should read "Return False if any element of the
iterable is not true" or "Return True if all elements of the
iterable are true or if the iterable is empty."
To get the behavior the original comment describes, would seem to
require an implementation something like this:
def all(iterable):
iterable = iter(iterable)
try:
element = iterable.next()
except StopIteration:
raise UnderdefinedBecauseNoElementsToCompareToTrue
while element:
try:
element = iterable.next()
except StopIteration:
return True
return False
Tweaking the documentation seems like an easier and more
backwards compatible solution to me :)
-tkc
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