New submission from Esa Peuha:
Here are some additions to documentation of a few functions:
all, any: alternative definitions using functools.reduce
enumerate: alternative definition using zip and itertools.count
sum: equivalent definition using functools.reduce and operator.add
Georg Brandl added the comment:
Most of these changes should not be applied: the alternate equivalents in
terms of reduce() will not help understanding, Equivalents for reduce() may be
useful, but I would limit them to one per case, possibly even just one function
that covers both cases.
Esa Peuha added the comment:
How would you give a single definition of reduce() that helps people to
understand both 2-arg and 3-arg variants? The way it is implemented in C is
impossible to duplicate in pure Python; the best you could do is a hack that
works unless someone *tries* to break
Georg Brandl added the comment:
What about
def reduce(function, iterable, initializer=None):
it = iter(iterable)
if initializer is None:
value = next(it)
else:
value = initializer
for element in it:
value = function(value, element)
return value
