As an addendum to the other answers, this sounds like a fine use-case for a context manager that will re-map the names of these functions to ones which return a list and introduce reduce in the global namespace.
A quick implementation might look like this:
from contextlib import contextmanager
@contextmanager
def noiters(*funcs):
if not funcs:
funcs = [map, filter, zip] # etc
from functools import reduce
globals()[reduce.__name__] = reduce
for func in funcs:
globals()[func.__name__] = lambda *ar, func = func, **kwar: list(func(*ar, **kwar))
try:
yield
finally:
del globals()[reduce.__name__]
for func in funcs: globals()[func.__name__] = func
With a usage that looks like this:
with noiters(map):
from operator import add
print(reduce(add, range(1, 20)))
print(map(int, ['1', '2']))
Which prints:
190
[1, 2]
Just my 2 cents :-)