General Iterables

len(iterable)

Loop Over Two Iteratables

for (f,b) in zip(foo, bar):
    print "f: ", f ,"; b: ", b

Stops at the shorter of the two and works for an arbitrary number of iterables

Functional

In python3, map makes an generator object. Wrap with list() to make a list again

Map

outputs = map(function_to_apply, inputs)

Filter

number_list = range(-5, 5)
less_than_zero = list(filter(lambda x: x < 0, number_list))

Reduce

from functools import reduce
product = reduce((lambda x, y: x * y), [1, 2, 3, 4])