def amicable_pair(num):
"""
Determines if num is amicable and returns its copair element if it is
:param num:
:return: 0 if num is not amicable, num's copair element if it is
"""
copair = sum(factor.divisors(num)) - num
return copair if (sum(factor.divisors(copair)) - copair) == num and copair != num else 0
def abundant_numbers(limit):
"""
Find all abundant numbers less than a given limit
:param limit: Cutoff for list
:return: (list) Abundant numbers from 1 to limit
"""
return [x for x in xrange(1, limit) if sum(divisors(x)) > 2 * x]
