positive.py

def positive(a_list):

answer = []

for a in a_list:
    if a > 0:
        answer.append(a)

return answer

print positive([1, -2, 0, 5, -5, 3, 3, 6])

values = [45, -67, 90, -56] print positive(values)

all_negative = [-45, -67, -90, -56] print positive(all_negative)