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First solution in Clear category for Numbers Factory by juanjo.neri
def decomp(num):
rem = num
decomp = []
for factor in reversed(range(2, 10)):
while rem % factor == 0:
decomp.append(factor)
rem /= factor
return decomp if rem == 1 else [0]
def checkio(number):
return int(''.join(map(str, reversed(decomp(number)))))
if __name__ == '__main__':
#These "asserts" using only for self-checking and not necessary for auto-testing
assert checkio(20) == 45, "1st example"
assert checkio(21) == 37, "2nd example"
assert checkio(17) == 0, "3rd example"
assert checkio(33) == 0, "4th example"
assert checkio(3125) == 55555, "5th example"
assert checkio(9973) == 0, "6th example"
Nov. 7, 2017