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#!/usr/bin/env python3
import math
def is_power_three(number):
''' Given a positive integer. Returns true if the given integer is a power
of three otherwise returns false.
>>> is_power_three(27)
True
>>> is_power_three(0)
True
>>> is_power_three(6)
False
'''
cr = round(math.pow(number, 1/3), 6)
return ((cr - int(cr)) == 0)
if __name__ == "__main__":
import doctest
doctest.testmod()
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