题目：Write a program to check whether a given number is an ugly number.
Ugly numbers are positive numbers whose prime factors only include 2, 3, 5. For example, 6, 8 are ugly while 14 is not ugly since it includes another prime factor 7.
Note that 1 is typically treated as an ugly number.
代码：
def isUgly(self, num):
"""
:type num: int
:rtype: bool
"""
if num==None or num==0:
return False
while num%2 == 0:
num /= 2
while num%3 ==0:
num /= 3
while num%5 ==0:
num /= 5
if num == 1:
return True
else:
return False
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