python 判断一个数字是否为3的幂

def is_Power_of_three(n):  
    while (n % 3 == 0):  
         n /= 3;           
    return n == 1;  
  
print(is_Power_of_three(9))  
print(is_Power_of_three(81))  
print(is_Power_of_three(21))
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原文地址：https://www.cnblogs.com/sea-stream/p/9962034.html