判断一个数是否是4的n次方

def is_Power_of_four(n):
    while n and not (n & 0b11):
        n >>= 2
    return (n == 1)  

print(is_Power_of_four(4))
print(is_Power_of_four(12))
print(is_Power_of_four(16))
print(is_Power_of_four(255))

原文地址：https://www.cnblogs.com/sea-stream/p/10172470.html