第17讲 动动手 自己写的答案
>>> def power(x,y):return x**y
>>> power(3,4)
81
>>> def gcd(a,b):
while b !=0:
a,b = b, a%b
return a
>>> gcd(252,105)
21
>>> def definebin(num):
l = []
s = ''
while num:
m = num % 2
num = num // 2
l.append(m)
while l:
s += str(l.pop())
return s
>>> definebin(4)
'100'
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