把If条件置于语句最后和前面有什么区别吗？
sum = 0
x = 1
n = 1
while True:
sum = sum +x
x= x*2
n = n+1
if n >20:
break
print sum
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sum = 0
x = 1
n = 1
while True:
sum = sum +x
x= x*2
n = n+1
if n >20:
break
print sum
2018-07-13
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