为什么这个执行结果是不正确的
sum = 0
x = 1
n = 1
while True:
sum = sum + x*2^(n -1)
n = n + 1
if n > 20:
break
print sum
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sum = 0
x = 1
n = 1
while True:
sum = sum + x*2^(n -1)
n = n + 1
if n > 20:
break
print sum
2018-11-16
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