这样为什么不对呀？
>>> sum = 0
>>> x = 0
>>> while True:
... sum = sum + 2^x
... x = x + 1
... if x > 19:
... break
...
>>> print(sum)
4
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>>> sum = 0
>>> x = 0
>>> while True:
... sum = sum + 2^x
... x = x + 1
... if x > 19:
... break
...
>>> print(sum)
4
2016-05-23
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