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#!usr/bin/env python
# encoding:utf-8
import collections
def strReverse(strDemo):
deque1=collections.deque(strDemo)
deque2=collections.deque()
for tmpChar in deque1:
deque2.extendleft(tmpChar)
return ''.join(deque2)
print(strReverse('qbitschool.cn'))
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