5分钟
循环使用 else 语句
在 python 中，while … else 在循环条件为 false 时执行 else 语句块：
实例
#!/usr/bin/python
count = 0
while count < 5:
print count, " is less than 5"
count = count + 1
else:
print count, " is not less than 5"以上实例输出结果为：
0 is less than 5
1 is less than 5
2 is less than 5
3 is less than 5
4 is less than 5
5 is not less than 5
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