第28个python程序：布尔表达式练习

[root@mysql1 pshell]# python Python 2.6.6 (r266:84292, Jan 22 2014, 01:49:05)  [GCC 4.4.7 20120313 (Red Hat 4.4.7-4)] on linux2 Type "help", "copyright", "credits" or "license" for more information. >

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