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Python 2.7.10 (default, May 23 2015, 09:40:32) [MSC v.1500 32 bit (Intel)] on win32 Type "copyright", "credits" or "license()" for more information. >>> ================================ RESTART ================================ >>> >>> s=‘xiaodeng‘ >>> s[-1] ‘g‘ >>> s[len(s)-1] ‘g‘ >>> s[-2] ‘n‘ >>> s[len(s)-2] ‘n‘ >>>
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原文地址：http://www.cnblogs.com/dengyg200891/p/4894257.html
