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Convert string to ASCII value python：http://stackoverflow.com/questions/8452961/convert-string-to-ascii-value-python
https://docs.python.org/2/library/string.html
http://www.pythoncentral.io/python-unicode-encode-decode-strings-python-2x/
http://code.activestate.com/recipes/65117-converting-between-ascii-numbers-and-characters/
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原文地址：http://my.oschina.net/u/855532/blog/374539
