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string.ascii_lowercase=‘abcdefghijklmnopqrstuvwxyz‘
string.ascii_uppercase=‘ABCDEFGHIJKLMNOPQRSTUVWXYZ‘
string.ascii_letters=‘abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ‘
string.digits=‘0123456789‘
string.hexdigits=‘0123456789abcdefABCDEF‘
string.octdigits=‘01234567‘
string.punctuation标点符号 !"#$%&‘()*+,-./:;<=>?@[\]^_`{|}~
string.whitespace空白符 space,tab,换行等
string.printable可打印字符,以上所有集合
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原文地址:http://www.cnblogs.com/fj0716/p/5221729.html