cookie操作:限制4kb,300个，每个域名20个
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cgi.escape
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urllib.parse.quote_plus unquote_plus
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open().read() HTMLParser().unescape()
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cgi.FieldStorage() xx.keys()
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os.path.abspath(path1) 绝对路径 os.path.abspath(".") isinstance
PyMailCGI:https://github.com/huangantai/PyMailCGI.git
