str.encode
把字符串编码成字节序列
bytes.decode
把字节序列解码成字符串
https://docs.python.org/3.5/library/stdtypes.html
str.encode(encoding=”utf-8”, errors=”strict”)Return an encoded version of the string as a bytes object. Default encoding is ‘utf-8‘. errors may be given to set a different error handling scheme. The default for errors is ‘strict‘, meaning that encoding errors raise a UnicodeError. Other possible values are ‘ignore‘, ‘replace‘, ‘xmlcharrefreplace‘, ‘backslashreplace‘ and any other name registered via codecs.register_error(), see section Error Handlers. For a list of possible encodings, see section Standard Encodings.
Changed in version 3.1: Support for keyword arguments added.
bytes.decode(encoding=”utf-8”, errors=”strict”)bytearray.decode(encoding=”utf-8”, errors=”strict”)Return a string decoded from the given bytes. Default encoding is ‘utf-8‘. errors may be given to set a different error handling scheme. The default for errors is ‘strict‘, meaning that encoding errors raise a UnicodeError. Other possible values are ‘ignore‘, ‘replace‘ and any other name registered via codecs.register_error(), see section Error Handlers. For a list of possible encodings, see section Standard Encodings.
Note
Passing the encoding argument to str allows decoding any bytes-like object directly, without needing to make a temporary bytes or bytearray object.
Changed in version 3.1: Added support for keyword arguments.
python3 str.encode bytes.decode
原文：http://www.cnblogs.com/antflow/p/7452208.html