>>> "hello".encode("hex")
'68656c6c6f'
相应的还可以
>>> '68656c6c6f'.decode("hex")
'hello'
查了一下手册，还有这些codec可用
Codec | Aliases | Operand type | Purpose |
| base64_codec | base64, base-64 | byte string | Convert operand to MIME base64 |
| bz2_codec | bz2 | byte string | Compress the operand using bz2 |
| hex_codec | hex | byte string | Convert operand to hexadecimal representation, with two digits per byte |
| idna | Unicode string | Implements RFC 3490. New in version 2.3. See also encodings.idna | |
| mbcs | dbcs | Unicode string | Windows only: Encode operand according to the ANSI codepage (CP_ACP) |
| palmos | Unicode string | Encoding of PalmOS 3.5 | |
| punycode | Unicode string | Implements RFC 3492. New in version 2.3. | |
| quopri_codec | quopri, quoted-printable, quotedprintable | byte string | Convert operand to MIME quoted printable |
| raw_unicode_escape | Unicode string | Produce a string that is suitable as raw Unicode literal in python source code | |
| rot_13 | rot13 | Unicode string | Returns the Caesar-cypher encryption of the operand |
| string_escape | byte string | Produce a string that is suitable as string literal in python source code | |
| undefined | any | Raise an exception for all conversions. Can be used as the system encoding if no automatic coercion between byte and Unicode strings is desired. |
