Library function to encode data to multipart/form-data format?

[Laura Creighton]

In a message of Mon, 21 Dec 2015 17:51:00 +0000, Grant Edwards writes:
>Is there a standard library function that can be used to encode data
>into multipart/form-data format?  IIRC, I looked for this once before
>and didn't find anything in the library. 
>
>[I don't want to actually send an HTTP POST or an email message, I
>just need to generate sets of data for test purposes.]
>
>-- 
>Grant Edwards               grant.b.edwards        Yow! -- I love KATRINKA
>                                  at               because she drives a
>                              gmail.com            PONTIAC.  We're going
>                                                   away now.  I fed the cat.
>-- 
>https://mail.python.org/mailman/listinfo/python-list

Cannibalise this:
http://code.activestate.com/recipes/146306/
which just uses standard library things.

Laura