TypeError: unsupported operand type(s) for +: 'NoneType' and 'float' on 1.2.1

Community matplotlib-users
1

Hi,

I experienced similar error under python 2.7.5 win32 after
dirty-upgrading from mpl 1.2.1 to 1.3.1 (w/o first removing the old
version). A clean install solved the problem.

Cheers,
Gregorio