MPLCONFIGDIR tries to be created in read-only home#832

Merged

efiring merged 2 commits intomatplotlib:masterfrom

mdboom:read-only-directory

Aug 25, 2012

Commits on Aug 23, 2012

Create a config dir in `tempfile.gettempdir()` if the default location(s) are not writable.
mdboom
committed
Update docstring to reflect reality.
mdboom
committed