Initialization fails if get_home() returns None

[sellonen]

os.path.join(get_home(), 'SOMESTRING') 

is called a number of times in the init().py of matplotlib. The function join cannot handle None-type objects, yet the function get_home() sometimes returns None.

I ran into this issue while building a web application, and I had to resort to tweaking the default return value of the get_home() function.

[mdboom]

What version of matplotlib are you using? I don't believe this is the case any longer.

[sellonen]

Thanks for your quick reply! Here is the line returning None

https://github.com/matplotlib/matplotlib/blob/master/lib/matplotlib/__init__.py#L503

And here a join is attempted

https://github.com/matplotlib/matplotlib/blob/master/lib/matplotlib/__init__.py#L540

I know it's a bit peculiar installation, as none of the environment variables HOME, USERPROFILE, or TMP was defined, but it resulted directly from installing nginx from Ubuntu packages and uwsgi and matplotlib by pip, so I think I will run into this in the future as well.

[sellonen]

Woah sorry there is a check there before the second line, whereas in my code there was not.

[sellonen]

My version was 1.3.1.

[mdboom]

Sorry, my fault for not remembering that that fix hadn't made it into a release yet. This is already fixed on the maintenance branch, however, so it will make it into the next bugfix release. You may want to run the v1.3.x branch from git if this is an issue for you -- it is not terribly different from 1.3.1 and only contains bugfixes since then.

I'm closing this as already fixed. Thanks for the report.