New issue 897: my_plugins.py no longer appears to be supported in yt 3.0 https://bitbucket.org/yt_analysis/yt/issue/897/my_pluginspy-no-longer-appear... Anonymous: Specifically, add_field is "not defined" when yt tries to grab my_plugins.py This example for a my_plugins.py file fails: http://paste.yt-project.org/show/5115/