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The style in ubiquity is to check specifically for OSError, rather than for the more general EnvironmentError. Doing so is safe in this case; you aren't going to get anything else from os.mkdir.
I don't think you need to recheck os.path.isdir; simply having got EEXIST from os.mkdir implies that. I would just write this as 'if e.errno != errno.EEXIST'.