init_notebook_mode() can't be called in PYTHONSTARTUP

[glehmann]

Python notebooks supports loading some code from a file pointed by the PYTHONSTARTUP environment variable. I used it run init_notebook_mode() with plot.ly 1.9.13, but it now seems broken with the last plot.ly version: the graph zone is just empty.

[jonmmease]

PYTHONSTARTUP is a Python, not Jupyter notebook, startup configuration, so I'm not surprised that init_notebook_mode() might not be reliable in that context.

I'm going to close this for now, but the automatic initialization of offline mode is something that we could handle through the plotly.io.show concept described in #1098.