PS C:\your\path\here > python >>> import matplotlib 5. Launch IDLE. Now, you can launch IDLE, so that it runs Python and has access to the matplotlib module in your virtual environment. python -m ...

I haven't yet figured out if this is an issue with Sphinx or Matplotlib, but when building some documentation in Python 3 that requires the plot_directive, I get: Running Sphinx v1.1.3 Extension error ...

You can verify this by running Python, and attempting to import matplotlib from within the Python shell. (demo) $ python >>> import matplotlib >>> 6. Launch IDLE. Now, you can launch IDLE, so that it ...