Avoid initing MPI in Python interpreter.
When`paraview` is imported in a standard Python interpreter (not via pvpython), we ended up initializing MPI due to !1987. That caused failures generating sphinx documentation with Python 3. In any cause, it sounds like a risky move to init MPI in a standard Python interpreter unless user explicitly asked for. They do can that by doing the following: import paraview paraview.options.batch = True
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