Using python context managers and missing values?

How can I use a python package's context managers from within pycall?

Also how does Pycall handle missing data? For example, If I'm using a python function that manipulates a masked numpy array or pandas df with missing values.

Begin by locating PyCall's documentation and examples for Python context managers, masked NumPy arrays, and pandas data frames. Clarify the supported behavior and add focused usage guidance for each case; done means the documentation answers both questions.

Written by the indexing model from the issue text.