Frequently Asked Questions

Why do I get ModuleNotFoundError: No module named 'polars' when using PyMongoArrow?

This error is raised when an application attempts to use a PyMongoArrow API that returns query result sets as a polars.DataFrame instance without having polars installed in the Python environment. Since polars is not a direct dependency of PyMongoArrow, it is not automatically installed when you install pymongoarrow and must be installed separately:

$ python -m pip install polars