PR #267 gets the CI working again, and (all but one of) the tests passing. But only on Pythons 2.7, 3.5, ..., 3.9. Testing on Python 3.10 causes an ImportErrro ...

The Python Shapefile Library (PyShp) provides read and write support for the Esri Shapefile format. The Shapefile format is a popular Geographic Information System vector data format created by Esri.