The jsonschema module has 3 type: ignore comments that are not in PEP484 format. This results in the following error when running mypy where referencing has been imported:

$ mypy my_package
/usr/local/lib/python3.8/dist-packages/referencing/jsonschema.py:432: error: Invalid "type: ignore" comment
/usr/local/lib/python3.8/dist-packages/referencing/jsonschema.py:474: error: Invalid "type: ignore" comment
/usr/local/lib/python3.8/dist-packages/referencing/jsonschema.py:505: error: Invalid "type: ignore" comment
Found 3 errors in 1 file (errors prevented further checking)

The error produced is the same as reported here. However, newer versions of mypy do not fix the issue, as the style is not correct.

These can't be ignored with the mypy ignore_errors = True flag, because these are fatal errors that do not allow mypy to run over the rest of the codebase.

From what I can tell, the error messages just need an extra # after the error code to allow mypy to pass