openpyxl: add a few type annotations #9681
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Diff from mypy_primer, showing the effect of this PR on open source code: pandas (https://github.com/pandas-dev/pandas)
+ pandas/io/excel/_openpyxl.py:73: error: Argument 1 to "load_workbook" has incompatible type "IO[bytes]"; expected "Union[str, Path, BinaryIO]" [arg-type]
+ pandas/io/excel/_openpyxl.py:554: error: Argument 1 to "load_workbook" has incompatible type "Union[Union[str, PathLike[str]], ReadBuffer[bytes]]"; expected "Union[str, Path, BinaryIO]" [arg-type]
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I've just added a few of the type annotations I specifically needed, but will add some more at a later date.