How to install python application with tkcalendar module by pyinstaller?

The issue does not come from tkcalendar but from the fact that PyInstaller does not detect second level imports. A way to solve this issue is explained in tkcalendar’s documentation in the HowTos section:

When bundling an application with PyInstaller, there is an
issue with the
detection of the babel dependency of tkcalendar. This can be fixed by
using the --hidden-import option:

$ pyinstaller --hidden-import babel.numbers myscript.py

or by editing the .spec file:

hiddenimports=["babel.numbers"]

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