Fix the import of Tkinter in Python 3+ #2157
Merged
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While following the example at https://open-babel.readthedocs.io/en/latest/UseTheLibrary/PythonInstall.html#test-the-installation, noticed that the
mol.draw()
step fails on importing ofTkinter
in Python 3.7. The module was renamed totkinter
in Python 3+ versions, and thesix
library supports the proper handling of the change: https://six.readthedocs.io/#module-six.moves (thanks to @tacaswell for the reference). I addedsix
as the install requirement.