Ned Deily added the comment:
I believe this is a duplicate of Issue36468 which identifies the issue which is
apparently fixed in Tk 8.6.9+; it also provides a workaround for Tk 8.6.8.
--
nosy: +ned.deily
resolution: -> duplicate
stage: -> resolved
status: open -> closed
superseder:
New submission from Acid Ascorbic :
It is impossible to set colors properly in Treeview.
Python behavior is different between versions 3.6.2 and 3.7.3/3.8.0.
Origin:
https://stackoverflow.com/questions/57634982/can-i-change-the-foreground-color-of-a-single-column-in-python-treeview/59047842
