[issue45059] Typo: using "==" instead of "="

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

Definitely a typo.  Will apply fix and backport.

The first import of macosx initializes _tk_type to None.  The line in question intends to re-initialize it so that the subsequent assert can only pass if _init_tk_type changes it to something required.

Many other tests also set _tk_type as needed.  _tk_type should be restored in tearDownModule.  I will add that in a separate PR.  (The class cleanup already restores platform.)

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