[issue43013] IDLE: update code, mostly by cleanups of 2.x or 2to3 artifacts

[Terry J. Reedy]

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

5. Extraneous () after class name in class header: 'class name():'.  Never done in idlelib itself, 27 in test files, mostly in 1 file.

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<https://bugs.python.org/issue43013>
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