full cleanup of tangle.py, plus some other py3 stuff

3-manifolds / Spherogram

Spherogram is a Python module for dealing with the kind of planar diagrams that arise in 3-dimensional topology, such as link and Heegaard diagrams. It a component of the larger SnapPy project.

https://snappy.math.uic.edu/spherogram.html

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full cleanup of tangle.py, plus some other py3 stuff #14

Closed fchapoton closed 3 years ago

fchapoton commented 3 years ago

mainly making a full pep8 cleanup of tangles.py

also removing some python3-conditional code in two other files