some pep and code cleanup in shapes.py

3-manifolds / SnapPy

SnapPy is a package for studying the topology and geometry of 3-manifolds, with a focus on hyperbolic structures. It is based on the SnapPea kernel written by Jeff Weeks.

https://snappy.computop.org/

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some pep and code cleanup in shapes.py #77

Closed fchapoton closed 2 years ago

fchapoton commented 2 years ago

in particular, get rid of the comparison of types, but use "isinstance" instead