flake8 cleanup for interval_exchanges/constructors

flatsurf / surface-dynamics

Teichmüller dynamics in SageMath

https://flatsurf.github.io/surface-dynamics/

GNU General Public License v2.0

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Closed fchapoton closed 3 years ago

fchapoton commented 3 years ago

adding some missing imports, removing useless ones

also some code formatting for full flake8 standard