pycodestyle in 5 files of src/sage/graphs/generators #34021
Description
We fix pycodestyle issues in files basic.py, chessboard.py, degree_sequence.py, intersection.py and `platonic_solids.py.
Component: graph theory
Author: David Coudert
Branch/Commit: a219d86
Reviewer: Frédéric Chapoton
Issue created by migration from https://trac.sagemath.org/ticket/34021