Flake8 Line Continuation Plugin
The preferred way of wrapping long lines is by using Python’s implied line continuation inside parentheses, brackets and braces. Long lines can be broken over multiple lines by wrapping expressions in parentheses. These should be used in preference to using a backslash for line continuation.
pip install flake8-continuation
This package adds a single new warning, C092: prefer implied line continuation inside parentheses, brackets, and braces as opposed to a backslash. That error code was picked because ord('\\') == 92.