Can you revert all of the deleted newlines in networkx/generators/line.py? Not sure what happened there but we definitely don't want to get rid of those.

Now the newlines are gone but there are extra whitespaces at the start of the lines. If possible, it'd be better to revert the commit where the newlines were added instead of manually adding them back to avoid other formatting issues like this.

Also check out the developer guide, particularly the section on setting up a development environment and running e.g. black, which should prevent issues like this.