This allows users to call remove_item in a loop. Likewise, it prevents
the footgun of doing children.append(...) which does not uphold the
invariants with the weight system.
Segments where readability was hampered were fixed by appropriate
format skipping directives. New code should hopefully be black
compatible. The moment they remove the -S option is probably the moment
I stop using black though.
Rapptz
Kellen
Narmy
Stocker
Sebastian Law
Pawnyy
Josh