Clean up use of mutable defaults under lib/ramble/ramble #835
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Danger of mutable defaults:
https://pylint.pycqa.org/en/latest/user_guide/messages/warning/dangerous-default-value.html.
The cleanup list comes from:
There's also a flake8 plugin (bug-bear) that provides this check (along with other more opinionated checks.) Can be a follow-up to see if we should incorporate this into the CI checks.