Looks good to me.
One minor nit (can be fixed while landing):
In get_branches(), there is some indentation that is only 3 spaces (should be four), and there should be a space after "None:".
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Looks good to me.
One minor nit (can be fixed while landing):
In get_branches(), there is some indentation that is only 3 spaces (should be four), and there should be a space after "None:".