Mis-cased error
FYI @clcheng - I don't know if you are already aware but I found this non-fatal bug while running limit_scan with the --exclude parameter incorrectly, as I was separating selections via a comma rather than a semicolon (I was incorrectly using --exclude chhh=3.7;ctthh=-0.9) - the script finds there are too many equal signs but the casing of the error type is incorrect:
So an error is raised but I don't believe the one you want to raise: NameError: name 'RuntimEerror' is not defined