Names Types.py

>>> engineers = {'bob', 'sue', 'ann', 'vic'} >>> managers = {'tom', 'sue'} >>> 'bob' in engineers True >>> engineers & managers {'sue'} >>> engineers | managers {'bob', 'tom', 'sue', 'vic', 'ann'} >>> engineers - managers {'vic', 'ann', 'bob'} >>> managers - engineers {'tom'} >>> engineers > managers False # Is bob an engineer? # Who is both engineer and manager? # All people in either category # Engineers who are not managers # Managers who are not engineers # Are all managers engineers? (superset) >>> {'bob', 'sue'} < engineers True >>> (managers | engineers) > managers True >>> managers ^ engineers {'tom', 'vic', 'ann', 'bob'} # Are both engineers? (subset) # All people is a superset of managers # Who is in one but not both? >>> (managers | engineers) - (managers ^ engineers) # Intersection! {'sue'}