% cp person1.py person.py
% python session1.py
<Person instance at e0bb0>
('bob', 'psychologist', 70000, 17500.0)
(35, 40) 10000.0
('howard', '', 0, 0.0)

% python session2.py
['emily', 'bob', 'jerry']
<Person instance at e08d0>
howard ('howard', '', 0, 0.0)
peeper ('peeper', '', 0, 0.0)
('bob', 'psychologist', 70000, 17500.0)
('emily', 'teacher', 40000, 10000.0)
emily 10000.0
bob 17500.0
jerry 12500.0

cp person2.py person.py
% python session3.py
['emily', 'bob', 'jerry']
Person=>bob
Person=>howard (('howard', '', 0, 0.0), [])
Person=>peeper (('peeper', '', 0, 0.0), [])
(('bob', 'psychologist', 70000, 21000.0), [('friends', [Person=>howard, 
Person=>peeper])])
(('emily', 'teacher', 40000, 12000.0), [('age', (35, 40))])
Person=>emily 12000.0
Person=>bob 21000.0
Person=>jerry 15000.0