from UserDict import UserDict

a = []
b = ()
d = {'c': ord('a'),
     'z': UserDict.__name__,
     'xxx': 'XXX' * len('XXX'),
     }
print d.values()
d = {}
u = UserDict()
print d.keys()
x = u['a'] = d['a'] = 12
print u.keys()
u['a'] = u['a'] + 12
print d.get('b', 'b')
if d:
    del d['a']
d['b'] = 13
u.update(d)
print u