Dictionaries are indexed by keys, which can be any immutable type
# Dictionaries are indexed by keys, which can be any immutable type; # strings and numbers can always be keys.
# Tuples can be used as keys if they contain only strings, numbers, or tuples; # if a tuple contains any mutable object either directly or indirectly, # it cannot be used as a key.
# You can't use lists as keys, since lists can be modified.
# a dictionary is an unordered set of key: value pairs, with the requirement that the # keys are unique (within one dictionary).
tel = {'jack': 4098, 'sape': 4139} tel['guido'] = 4127 print tel
print tel['jack']
del tel['sape'] tel['irv'] = 4127 print tel
tel.keys()
print tel.has_key('guido')
print 'guido' in tel
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