Dictionaries are indexed by keys, which can be any immutable type，indexedimmutable,# Dictionari

Dictionaries are indexed by keys, which can be any immutable type，indexedimmutable,# Dictionari

# 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'] = 4127print telprint tel['jack']del tel['sape']tel['irv'] = 4127print teltel.keys()print tel.has_key('guido')print 'guido' in tel