Dictionary setdefault，setdefault,#The setdefa

Dictionary setdefault，setdefault,#The setdefa

#The setdefault method is somewhat similar to get, except that in addition to the get #functionality, setdefault sets the value corresponding to the given key if it is not #already in the dictionary:d = {}print d.setdefault('name', 'N/A')print  dd['name'] = 'Gumby'd.setdefault('name', 'N/A')print d#As you can see, when the key is missing, setdefault returns the default and updates #the dictionary accordingly. If the key is present, its value is returned and the #dictionary is left unchanged. The default is optional, as with get; if it is left #out, None is used:d = {}print d.setdefault('name')print d