Source Code for Module parser_course.small_parsers.multivalued_dictionary

 1  try: 
 2      import collections 
 3      defaultdict = collections.defaultdict 
 4  except AttributeError: 
 5      print '*Warning*: Using local class definition of defaultdict' 
 6      print '           collections.defaultdict not available until Python 2.5' 
 7 -    class defaultdict(dict): 
 8          """Subclass of dict which sets key to a default value 
 9             when key is unknown.  defaultvalue supplied by callable 
10             default_factory supplied when dict instance is created. 
11             default_factory must be callable with no args.""" 
12 -        def __init__(self,default_factory, *a, **k): 
13              dict.__init__(self, *a, **k) 
14              self.default_factory = default_factory 
15   
16 -        def __getitem__ (self, key): 
17              if key not in self and self.default_factory is not None: 
18                  self[key] = self.default_factory() 
19              return dict.__getitem__(self,key) 
20   
21 -class multivaluedDictionary(defaultdict): 
22   
23 -    def __init__(self, *a, **k): 
24          defaultdict.__init__(self,list,*a,**k) 
25