python - Which is the appropriate way to test for a dictionary type? -


Why there are so many different ways to test for a dictionary? And if an object is a dictionary, what would be the most modern way to test it? [10]: isinstance (adict, types.DictType) out [10]: Really [11]: isinstance (adict, types.DictionaryType) 

  adict = {'a': 1} Out [11]: Really [12]: Isinstance (adict, dict) Out [12]: Really [13]: Isinstance (adict, collection mapping) Out [13]: Really [14]: isinstance ( Adict, collections.MutableMapping) [14]: True    
 
 
  types DictType  and  types.DictionaryType  have been deprecated (well, removed in Python 3)  dict .  
  Archive. Mapping  and  collections. Matable Mapping  are  abstract  base classes (ABC) so that they work together Mapping that do not subclass from  dict  generally makes them a better choice , Although very stringent checks are helpful at times.  
 So basically, check the opposite  
     
  •  
     None of them,   
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     < Code> Archive. Mapping  If you do not need a mutation  
  •    
  •  
      dict  / Em> a  dict  type (it should be rare)   
  •  
      types.DictType  Or  types.DictionaryType  if you want to support  actually old  version

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