Python: value => key

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1. list derivatives & dict deconstruction
   

   ebb = dict(zip('abcde', (11, 22, 11, 33, 22)))
   
   print(ebb)
   
   print([k for k, v in ebb.items() if v == 11])

    

2. filter
   

   ebb = dict(zip('abcde', (11, 22, 11, 33, 22)))
   
   print(ebb)
   
   print(dict(filter(lambda item: item[1] == 11, ebb.items())))

    

3. dict.keys() and dict.values() have the corresponding index
   

   ebb = dict(zip('abcde', (11, 22, 11, 33, 22)))
   
   print(ebb)
   
   print(tuple(ebb.keys())[tuple(ebb.values()).index(11)])

    

4. dict derivatives and deconstruction
   

   ebb = dict(zip('abcde', (11, 22, 11, 33, 22)))
   
   print(ebb)
   
   print({v: k for k, v in ebb.items()}[11])

    

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