Python: value => key

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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])

filter

ebb = dict(zip('abcde', (11, 22, 11, 33, 22)))

print(ebb)

print(dict(filter(lambda item: item[1] == 11, ebb.items())))

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)])

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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