get key from value code example

Example 1: how to get key of a particular value in dictionary python using index

mydict = {'george': 16, 'amber': 19}
print(list(mydict.keys())[list(mydict.values()).index(16)])  # Prints george

Example 2: java map get the key from value

public static <T, E> Set<T> getKeyByValue(Map<T, E> map, E value) {
    return map.entrySet()
              .stream()
              .filter(entry -> Objects.equals(entry.getValue(), value))
              .map(Map.Entry::getKey)
              .collect(Collectors.toSet());
}

Example 3: get key from a value

person = {'name': 'Phill', 'age': 22}

print('Name: ', person.get('Phill'))
print('Age: ', person.get('age'))

# value is not provided
print('Salary: ', person.get('salary'))

# value is provided
print('Salary: ', person.get('salary', 0.0))