Python Arena

Reverse Lookup

Sometimes you need to build a reverse lookup table, so you can search by the old value instead of the old key. Write a function invert_dict that receives a dictionary with string keys and unique string values. Return a new dictionary where every key and value have swapped places.

Примеры

Ввод
{"a": "x", "b": "y"}
Вывод
{"x": "a", "y": "b"}
Ввод
{}
Вывод
{}
Ввод
{"x": "y"}
Вывод
{"y": "x"}

Нужно реализовать

def invert_dict(d: dict) -> dict:

Теги

dicthashmap
PostgreSQLv16
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Visible tests
1
Input
{"a":"x","b":"y"}
Expected{"x":"a","y":"b"}
2
Input
{}
Expected{}
3
Input
{"x":"y"}
Expected{"y":"x"}
4
Input
{"one":"1","two":"2","three":"3"}
Expected{"1":"one","2":"two","3":"three"}
5
Input
{"k":"v"}
Expected{"v":"k"}
6
Input
{"a":"b","c":"d"}
Expected{"b":"a","d":"c"}
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