Write a function find_key(input_dict, target_value) that takes as parameters a dictionary and a target value and returns the key in the dictionary that maps to the target value or None if no such key exists. In other words, the function finds the key such that input_dict[key] == target_value.Notes:You may assume that the target_value only appears once in the dictionary and therefore there will be only one key that maps to the target.Hint: You need to iterate over all the keys, as this task is effectively using the dictionary backwards.For example: TestResulttest_dictionary = {100:'a', 20:'b', 3:'c', 400:'d'} print(find_key(test_dictionary, 'b'))20test_dictionary = {100:'a', 20:'b', 3:'c', 400:'d'} print(find_key(test_dictionary, 'e'))None

Python # define a function that takes dictionary and a value as inputdef find_key(input_dict,…

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Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Write a function find_key(input_dict, target_value) that takes as parameters a dictionary and a target value and returns the key in the dictionary that maps to the target value or None if no such key exists. In other words, the function finds the key such that input_dict[key] == target_value.

Notes:

You may assume that the target_value only appears once in the dictionary and therefore there will be only one key that maps to the target.
Hint: You need to iterate over all the keys, as this task is effectively using the dictionary backwards.

For example:

Test	Result
test_dictionary = {100:'a', 20:'b', 3:'c', 400:'d'} print(find_key(test_dictionary, 'b'))	20
test_dictionary = {100:'a', 20:'b', 3:'c', 400:'d'} print(find_key(test_dictionary, 'e'))	None

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