Python program to change the value of a dictionary if it equals K

Python program to change the value of a dictionary if it equals K

Let's create a tutorial on how to change the value of dictionary items if they equal a given value, K.

Objective:

Given a dictionary and a value K, we want to replace all occurrences of K in the dictionary values with a new value.

Approach:

  1. Iterate through the items of the dictionary.
  2. For each item, check if its value equals K.
  3. If it does, update the value to the new desired value.

Step-by-step Implementation:

  1. Initialize the dictionary:

    data = {"a": 5, "b": 10, "c": 5, "d": 20}

  2. Define the value to be replaced and the new value:

    K = 5 new_value = 100

  3. Iterate and replace:

    For each key-value pair in the dictionary, check if the value equals K. If it does, replace it with new_value.

    for key, value in data.items(): if value == K: data[key] = new_value

  4. Print the updated dictionary:

    print(data)

Complete Program:

def replace_value_in_dict(data, K, new_value): for key, value in data.items(): if value == K: data[key] = new_value return data # Test the function data = {"a": 5, "b": 10, "c": 5, "d": 20} K = 5 new_value = 100 print(replace_value_in_dict(data, K, new_value))

Expected Output:

For the provided test dictionary and values, the output should be:

{'a': 100, 'b': 10, 'c': 100, 'd': 20}

Explanation:

The function iterates through each key-value pair in the dictionary. When it finds a value that matches K, it replaces that value with new_value. For the example provided, the values "5" for keys "a" and "c" are replaced by "100".

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