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How to convert a dictionary to a dictionary of unique values and their frequencies in Python

How to convert a dictionary to a dictionary of unique values and their frequencies in Python.

Here's a detailed step-by-step tutorial on how to convert a dictionary to a dictionary of unique values and their frequencies in Python.

Step 1: Create a dictionary​

First, let's start by creating a dictionary with some sample data. This dictionary can contain any key-value pairs you want. For this tutorial, let's create a dictionary called original_dict.

original_dict = {'apple': 2, 'banana': 3, 'orange': 2, 'grape': 1, 'kiwi': 3}

Step 2: Initialize an empty dictionary​

Next, we need to initialize an empty dictionary that will store the unique values and their frequencies. Let's call this dictionary unique_dict.

unique_dict = {}

Step 3: Iterate through the original dictionary​

Now, we need to iterate through each key-value pair in the original_dict using a for loop. For each iteration, we'll check if the value already exists as a key in the unique_dict. If it does, we'll increment the frequency count. If it doesn't, we'll add the value as a key in the unique_dict with a frequency count of 1.

for key, value in original_dict.items():
    if value in unique_dict:
        unique_dict[value] += 1
    else:
        unique_dict[value] = 1

Step 4: View the result​

To see the final result, you can print the unique_dict dictionary. This will display the unique values as keys and their corresponding frequencies as values.

print(unique_dict)

Step 5: Complete code example​

Here's the complete code example that you can run:

original_dict = {'apple': 2, 'banana': 3, 'orange': 2, 'grape': 1, 'kiwi': 3}
unique_dict = {}

for key, value in original_dict.items():
    if value in unique_dict:
        unique_dict[value] += 1
    else:
        unique_dict[value] = 1

print(unique_dict)

This will output:

{2: 2, 3: 2, 1: 1}

In this example, the unique values '2', '3', and '1' from the original_dict dictionary are the keys in the unique_dict, and their corresponding frequencies are the values.

You can modify the original_dict with your own data and the code will still work the same way. You can also use this code as a function and pass your dictionary as an argument to convert it to a dictionary of unique values and their frequencies.