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Splitting a Python Dictionary into Multiple Dictionaries based on Values

Splitting a Python Dictionary into Multiple Dictionaries based on Values.

In Python, you can split a dictionary into multiple dictionaries based on the values it contains. This can be useful when you want to group the data in the dictionary based on certain criteria. Here is a step-by-step tutorial on how to achieve this.

Step 1: Create a Dictionary​

First, let's create a sample dictionary that we will use throughout this tutorial. The dictionary will contain key-value pairs, where the values will be used for splitting.

my_dict = {
    'apple': 10,
    'banana': 12,
    'orange': 9,
    'grape': 10,
    'kiwi': 12,
    'pineapple': 9
}

Step 2: Initialize an Empty Dictionary for Each Value​

Next, we need to initialize an empty dictionary for each unique value in the original dictionary. We will use the set() function to get the unique values from the dictionary.

unique_values = set(my_dict.values())
split_dicts = {value: {} for value in unique_values}

In this example, the split_dicts dictionary will have keys as the unique values from my_dict and empty dictionaries as their corresponding values.

Step 3: Iterate over the Original Dictionary​

Now, we need to iterate over the original dictionary and assign each key-value pair to the appropriate split dictionary based on its value.

for key, value in my_dict.items():
    split_dicts[value][key] = value

This code assigns the key-value pair to the split dictionary with the corresponding value.

Step 4: Print the Split Dictionaries​

Finally, we can print each split dictionary to see the result.

for value, split_dict in split_dicts.items():
    print(f"Dictionary with value {value}: {split_dict}")

This code will print each split dictionary separately along with its corresponding value.

Complete Example​

my_dict = {
    'apple': 10,
    'banana': 12,
    'orange': 9,
    'grape': 10,
    'kiwi': 12,
    'pineapple': 9
}

unique_values = set(my_dict.values())
split_dicts = {value: {} for value in unique_values}

for key, value in my_dict.items():
    split_dicts[value][key] = value

for value, split_dict in split_dicts.items():
    print(f"Dictionary with value {value}: {split_dict}")

Output​

The output of the above code will be:

Dictionary with value 10: {'apple': 10, 'grape': 10}
Dictionary with value 12: {'banana': 12, 'kiwi': 12}
Dictionary with value 9: {'orange': 9, 'pineapple': 9}

The original dictionary has been split into three separate dictionaries based on the values. Each split dictionary contains the keys and values that match a specific value from the original dictionary.

That's it! You have successfully split a Python dictionary into multiple dictionaries based on values.