How to Remove Key-Value Pairs from a Dictionary Based on Values in Python

How to Remove Key-Value Pairs from a Dictionary Based on Values in Python ?

Answer

To remove key-value pairs from a dictionary based on values in Python, you can use a dictionary comprehension or a loop to identify and remove the pairs that match the specified value.

✐ Examples

1 Removing Key-Value Pairs Based on Values Using a Dictionary Comprehension

We can remove key-value pairs from a dictionary in Python based on their values using a dictionary comprehension to create a new dictionary without the pairs that match the specified value. This example demonstrates how to achieve this and print the dictionary contents before and after the removal.

For example,

We start by declaring and initializing a dictionary named my_dict with integer keys and string values.
We print the dictionary contents before removing key-value pairs.
We use a dictionary comprehension to create a new dictionary without the pairs that match the specified value.
We print the dictionary contents after removing the key-value pairs.

Python Program

my_dict = {
    1: 'One',
    2: 'Two',
    3: 'Three',
    4: 'Two'
}

# Print the dictionary contents before removal
print('Dictionary contents before removal:')
for key, value in my_dict.items():
    print(f'Key: {key}, Value: {value}')

# Value to remove
value_to_remove = 'Two'

# Remove key-value pairs based on value using a dictionary comprehension
my_dict = {k: v for k, v in my_dict.items() if v != value_to_remove}

# Print the dictionary contents after removal
print('Dictionary contents after removal:')
for key, value in my_dict.items():
    print(f'Key: {key}, Value: {value}')

Output

Dictionary contents before removal:
Key: 1, Value: One
Key: 2, Value: Two
Key: 3, Value: Three
Key: 4, Value: Two
Dictionary contents after removal:
Key: 1, Value: One
Key: 3, Value: Three

2 Removing Key-Value Pairs Based on Values Using a Loop

We can remove key-value pairs from a dictionary in Python based on their values using a loop to identify and remove pairs that match the specified value. This example demonstrates how to achieve this and print the dictionary contents before and after the removal.

For example,

We start by declaring and initializing a dictionary named my_dict with integer keys and string values.
We print the dictionary contents before removing key-value pairs.
We use a loop to identify and remove pairs that match the specified value.
We print the dictionary contents after removing the key-value pairs.

Python Program

my_dict = {
    1: 'One',
    2: 'Two',
    3: 'Three',
    4: 'Two'
}

# Print the dictionary contents before removal
print('Dictionary contents before removal:')
for key, value in my_dict.items():
    print(f'Key: {key}, Value: {value}')

# Value to remove
value_to_remove = 'Two'

# Identify keys to remove
keys_to_remove = [k for k, v in my_dict.items() if v == value_to_remove]

# Remove identified keys
for key in keys_to_remove:
    del my_dict[key]

# Print the dictionary contents after removal
print('Dictionary contents after removal:')
for key, value in my_dict.items():
    print(f'Key: {key}, Value: {value}')

Output

Dictionary contents before removal:
Key: 1, Value: One
Key: 2, Value: Two
Key: 3, Value: Three
Key: 4, Value: Two
Dictionary contents after removal:
Key: 1, Value: One
Key: 3, Value: Three

Summary

In this tutorial, we learned How to Remove Key-Value Pairs from a Dictionary Based on Values in Python language with well detailed examples.

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How to Remove Key-Value Pairs from a Dictionary Based on Values in Python