Python – Remove keys with Values Greater than K ( Including mixed values )

Last Updated : 27 Jan, 2025

We are given a dictionary we need to remove the keys with values greater than K. For example, we are given a dictionary d = {‘a’: 1, ‘b’: 5, ‘c’: ‘hello’, ‘d’: [1, 2, 3]} we need to remove the keys with value greater than K so that output should be {‘a’: 1, ‘c’: ‘hello’, ‘d’: [1, 2, 3]}. We can use approach like dictionary comprehension, del method and multiple approaches for this.

Using Dictionary Comprehension

Dictionary comprehension allows us to filter key-value pairs based on a condition creating a new dictionary with only desired items.

Python

d = {'a': 1, 'b': 5, 'c': 'hello', 'd': [1, 2, 3]}

# Use dictionary comprehension to filter out keys with values greater than K (e.g., K = 3)
d = {key: value for key, value in d.items() if (isinstance(value, (int, float)) and value <= 3) or not isinstance(value, (int, float))}
print(d)

Output

{'a': 1, 'c': 'hello', 'd': [1, 2, 3]}

Explanation:

Dictionary comprehension iterates through each key-value pair in d keeping only those where the value is less than or equal to 3 (for numeric values), or the value is not numeric (like strings or lists).
Modified dictionary {'a': 1, 'c': 'hello', 'd': [1, 2, 3]} is printed, excluding the key 'b' since its value (5) is greater than 3

Using `del` keyword

del keyword is used to remove a specific key-value pair from a dictionary by specifying the key. If the key exists it is deleted otherwise a KeyError is raised.

Python

d = {'a': 1, 'b': 5, 'c': 'hello', 'd': [1, 2, 3]}

# Iterate through the dictionary keys
for key in list(d.keys()):  # Use list() to avoid modifying the dictionary while iterating
    if isinstance(d[key], (int, float)) and d[key] > 3:  # Check if value is greater than K (e.g., 3)
        del d[key]  # Delete the key-value pair

print(d)

Output

{'a': 1, 'c': 'hello', 'd': [1, 2, 3]}

Explanation:

Code iterates over the keys of the dictionary d, checking if the value associated with each key is a numeric type (int or float) and greater than 3, and if so deletes the key-value pair.
Modified dictionary {'a': 1, 'c': 'hello', 'd': [1, 2, 3]} is printed, which excludes the key 'b' as its value (5) is greater than 3.

Using `pop()`

pop() method removes a key-value pair from a dictionary by specifying key and optionally returns the value. It can be used in a loop to remove keys with specific conditions such as values greater than a given threshold.

Python

d = {'a': 1, 'b': 5, 'c': 'hello', 'd': [1, 2, 3]}

# Iterate through the dictionary keys and remove keys with values greater than K (e.g., 3)
for key in list(d.keys()):
    if isinstance(d[key], (int, float)) and d[key] > 3:  # Check if value is greater than K
        d.pop(key)  # Remove the key-value pair using pop()
print(d)

Output

{'a': 1, 'c': 'hello', 'd': [1, 2, 3]}

Explanation:

Code iterates over keys of the dictionary d and checks if each value is numeric (int or float) and greater than the threshold K = 3. If so, it removes the key-value pair using the pop() method.
Modified dictionary {‘a’: 1, ‘c’: ‘hello’, ‘d’: [1, 2, 3]} is printed, where the key ‘b’ is excluded because its value (5) exceeds the threshold.