Remove Keys from Dictionary Starting with K – Python

We are given a dictionary we need to remove the Keys which are starting with K. For example we are give a dictionary d = {‘Key1’: ‘value1’, ‘Key2’: ‘value2’, ‘other_Key’: ‘value3’} so that the output should be {‘other_Key’: ‘value3’}

Using Dictionary Comprehension

Using dictionary comprehension we can filter out Key-value pairs where the Key starts with the letter “K” by checKing if not Key.startswith(‘K’)

d = {'key1': 'value1', 'key2': 'value2', 'other_key': 'value3'}

# Dictionary comprehension to create a new dictionary that excludes keys starting with 'K'
d = {key: value for key, value in d.items() if not key.startswith('k')}

print(d)

{'other_key': 'value3'}

Explanation:

• Dictionary comprehension iterates over the Key-value pairs and excludes those where the Key starts with the letter “K” using not Key.startswith(‘K’).
• A new dictionary is created that only includes the Key-value pairs where the Key does not begin with “K”

Using del in a Loop

Code safely iterates over a list of keys using list(d.keys()). If a key starts with “K”, it is removed from the dictionary using del.

d = {'Key1': 'value1', 'Key2': 'value2', 'other_key': 'value3'}

# Iterate over a list of the dictionary's keys (to avoid modifying the dictionary while iterating)
for key in list(d.keys()):
    # Check if the key starts with the letter 'K'
    if key.startswith('K'):
        # If the key starts with 'K', remove it from the dictionary
        del d[key]
print(d)

{'other_key': 'value3'}

Explanation:

• Code creates a list of dictionary Keys (list(d.Keys())) to avoid modifying the dictionary while iterating over it.
• It checks if a Key starts with the letter “K” and deletes those Key-value pairs from the dictionary using del.

Using pop()

We can use pop() method to remove Keys that start with “K.”

d = {'Key1': 'value1', 'Key2': 'value2', 'other_key': 'value3'}

# Iterate over a list of the dictionary's keys (to avoid modifying the dictionary while iterating)
for key in list(d.keys()):
    # Check if the key starts with the letter 'K'
    if key.startswith('K'):
        # If the key starts with 'K', remove it from the dictionary using pop()
        d.pop(key)

print(d)

{'key1': 'value1', 'key2': 'value2', 'other_key': 'value3'}

Explanation:

• list(d.Keys()) creates a list of Keys to safely iterate through the dictionary while modifying it.
• Key.startswith(‘K’) checKs if the current Key starts with letter “K”.
• d.pop(Key) removes the Key-value pair from the dictionary using the pop() method.

Using dict.copy()

We can create a shallow copy of the dictionary and then remove the Keys from it.

d = {'Key1': 'value1', 'Key2': 'value2', 'other_key': 'value3'}

# Create a new dictionary excluding keys starting with 'k'
a = {key: value for key, value in d.items() if not key.startswith('K')}
print(a)

{'other_key': 'value3'}

Explanation:

• Dictionary Comprehension It iterates over the key-value pairs in the original dictionary d and includes those where the key does not start with “K”.
• Filtered Dictionary a new dictionary a is created excluding the key-value pairs with keys starting with the letter “K”.

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Article Tags :

• Python
• Python Programs
• Python dictionary-programs

Practice Tags :

• python