Dictionary Modification

Dictionaries are mutable, allowing dynamic changes to their contents.

1. Adding New Key-Value Pairs

Assign a value to a new key using square bracket notation.

python config = {'mode': 'default'} config['port'] = 8080 # Add new key 'port' config['timeout'] = 300 print(config) # {'mode': 'default', 'port': 8080, 'timeout': 300}

2. Modifying Existing Values

Assign a new value to an existing key.

python user = {'name': 'Alice', 'status': 'offline'} user['status'] = 'online' # Overwrite the 'status' value print(user) # {'name': 'Alice', 'status': 'online'}

3. Removing Key-Value Pairs

a) del Statement

Deletes the pair by key.

python del user['status'] print(user) # {'name': 'Alice'}

b) .pop() Method

Removes the item with the given key and returns the corresponding value (similar to list pop).

python data = {'a': 1, 'b': 2, 'c': 3} value_b = data.pop('b') print(f"Removed value: {value_b}") # 2 print(data)

c) .clear() Method

Removes all items from the dictionary.

python data.clear() print(data) # {}