If you try to add a new key to a dictionary that already exists, the behavior depends on whether the key is already present in the dictionary:
- If the key already exists, its associated value will be updated to the new value you provide.
- If the key does not exist, the key and its associated value will be added to the dictionary.
No error occurs in either case; Python dictionaries allow you to add new keys or update existing keys seamlessly. For example:
python
my_dict = {'a': 1, 'b': 2}
my_dict['b'] = 3 # Updates existing key 'b' with new value 3
my_dict['c'] = 4 # Adds new key 'c' with value 4
After this, my_dict will be {'a': 1, 'b': 3, 'c': 4}. Similarly, using the
update() method with another dictionary or iterable of key-value pairs will
add new keys or update existing keys accordingly. Therefore, the correct
answer is:
- The key and its associated value will be updated if the key exists.
- The key and its associated value will be added if the key does not exist.
No error occurs in either case
