What's the 'keyerror' in python and how to handle it?

A `KeyError` in Python is raised when trying to access a dictionary key that doesn't exist.

Example:

my_dict = {}
value = my_dict['key']

Solution:

value = my_dict.get('key', 'default_value')

Use the `get` method of dictionaries to provide a default value if a key doesn't exist.