I'm getting a KeyError: 200 when iterating through a dictionary. What could be the issue?

If you're getting a KeyError during iteration, it likely means you're modifying the dictionary (adding or deleting keys) while iterating over it. This can invalidate the iterator. To avoid this, iterate over a copy of the dictionary's keys using `for key in list(my_dict.keys()):`. Alternatively, use a dictionary comprehension to create a new dictionary based on the original.