Unexpected KeyError When Accessing Nested Dictionary Elements in Python
I'm following best practices but I'm stuck on something that should probably be simple... I've spent hours debugging this and I'm working on a project and hit a roadblock. I'm working with a `KeyError` when trying to access elements from a nested dictionary. I've structured my data to represent a user profile as follows: ```python user_profiles = { 'user1': {'name': 'Alice', 'age': 30, 'preferences': {'color': 'blue', 'food': 'pizza'}}, 'user2': {'name': 'Bob', 'age': 25, 'preferences': {'color': 'green', 'food': 'sushi'}} } ``` I want to retrieve the favorite food of a specific user, say `user1`. My code looks like this: ```python user_id = 'user1' try: favorite_food = user_profiles[user_id]['preferences']['food'] print(f"{user_id}'s favorite food is {favorite_food}") except KeyError as e: print(f"KeyError: {e} for user {user_id}") ``` However, I occasionally receive a `KeyError: 'food' for user user1'`, even though I can see that the structure is correct. I confirmed that accessing `'preferences'` works as expected. I even printed the entire `user_profiles[user_id]['preferences']` just before the failing line, and it returns `{'color': 'blue', 'food': 'pizza'}`. I've also checked if `user_id` has any leading or trailing whitespace, but that seems fine. Could this be a case of concurrent modification of the `user_profiles` dictionary, or am I overlooking something else? I'd appreciate any insights into why this might be happening. My Python version is 3.9.7, and I am running the code in a local script. For context: I'm using Python on macOS. Thanks for any help you can provide! Thanks for your help in advance! I'm working on a web app that needs to handle this. Any pointers in the right direction?