What are some common errors when using collections in Python?

What are some common errors when using collections in Python?

Some common errors include using mutable types as dictionary keys, forgetting to import collections, and misusing list comprehensions.

Can you explain why mutable types can't be used as dictionary keys?

Mutable types like lists can change, which makes them unhashable. Dictionary keys must be immutable to ensure consistent access.

What about using sets? Are there common mistakes with them?

Yes, common mistakes with sets include trying to add mutable types like lists or dictionaries, which will raise a TypeError.

How can I avoid these errors in my code?

To avoid these errors, always use immutable types for keys, check your data types before adding to sets, and test your code frequently.