What are some common mistakes with type annotations in Python?
An example of an AI chatbot conversation about common mistakes with type annotations.
What are some common mistakes with type annotations in Python?
Some common mistakes include using incorrect types, not using type hints consistently, and misunderstanding optional types.
Can you give an example of using incorrect types?
Sure! A common mistake is annotating a function parameter as 'int' but passing a 'str' instead, which leads to runtime errors.
What about optional types? How do people misunderstand them?
Many people think that using 'Optional[int]' means the value can only be 'None' or 'int', but it actually means it can be 'None' or any 'int'.
How can I avoid these mistakes?
To avoid these mistakes, always review your type annotations, use static type checkers like mypy, and follow consistent coding standards.
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