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Learn how to solve the `NameError: name 'Dict' is not defined` error in Python by correctly importing necessary types from the `typing` module.
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This video is based on the question https://stackoverflow.com/q/77629105/ asked by the user 'nesly' ( https://stackoverflow.com/u/19751328/ ) and on the answer https://stackoverflow.com/a/77629128/ provided by the user 'Bilesh Ganguly' ( https://stackoverflow.com/u/6042824/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Fix NameError: name 'Dict' is not defined in Python Code

When working with Python, you might sometimes encounter the frustrating NameError. One common occurrence is when you see the message: NameError: name 'Dict' is not defined. This can happen when you try to use type annotations in your functions without having the necessary imports. In this guide, we'll explore the cause of this error and how to resolve it effectively.

Understanding the Problem

The error arises from a common issue in Python programming related to type hinting. In your specific case, you are attempting to define a function that uses Dict and List for type annotations, as shown below:

[[See Video to Reveal this Text or Code Snippet]]

The problem lies in the fact that Dict and List are not natively recognized by Python—it requires you to import them from the typing module.

Why Import from typing?

The typing module in Python provides support for type hints, which helps clarify the types of variables and function parameters in your code. By using this module, developers can enhance code readability and maintainability. The Dict and List types allow you to specify that a variable is a dictionary or a list, respectively.

Here’s how to import them properly:

To overcome the NameError, you need to include the following import statement at the beginning of your code:

[[See Video to Reveal this Text or Code Snippet]]

Example of a Complete Function

Here is your function with the necessary imports included:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By simply importing Dict and List from the typing module, you resolve the NameError issue and allow your Python function to utilize type annotations effectively. This not only prevents runtime errors but also enhances the clarity of your code, making it easier for others (and your future self) to understand its structure and functionality.

Now you're equipped to handle this common error in Python! Happy coding!