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Скачать или смотреть Understanding the TypeError: object of type 'types.GenericAlias' has no len() in Python

  • vlogize
  • 2025-03-31
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Understanding the TypeError: object of type 'types.GenericAlias' has no len() in Python
TypeError: object of type 'types.GenericAlias' has no len()python
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Описание к видео Understanding the TypeError: object of type 'types.GenericAlias' has no len() in Python

Learn how to fix the common Python error related to type annotations and list creation. Understand the right way to define lists of integers in Python to avoid the TypeError.
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This video is based on the question https://stackoverflow.com/q/73257548/ asked by the user 'Leong' ( https://stackoverflow.com/u/19704182/ ) and on the answer https://stackoverflow.com/a/73257649/ provided by the user 'Mathan' ( https://stackoverflow.com/u/7651504/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: TypeError: object of type 'types.GenericAlias' has no len()

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
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Understanding the TypeError: object of type 'types.GenericAlias' has no len() in Python

If you've encountered the error TypeError: object of type 'types.GenericAlias' has no len(), you're not alone. This issue is seen often by Python developers, especially those using type hinting in their functions. In this post, we'll explore what causes this error and provide clarity on how to properly implement type annotations in your Python code.

The Problem: What Causes the Error?

Object Type Confusion

In your original code, you attempted to define a list as follows:

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

Here, list[int] is used as a type hint indicating that the list should contain integers. However, the way you are trying to create the list is syntactically incorrect for Python. This results in Python interpreting the input as types.GenericAlias, which doesn't have a length, hence generating the error.

Related Error: Missing Positional Argument

When you attempted a different function call without the class context, the error:

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

This occurred because the function requires an instance of the class to access the method since it's an instance method.

The Solution: Correct List Definition

To avoid the TypeError, you need to correctly define your list. Here’s how to do it:

Using Square Brackets:
The simplest way to create a list in Python is to use square brackets instead of list[] syntax.

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

Using the list() Constructor:
Alternatively, you can create a list using the list() constructor with an iterable such as a tuple or another list.

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

Putting It All Together: Revised Code

Here’s the corrected version of your given code, with proper list definition and methods:

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

Key Points to Remember

Always define lists using square brackets or the list() constructor.

Make sure that when calling instance methods, you are using the appropriate class instance.

Type hints like list[int] are meant for indicating the intended type of elements in a list, not for list creation.

Conclusion

By following these guidelines, you will not only avoid the TypeError: object of type 'types.GenericAlias' has no len() but also improve the readability and maintainability of your code. Understanding how to properly use type hints and list creations in Python is crucial, especially as your applications grow in complexity. Happy coding!

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