Скачать или смотреть Solving the Module Not Found Error in Python: A Beginner’s Guide

Discover how to fix the `Module Not Found Error` when running Python scripts in different folders. This guide offers clear solutions and best practices for beginners.
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This video is based on the question https://stackoverflow.com/q/70762459/ asked by the user 'Di Wang' ( https://stackoverflow.com/u/6201686/ ) and on the answer https://stackoverflow.com/a/70762696/ provided by the user 'NixonSparrow' ( https://stackoverflow.com/u/12775662/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Solving the Module Not Found Error in Python: A Beginner’s Guide

As a beginner in Python, it can be frustrating to run into errors that are hard to understand. One common issue you might encounter is the ModuleNotFoundError. This typically occurs when your script cannot find the module you are trying to import. In this post, we’ll explore a specific scenario that leads to this error and how you can resolve it effectively.

The Challenge: Understanding the Error

You have a project structured like this:

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

In your model folder, you have two Python files: __init__.py and abc.py. The code in abc.py defines a simple class ABC:

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

You then try to import this class in both main.py and new_main.py like so:

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

However, when you run the command python3 ./secondary-folder/new_main.py, you encounter the following error:

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

Why Does This Error Occur?

The reason for this error is quite simple but can be overlooked by beginners: Python looks for modules in the folder from which you run the script. When you executed new_main.py from the secondary-folder, Python was unable to find the model folder because it is not within the current working directory.

The Solution: Adjusting Your Import Statement

To fix this issue, you will need to adjust your import statement in new_main.py. Instead of importing the class from model.abc, you should specify the full path relative to the project directory. Here’s how to do it:

Change your import statement in new_main.py to the following:

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

Key Takeaway

Always consider the working directory: When coding in Python, the location from which you run your script is crucial in determining how imports are resolved.

When dealing with nested folders, it's good practice to specify the full path relative to the parent directory (in this case, project).

Conclusion

Understanding and resolving ModuleNotFoundError is essential for your development journey in Python. By following the solution outlined above, you’ll not only fix the error but also gain a deeper understanding of how Python manages modules and imports.

Remember to keep experimenting and learning as you continue to explore the wonderful world of Python programming. Happy coding!