Resolving ModuleNotFoundError in Python: Importing Modules in Subdirectories

Learn how to fix the common `ModuleNotFoundError` in Python when working with modules across different directories. Discover effective solutions and coding best practices.
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Resolving ModuleNotFoundError in Python: Importing Modules in Subdirectories

When working on Python projects, you may run into a frustrating error known as ModuleNotFoundError. This can occur when your code attempts to import a module that cannot be found. A common scenario involves calling functions from modules in different directories, particularly when you have a structured file hierarchy. In this guide, we'll explore a specific case that illustrates this issue and how to resolve it effectively.

The Problem

Consider the following Python file structure:

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The Error Encountered

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The Solution

To resolve the ModuleNotFoundError, you have a couple of options. Let's break them down:

Solution 1: Adjust the File Location

Solution 2: Update the Import Statement

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This adjustment does the following:

Try to Import: Initially attempts to import mytest assuming it might be in the same directory.

Fall Back: If that fails (and raises an ImportError), the code then tries to import mytest from the scripts directory.

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Summary

By implementing one of the above solutions, you can effectively resolve the ModuleNotFoundError and ensure that your modules can be imported successfully across different directories. This allows your Python programs to run smoothly, utilizing the functionality of various modules without interruption.

Feel free to try these solutions with your own projects, and get comfortable navigating module imports in Python!