Скачать или смотреть Resolving ModuleNotFoundError in Flask: Importing Custom Modules Made Easy

A step-by-step guide to fix the `ModuleNotFoundError` in Flask when importing your custom modules. Learn how to structure your Python project for success!
---
This video is based on the question https://stackoverflow.com/q/73177234/ asked by the user 'Alex' ( https://stackoverflow.com/u/2730562/ ) and on the answer https://stackoverflow.com/a/73179553/ provided by the user 'nicktehboy meny' ( https://stackoverflow.com/u/19535637/ ) 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: Flask server does not recognize my own imported module (ModuleNotFoundError)

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.
---
Resolving ModuleNotFoundError in Flask: Importing Custom Modules Made Easy

If you're developing a Flask application and you've encountered a ModuleNotFoundError when trying to import your own custom modules, you're not alone. This is a common issue that can arise due to how Python manages modules and packages. In this guide, we'll explore the problem and guide you through a clear solution to ensure your server recognizes your custom modules seamlessly.

The Problem: Understanding the Error

When you try to run your Flask server or deploy it to Heroku, you might see an error message like this:

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

This typically indicates that Python is unable to locate your specified module, in this case, my_helpers.helper_1. The issue arises because Python needs to recognize that my_helpers is a package containing modules.

Your Current Import Statement

You mentioned that you included the following line in your main Python file:

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

This is correct under normal circumstances, but it requires certain conditions to be met for Python to successfully find and import my_helpers.

The Solution: Making Your Folder a Package

To resolve this issue, you'll need to ensure that the folder containing your modules is recognized as a package by Python. Here’s how to do that:

Step 1: Create the __init__.py File

The first step is to place an __init__.py file inside the my_helpers folder. Here’s how you can do that:

Navigate to the my_helpers folder in your project directory.

Create a new file named __init__.py. You can leave this file empty, or add any initialization code if needed.

Step 2: Verify Your Project Structure

After creating the __init__.py file, your project structure should look something like this:

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

Step 3: Restart Your Flask Server

After making the changes, restart your Flask server or redeploy to Heroku. This will allow Python to recognize my_helpers as a package, enabling you to import its modules without any issues.

Conclusion: Troubleshooting Your Flask Imports

By ensuring that your folders are properly structured as packages with an __init__.py file, you can avoid the common pitfalls associated with module imports in Python. Should you encounter similar errors in the future, always check:

That your module paths are correct.

That any necessary __init__.py files are present.

The overall structure of your project.

With this simple fix, your Flask server should run smoothly, allowing you to harness the power of custom modules in your applications. Happy coding!