Скачать или смотреть Resolving the ImportError: DLL load failed while importing QtWidgets in PyQt5 Apps with PyInstaller

Learn how to fix the `ImportError: DLL load failed while importing QtWidgets` error when running PyQt5 applications packaged with PyInstaller in Python.
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Understanding the ImportError in PyQt5 and PyInstaller

When working with PyQt5 applications packaged using PyInstaller, a common error that developers encounter is the ImportError: DLL load failed while importing QtWidgets. This error can stem from various issues related to incorrect configurations, missing dependencies or DLL files, making it a frustrating barrier in the development process. In this guide, we will explore the potential reasons behind this error and provide a clear solution to resolve it.

The Problem

You may experience this error when you run the executable file generated by PyInstaller. The traceback will often point to your main script, indicating an issue with importing QtWidgets. This is typically due to the improper handling of dependencies during the packaging process with PyInstaller.

Symptoms of the Error

Encountering ImportError when starting your application.

Warnings about missing modules in the warn.txt file generated by PyInstaller during the build process.

Steps to Resolve the Issue

Step 1: Review Your Imports

First, let’s ensure that your imports in the Python script are properly structured. In your specific case, the script includes:

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Make sure that you are not inadvertently causing conflicts in your dependencies.

Step 2: Modify the .spec File

Your .spec file should be examined closely to ensure that necessary hidden imports are properly listed. For your current configuration, consider adding or modifying your hiddenimports section. Here's a review of what it currently looks like:

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You may also want to experiment with updating PyQt5 or including other related libraries like pandas in the hidden imports, as they sometimes interact unexpectedly.

Step 3: Introduce a Workaround

Interestingly, a workaround that many developers have discovered is to explicitly import pandas before importing any PyQt5 components. In your main script, adjust the order of imports as such:

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By following this adjustment, many users have reported that it resolved their import issues.

Step 4: Rebuild Your Application

After making changes to your code and the .spec file, it’s essential to rebuild your application using PyInstaller. Run the following command in your terminal, replacing your_app.spec with the name of your spec file:

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Step 5: Test the Executable

After rebuilding, attempt to run the generated executable again. If you still experience issues, double-check the warn.txt file for any further clues regarding missing modules, and ensure your environment paths are correctly defined.

Conclusion

The error message ImportError: DLL load failed while importing QtWidgets can be frustrating, but with the steps outlined above, you should be able to systematically resolve the issue. Remember to check your installed library versions, ensure all dependencies are included and experiment with the order of your imports. Happy coding!