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Struggling to import your own Python module? Discover the common pitfalls and learn how to successfully import your custom classes with this comprehensive guide.
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This video is based on the question https://stackoverflow.com/q/67019357/ asked by the user 'Mateusz H.' ( https://stackoverflow.com/u/7504707/ ) and on the answer https://stackoverflow.com/a/67019428/ provided by the user 'DeGo' ( https://stackoverflow.com/u/9071288/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Why Can't I Import My Own Module to My Python Code? Here's the Solution!

If you're a Python programmer, you may have faced the frustrating issue of not being able to import your custom modules. You’re not alone! Many developers encounter this problem, especially when they have a directory structure similar to the following:

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

In this case, you have a file called worksheet.utilities.py where you've defined a class named WorkSheetUtilities, and you want to use this class in your main.py file. Unfortunately, it seems like the standard import statements aren’t working for you, despite multiple attempts to resolve the issue. Let's take a closer look at how to fix this.

Understanding the Problem

When trying to import modules in Python, the issue often arises from the way the files and directories are structured. Here are some key points to consider:

Module Naming Conventions: Python has specific rules regarding how modules (and filenames) can be named. Using dots (.) in module names can create problems.

Relative vs Absolute Imports: Depending on how your files are laid out, relative imports (e.g., using ..) can sometimes lead to confusion and errors.

The Solution

Step 1: Rename the Module

One of the simplest solutions to your import issue is to rename the worksheet.utilities.py file. Instead of using a dot in the filename, which Python interprets as a package or submodule, you could rename it to something like worksheet_utilities.py. This avoids ambiguity and aligns better with Python's module naming conventions.

Step 2: Update Your Import Statement

Once you have renamed the file, updating your import statement is quite straightforward. You can use the following line of code in your main.py file:

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

Additional Tips

Check Your PYTHONPATH: Ensure that the directory containing your modules is included in the Python path. You can print sys.path in your script to check which directories are being searched for modules.

Avoid Using Wildcards in Imports: While import * may seem convenient, it can lead to namespace pollution and should generally be avoided. Instead, consider importing only the specific classes or functions you need:

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

Use Absolute Imports Where Possible: While relative imports can work in specific situations, absolute imports (like the ones suggested above) are more straightforward and usually preferable.

Conclusion

Importing your own modules in Python doesn’t have to be a headache. By following the steps outlined in this post—renaming your module and adjusting your import statement—you should now be able to successfully import your custom classes without any issues.

Keep experimenting with Python, and happy coding!