How to Assign and Access Variable Values from Another Module in Python

Discover how to efficiently `assign` and `access` variable values between modules in Python with our step-by-step guide and practical examples.
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How to Assign and Access Variable Values from Another Module in Python

When working with multiple modules in Python, you may encounter scenarios where you need to share variables between them. A common issue arises when you try to assign values in one module and access them in another, but encounter empty results. In this guide, we will explore the solution to this problem using a structured approach that simplifies the sharing of variable values between modules.

The Problem

Let's consider an example scenario where you have two modules: main and utils. In the utils module, you've defined two global variables, cod_user and name_user. In your main module, you need to assign values to these variables in class A, and later retrieve them in class B. However, you find that when you try to access these variables in class B, the values are empty.

Here’s a simplified version of the initial code:

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

As you can see, the values assigned in class A do not affect the global variables in the utils module. This leads to an important lesson on variable scope in Python.

The Solution: Using a Class to Hold Shared Data

To address this issue, we can create a separate class in the utils module to serve as a container for our shared data. This way, any class can access and modify the variables directly.

Step 1: Create a Utils Class

Instead of using global variables, define a class that will hold the data you want to share:

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

This class will act as a centralized location for your shared variables.

Step 2: Assign Values in Class A

Now, modify your class A to use the variables from the Utils class rather than trying to assign them directly to global variables:

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

Step 3: Retrieve Values in Class B

Finally, modify class B to access the values from the Utils class:

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

Conclusion

This approach of defining a class to hold shared data makes it easy to assign and access variable values between different modules in Python. Whether you choose to encapsulate your variables in a class, like we did with Utils, or use the global keyword, it's essential to understand how variable scope works to manage your data effectively.

Remember that using global variables may complicate tracking changes in larger applications, so encapsulating shared data within a class is often a cleaner solution.

By applying this knowledge, you can efficiently share data across modules and streamline your programming efforts in Python. Happy coding!