Resolving the NameError in Python: Understanding Variable Scope Between Modules

Learn how to fix the `NameError` when importing functions and variables from different modules in Python. This guide explains the pitfalls of global variables and demonstrates better coding practices.
---

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: Python error when using an object from a script in a function imported from another script

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Resolving the NameError in Python: Understanding Variable Scope Between Modules

When working with modules in Python, you might find yourself in a situation where you receive an error that seems perplexing at first. A common issue arises when trying to use a variable defined in one module inside a function from another module. This often leads to a NameError, indicating that the variable is not recognized. In this post, we will explore the cause of this error and provide effective solutions to avoid it.

Understanding the Issue

Here's the initial code:

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

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

When you run this code, you encounter the error:

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

Why Does This Error Occur?

The Problem with import *

Solution: Correcting the Scope Issue

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

A Better Approach

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

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

By passing i directly to the function test, we eliminate the reliance on module-level global variables while improving code readability and maintainability.

Conclusion

In summary, encountering NameError when using variables across modules is a common issue rooted in the scope of variables and the use of global. By directly assigning variables within the appropriate module or refactoring your functions to accept parameters, you can solve this problem effectively. Adopting best coding practices not only helps avoid errors but also leads to cleaner, more efficient code.

Cheers, and happy coding!