How to Call Methods Inside Another Method in a Different Class in Python

Discover the correct way to call methods from a different class in Python, overcome common errors, and enhance your coding skills.
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Navigating Method Calls Across Classes in Python

In object-oriented programming, particularly in Python, you often find the need to call methods inside another method that exists in a different class. This can be a bit tricky, especially if you're new to the language or to the principles of object-oriented design. In this guide, we'll discuss a common problem: how to call a method from one class inside another method of a different class, and how to effectively resolve errors that may arise during this process.

The Problem at Hand

Suppose you have two classes: monitorRunner and BestBuyMonitor. You want to execute a method from BestBuyMonitor inside a method of monitorRunner, but you're facing an issue. Your Python code triggers an AttributeError that states:

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This error indicates that Python cannot find the getAPiData method because it's inside the BestBuyMonitor class and not monitorRunner. Let's break down how to fix this and successfully call methods between these classes.

Solution: Instantiate the Class Properly

The solution is straightforward once you understand the concept of class instantiation—you need to create an instance (or object) of the BestBuyMonitor class before calling its methods. Here's how to modify your code to fix the error.

Here's the Revised Code

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Key Changes Made

Instantiate the Class: Notice that we have added parentheses () after bb.BestBuyMonitor in the executeLink method. This creates an object of the BestBuyMonitor class, allowing us to access its methods.

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

Understanding the Flow

Here’s a quick breakdown of the flow of execution in this code:

The monitorRunner class is initialized when the script is run.

The executeLink method is invoked, which in turn calls determineStore() to set the store variable.

Then, it creates an instance of BestBuyMonitor and invokes the executeBestBuyMonitor method, passing the store and url variables.

Conclusion

Calling methods inside another method that belongs to a different class can be confusing, but with a solid grasp of how to instantiate classes and objects, you can seamlessly navigate this challenge. By following the outlined solution, you should be able to resolve the AttributeError and efficiently call methods across classes in Python.

If you encounter similar issues in your programming journey, remember—the answer often lies in understanding object-oriented principles and class instantiation. Happy coding!