Скачать или смотреть How to Fix AttributeError: 'LogInPage' object has no attribute '_frame' in Tkinter

Resolve issues with Tkinter and frames in Python by learning how to correctly reference your classes and methods.
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This video is based on the question https://stackoverflow.com/q/69020975/ asked by the user 'AlvaroSt' ( https://stackoverflow.com/u/16808595/ ) and on the answer https://stackoverflow.com/a/69021499/ provided by the user 'acw1668' ( https://stackoverflow.com/u/5317403/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Fixing AttributeError: 'LogInPage' object has no attribute '_frame' in Tkinter

When working with Tkinter in Python, especially while creating applications that involve multiple frames, you may encounter an error that can be perplexing for many developers. One common issue is the AttributeError: 'LogInPage' object has no attribute '_frame'. If you have found yourself facing this issue while implementing a login page in Tkinter, you’re in the right place. In this guide, we’ll explain the problem and guide you through the solution step by step.

Understanding the Problem

What is the Error?

The error message indicates that your LogInPage class, which inherits from tk.Frame, is attempting to access an attribute called _frame that has not been defined for the LogInPage object. The traceback suggests that there is a call to the switch_frame method of the SampleApp class, which expects to manage frames within the SampleApp instance, not the LogInPage instance.

Why Does This Happen?

In the code you provided, there is a point in the login_user method of LogInPage where you attempt to switch to another frame using the following line:

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

Here, self refers to the instance of LogInPage, but the switch_frame method is defined in the SampleApp class, which expects to receive an instance of itself as the first argument, not LogInPage.

The Solution

Correcting the Method Call

To resolve this error, you need to modify the reference to the switch_frame method. Instead of calling it on SampleApp, you should call it on the instance of SampleApp. The correct line would look like:

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

Here’s the Revised login_user Method:

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

Understanding self.master

The self.master attribute is automatically set by Tkinter when a frame instance is created. In this case, it refers to the instance of SampleApp that created the LogInPage. By using self.master, you ensure that you are correctly referencing the SampleApp instance, allowing you to switch frames without issues.

Final Thoughts

Errors like AttributeError can be frustrating, but they often teach valuable lessons about how Python handles object references, especially in graphical applications like those built with Tkinter. By ensuring that you are correctly referencing the right instances when calling methods across different classes, you can avoid these common pitfalls.

Now that you understand both the problem and the solution, you can go ahead and implement the changes to your code. Happy coding!