How to Use a Tkinter Combobox to Select Dictionary Keys in Python

Описание: Learn how to efficiently use `Tkinter Combobox` to select dictionary keys and print their corresponding values. Perfect for beginners!
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Mastering the Tkinter Combobox: Selecting Dictionary Keys and Printing Values

If you're new to Python and specifically to building GUI applications with Tkinter, you might encounter scenarios where you want to select elements from a dropdown (combobox) and retrieve values associated with those selections. In this guide, we will tackle a common problem: selecting keys from a dictionary via Tkinter comboboxes and printing the corresponding values upon submission.

Understanding the Problem

Imagine you have a dictionary that contains various paper sizes, including their corresponding dimensions:

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You may want to allow users to select two different paper sizes via two separate comboboxes and then print their corresponding dimensions. However, you've run into trouble: instead of outputting the dimensions, you're only printing the selected keys.

The Solution

To fix this, you'll need to modify how your button click event retrieves data from the comboboxes. Let's break it down step by step.

Step 1: Set Up Your Tkinter GUI

First, we will create a basic Tkinter window with two comboboxes for the paper size selection. Here’s the setup code you will start with:

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Step 2: Define the Submit Function

Instead of simply printing the selected key, modify the submit_button function to access the corresponding values from the Paper_sizes dictionary:

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Here’s the breakdown:

key1 and key2 retrieve the selected keys from each combobox.

By looking up these keys in the Paper_sizes dictionary, we can print the associated values, i.e., the dimensions.

Step 3: Complete Your Tkinter Setup

Finally, you need to add the button that triggers the submit_button function:

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

This completes the program, allowing you to select paper sizes and print their dimensions upon clicking the "Submit" button.

Conclusion

With these modifications, your Tkinter application should now function as intended. When you select, for example, A4 in the first combobox and A7 in the second, pressing the "Submit" button will output:

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

Instead of just printing the key names. This simple yet effective technique can enhance user experience by providing meaningful feedback from their selections. Happy coding, and feel free to reach out if you have further questions!