How to Call Python Functions in If Else Statements with Streamlit

Описание: Explore a simple and effective method to call Python functions based on conditional statements using Streamlit. Learn how to structure your code for seamless function calls.
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This video is based on the question https://stackoverflow.com/q/73568547/ asked by the user 'lungsang' ( https://stackoverflow.com/u/17946386/ ) and on the answer https://stackoverflow.com/a/73568824/ provided by the user 'SIGHUP' ( https://stackoverflow.com/u/17580381/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Calling Python Functions Based on Conditions: A Guide for Streamlit Users

In the world of programming, conditional logic is crucial. You often need to execute specific actions based on user input or certain conditions. If you're using Streamlit to build interactive applications with Python, you may find yourself in a situation where you want to call different functions based on user selections. Recently, a user reached out with a common question: How to call Python functions in if-else statements? Let’s dive into understanding this problem and finding an effective solution.

The Problem at Hand

The user was trying to call specific functions based on whether the selected option was "upload from Google Drive" or "upload from computer". The initial attempt involved using simple if-else statements, like this:

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

However, they faced challenges getting it to work as intended. The goal is to streamline the function calls in a more efficient manner.

A Better Approach: Using a Dictionary to Map Options

To simplify function calls based on user choice, we can utilize a dictionary. In this setup, each option will correspond to its respective function as the value. Here's how to do it:

Step-by-Step Solution

Define Your Functions: Ensure your functions in the class are static (if they don't depend on instance variables) and structured properly.

Create a Dictionary of Options: Map user-friendly strings to the corresponding functions.

Capture User Input: Use st.radio() to allow users to select their desired action.

Call the Function from the Dictionary: Use the selected key to invoke the function directly from the dictionary.

Implementing the Solution

Below is the restructured code that implements these steps effectively:

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

Explanation of the Code

Class Definition: The Gdrive class contains two static methods (gdrivee and local) that represent the actions to be taken when uploading files.

Dictionary Setup: A dictionary named options maps descriptive strings to their corresponding function references. This makes it easy to add more options in the future without complicating the logic.

User Input: st.radio lets users select between "upload from google drive" and "upload from computer".

Direct Function Call: By accessing the user's selection in the options dictionary, we can directly invoke the correct function without additional if-else checks.

Conclusion

Using a dictionary to map user options to functions simplifies the process of managing conditional logic in Python, especially in an interactive environment like Streamlit. This approach not only enhances code readability but also makes it easier to maintain and expand as your application grows. Now, you can confidently implement dynamic functionality based on user input in your applications!

Feel free to try this approach in your own projects and take advantage of the improved organization and efficiency. Happy coding!