Solving the Undefined Issue When Using Node Child Process with Python Scripts

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The Problem

Here's a quick summary of what you might have done incorrectly:

You attempted to use await on an event handler, which resulted in returning undefined. The event listeners do not return a value that you can await; they are designed for callbacks instead.

The Solution

Utilizing Promises for Child Process Management

Create a Function for Child Process Output:

This function will spawn the child process, collect the data from its output, and resolve the promise with that data.

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

Update Your Original Function:

Modify your original function to use the newly created getChildProcessOutput function to get the score.

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

Calling the Function:

In your server code, you can safely call this function and expect the correct output.

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

Key Takeaways

Promises and Async/Await: Remember that using async/await requires proper promise management, especially with systems designed around callbacks.

By incorporating the use of promises into your child process management, you can effectively address the undefined value issue and ensure that your function returns the data it was intended to. Happy coding!