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Learn how to effectively use `subprocess.run` in Python to handle multiple inputs in your scripts, ensuring smoother execution of your programs.
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This video is based on the question https://stackoverflow.com/q/65153137/ asked by the user 'Dan P.' ( https://stackoverflow.com/u/8576070/ ) and on the answer https://stackoverflow.com/a/65153528/ provided by the user 'larsks' ( https://stackoverflow.com/u/147356/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Pass Multiple Inputs Using subprocess.run in Python 3.7+

When working with Python scripts, you may often find yourself needing to run one script from another. This scenario becomes more intricate when the script being executed requires multiple inputs. In this guide, we will explore how to pass multiple inputs to a script using subprocess.run in Python 3.7 and later.

Introduction to the Problem

Let’s say you have a script named input_test.py that accepts user input. Here's a simple example of how that script might look:

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

When you run this script directly, it prompts the user for their first name. However, if you want to run this script from another Python script, such as main.py, you can utilize the subprocess module, like this:

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

In this case, Dan is passed as input, successfully executing input_test.py. The challenge arises when we need to pass multiple inputs to a second script, input_test2.py, which requires both a first name and a last name:

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

Solution: Passing Multiple Inputs with subprocess.run

To pass multiple inputs to a script using the subprocess.run function, you must consider how the input() function works. Specifically, input() reads until it encounters a newline character (\n). Therefore, to simulate user inputs, you can separate your inputs with newline characters within a single string.

Here’s how you can achieve this:

Step-by-Step Process

Prepare Your Input String: Combine your inputs into a single string, separated by newline characters.

Use subprocess.run: Call subprocess.run with the combined input.

Example Code

Below is an example demonstrating how to pass multiple inputs to input_test2.py:

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

Output Explanation

When you run the above code, you will see:

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

This is because the script correctly processes the first input (Joe) and the second input (Biden), printing them together.

Conclusion

By understanding how to effectively manage inputs using subprocess.run, you can enhance the functionality of your Python scripts significantly. Passing multiple inputs is as simple as concatenating them with newline characters.

Key Takeaways

Use \n to separate inputs: When using subprocess.run(), remember to divide your inputs with newline characters for each input() call in your target script.

Capture Outputs: The capture_output=True option allows you to easily capture anything your script prints to stdout.

Adaptability: This method scales to more inputs by simply extending the input string with more newline-separated values.

With these techniques, you can now pass multiple inputs to any Python script seamlessly, improving your overall programming workflow!