Pass Values from bash Script to python Script

Learn how to easily pass variables from a bash script to a Python script, allowing for dynamic execution and configuration of your code in High-Performance Computing environments.
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This video is based on the question https://stackoverflow.com/q/71497275/ asked by the user 'TheyTakingTheHobbitsToIsengard' ( https://stackoverflow.com/u/17380763/ ) and on the answer https://stackoverflow.com/a/71497527/ provided by the user 'Alexll7' ( https://stackoverflow.com/u/18464930/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Introduction

In the world of High-Performance Computing (HPC), scripting plays an essential role in automating tasks and improving efficiency. One common challenge developers face is how to pass values from a bash script to a Python script effectively. This can become particularly crucial when you want your Python script to utilize dynamic values set in the bash environment. In this post, we'll break down how to achieve this goal, making it easier for you to configure your scripts according to your needs.

The Problem: Setting Variables in Bash for Python Scripts

You may have a bash script for executing a Python script. However, you want to set certain variables within your bash script that can seamlessly float into your Python script, thereby allowing for greater flexibility. For example, variables like repeat and directory defined in your Python script can be replaced with values set in your bash script. So, how can we do that?

Example Bash Script

Here is a typical bash script you might be using:

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

And in your Python script, you have something like this:

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

The Solution: Passing Variables Using Command-Line Arguments

To solve the problem of passing values from the bash script to the Python script, you can use command-line arguments in Python. Below, we will outline the steps required to implement this solution.

Step 1: Modify the Python Script

You'll need to import the sys module in your Python script to access command-line arguments. Here's how you can modify your existing code:

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

By doing this, repeat and directory will now accept values that are passed from the bash script when it is executed.

Step 2: Update the Bash Script

Next, modify your bash script to pass the required arguments to your Python script. Here’s the updated version:

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

In this update, we've set repeat and directory to the values we want and then passed them as arguments in the line calling the Python script.

Benefits of This Approach

Increased Flexibility: You can easily change the values of repeat and directory directly in the bash script without altering the Python script.

Reusability: The same Python script can now be reused with different parameters based on the script being executed.

Dynamic Execution: You can automate tasks by changing parameters based on the conditions or requirements of your computational tasks.

Conclusion

By passing values from your bash script to a Python script using command-line arguments, you significantly improve your workflow in an HPC environment. With just a couple of modifications to your scripts, you can achieve a considerable degree of flexibility and reusability. Try implementing this in your own scripts and enjoy the increased efficiency it brings to your coding practices!

If you have any questions or need further assistance, don’t hesitate to reach out or drop a comment below!

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