How to Automate User Input and Retrieve JSON Output from Python Scripts with subprocess?

Calling Python Scripts with User Input Using Subprocess

In Python, you may encounter a scenario where you want to execute a script (referred to as "a.py") that prompts the user for input and produces a JSON-formatted output. To automate the execution of this script from another script (named "b.py") using Python's subprocess module, follow these steps:

Import the necessary modules:

<code class="python">import os
import sys
from subprocess import check_output</code>

Determine the path to the script you want to execute ("a.py"):

<code class="python">script_path = os.path.join(get_script_dir(), 'a.py')</code>

Use the check_output() function to execute "a.py" and provide it with input:

<code class="python">output = check_output([sys.executable, script_path],
                      input='\n'.join(['query 1', 'query 2']),
                      universal_newlines=True)</code>

This command does the following:

• Provides "query 1" and "query 2" as input to the script.
• Executes the script using the Python interpreter specified by sys.executable.
• Captures the output of the script in the 'output' variable.

By providing input in this manner, you are effectively simulating user interaction with the script. The output can now be used as needed in your "b.py" script.

Additional Alternatives

• Import and Call Function: You can import the "a.py" module and call its functions directly, providing input and retrieving results.
• Use Multiprocessing: If query processing is CPU-intensive, consider using multiprocessing to run each query in a separate process for improved performance.

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