Change Directory in Python Subprocess

Here's how to change directory when shelling out to a process in python.

I'll show two methods. I want to run each process in the run_path, set to some valid path. This example is a process called pydeps, but it could be anything, os.getcwd(), what have you.

First: cwd

import subprocess

process = subprocess.Popen(f"pydeps --no-output --show-deps --max-bacon=0 .".split(), cwd=run_path, stdout=subprocess.PIPE)

Second: chdir

import os
import subprocess

process = subprocess.Popen(f"pydeps --no-output --show-deps --max-bacon=0 .".split(), stdout=subprocess.PIPE)
output, error = process.communicate()

Both should work, but depending on the command, output may differ. At least in my current circumstance it does, though I'm still unsure why.