Cross platform environment variable inspector (tested on macOS Sonoma 14.5 and python 3.12)

getenv.py

#!/usr/bin/env python
import psutil
import sys

if len(sys.argv) >= 2:
    pid = int(sys.argv[1])
else:
    import questionary

    answer = questionary.select(
        "Which process to inspect?",
        choices=[
            f'{proc.name()} | {proc.pid}' for proc in psutil.process_iter(["pid", "name"])
        ]).ask()  # returns value of selection
    pid = int(answer.split(" | ")[1])

proc = psutil.Process(pid)
env = proc.environ()

for key, value in env.items():
    print(f"{key}={value}")