Update requirements.txt to what's currently available in pip freeze

requirements.py

import os
import shutil
import subprocess
import time

with open('requirements.txt') as file:
    requirements = file.readlines()

tmp_name = f'requirements_{int(time.time())}.txt'
os.rename('requirements.txt', tmp_name)

with open('requirements.txt', 'a') as file:
    for requirement in requirements:
        file.write(
            subprocess.check_output(
                f'{shutil.which("python")} -m pip freeze | grep {requirement.strip().replace("_", "-")}',
                shell=True, stderr=subprocess.DEVNULL).decode()
        )

os.remove(tmp_name)