iSort changed files using git diff

isort_changed_files.py

import os
import sys
from subprocess import call, check_output

from isort import SortImports


def isort_all():
    path = sys.argv[1]
    abs_path = os.path.abspath(path)

    os.chdir(abs_path)
    file_list = check_output(['git', 'diff', '--name-only'])
    if type(file_list) is bytes:
        file_list = file_list.decode().strip().split('\n')
        for file_name in file_list:
            if file_name != '':
                print("Checking: {}".format(file_name))
                SortImports(file_name)
                print("="*80)
        print("DONE")
    else:
        return None


if __name__ == '__main__':
    if len(sys.argv) != 2:
        print('Usage: {} [path]'.format(sys.argv[0]))
    else:
        isort_all()