我如何才能找出当前提交及其父提交的作者？

git show --format='%an' HEAD

git show --format='%an' HEAD^

import subprocess

def get_commit_author(commit):
    command = f'git show --format="%an" {commit}'
    output = subprocess.check_output(command, shell=True)
    return output.decode().strip()

current_commit = 'HEAD'
parent_commit = 'HEAD^'

current_author = get_commit_author(current_commit)
parent_author = get_commit_author(parent_commit)

print(f'当前提交的作者：{current_author}')
print(f'父提交的作者：{parent_author}')