如何使用python检查最新的git分支？

import subprocess

def get_latest_branch():
    # 切换到Git仓库所在的目录
    git_dir = '/path/to/your/git/repo'
    subprocess.call(['cd', git_dir])

    # 获取所有分支
    branches = subprocess.check_output(['git', 'branch', '-r']).decode().split('\n')

    # 过滤出远程分支
    remote_branches = [branch.strip() for branch in branches if 'origin/' in branch]

    # 获取最新的分支
    latest_branch = max(remote_branches, key=lambda branch: get_commit_date(branch))

    return latest_branch

def get_commit_date(branch):
    # 获取指定分支的最新提交日期
    commit_date = subprocess.check_output(['git', 'log', '-1', '--format=%cd', branch]).decode().strip()
    return commit_date

latest_branch = get_latest_branch()
print("最新的分支是：", latest_branch)