python自动使用虚拟环境和安装依赖

代码如下，Windows环境测试通过

import os
import platform
import re
import sys
from pathlib import Path


def is_venv() -> bool:
    """判断是否处于虚拟环境(也适用于poetry的)"""
    if hasattr(sys, "real_prefix"):
        return True
    return hasattr(sys, "base_prefix") and sys.base_prefix != sys.prefix


def run_and_echo(cmd) -> int:
    print("-->\n", cmd, flush=True)
    return os.system(cmd)


def install_and_rerun(*packages):
    py = Path(sys.executable)
    if not is_venv():
        if not (p := Path("venv")).exists():
            if run_and_echo(f"{py} -m venv venv"):
                return 1
        if platform.platform().lower().startswith("win"):
            py = p / "Scripts" / "python.exe"
        else:
            py = p / "bin/python"
    if run_and_echo(f"{py} -m pip install {' '.join(packages)}"):
        return 2
    cmd = f"{py} {sys.argv[0]} --no-install {' '.join(sys.argv[1:])}"
    return run_and_echo(cmd)


try:
    import kivy
except ImportError as e:
    if "--no-install" in sys.argv:
        raise e
    modules = re.findall(r"'([a-zA-Z_-]+)'", str(e))
    sys.exit(install_and_rerun(*modules))


def main():
    pass

if __name__ == '__main__':
    main()　

运行时，如果import失败，会判断是否处于虚拟环境，是的话，直接pip install报错的缺失包，然后自动重新执行脚本;

否则，判断当前路径是否有venv文件，有的话使用venv/*/python，否则使用python -m venv venv创建它