实用小程序：pip install

import logging
import subprocess

def pip_install(package=None, req=None, dest=None, src_dir=None):
    """
    pip安装命令
    :param package: pip包名称，或者wheel包名称
    :param dest: 安装目的位置
    :return: src_dir: 其他依赖包的来源
    """
    if package:
        cmd_list = [PYTHON_ENV, '-m', 'pip', 'install', package]
    elif req:
        cmd_list = [PYTHON_ENV, '-m', 'pip', 'install', '-r', req]
    else:
        return False

    if dest is not None:
        cmd_list.append('--target')
        cmd_list.append(dest)

    if src_dir is not None:
        cmd_list.append('--no-index')
        cmd_list.append(f'--find-links=./')

    try:
        # 如果已经安装了也不会报错
        out_bytes = subprocess.check_output(cmd_list)
        logging.info(out_bytes.decode())
        return True
    except subprocess.CalledProcessError as e:
        logging.error(f'install {package} failed, return={e.returncode}, error:{e.output}')
        return False