packaging.py 文件源码

def _pip_install(links, requires, root=None, option_dict=dict()):
    if options.get_boolean_option(
            option_dict, 'skip_pip_install', 'SKIP_PIP_INSTALL'):
        return
    cmd = [sys.executable, '-m', 'pip.__init__', 'install']
    if root:
        cmd.append("--root=%s" % root)
    for link in links:
        cmd.append("-f")
        cmd.append(link)

    # NOTE(ociuhandu): popen on Windows does not accept unicode strings
    git._run_shell_command(
        cmd + requires,
        throw_on_error=True, buffer=False, env=dict(PIP_USE_WHEEL=b"true"))