upgrade_requirements.py 文件源码

 复制代码def make_virtualenv(args):
    with cleanup_dir(tempfile.mkdtemp()) as tempdir:
        venv, python, pip = dirs(tempdir)
        print_call(
            sys.executable, '-m', 'virtualenv', venv,
            '-p', args.python, '--never-download',
        )

        def pip_install(*argv):
            print_call(pip, 'install', '-i', args.index_url, *argv)

        # Latest pip installs python3.5 wheels
        pip_install('pip', 'setuptools', '--upgrade')
        pip_install('-r', 'requirements-minimal.txt')
        pip_install('-r', 'requirements-dev-minimal.txt')

        reexec(
            python, __file__.rstrip('c'),
            '--tempdir', tempdir,
            # Pass along existing args
            '--index-url', args.index_url,
            '--exec-count', str(args.exec_count),
            '--exec-limit', str(args.exec_limit),
            reason='to use the virtualenv python',
        )