test_venv.py 文件源码

def test_prefixes(self):
        """
        Test that the prefix values are as expected.
        """
        #check our prefixes
        self.assertEqual(sys.base_prefix, sys.prefix)
        self.assertEqual(sys.base_exec_prefix, sys.exec_prefix)

        # check a venv's prefixes
        shutil.rmtree(self.env_dir)
        self.run_with_capture(venv.create, self.env_dir)
        envpy = os.path.join(self.env_dir, self.bindir, self.exe)
        cmd = [envpy, '-c', None]
        for prefix, expected in (
            ('prefix', self.env_dir),
            ('prefix', self.env_dir),
            ('base_prefix', sys.prefix),
            ('base_exec_prefix', sys.exec_prefix)):
            cmd[2] = 'import sys; print(sys.%s)' % prefix
            p = subprocess.Popen(cmd, stdout=subprocess.PIPE,
                                 stderr=subprocess.PIPE)
            out, err = p.communicate()
            self.assertEqual(out.strip(), expected.encode())