python3.7安装email库出现报错 ?报错

下面是全部报错信息

Collecting email
  Downloading https://files.pythonhosted.org/packages/71/e7/816030d3b0426c130040bd068be62b9213357ed02896f5d9badcf46d1b5f/email-4.0.2.tar.gz (1.2MB)
     |████████████████████████████████| 1.2MB 11kB/s
    ERROR: Complete output from command python setup.py egg_info:
    ERROR: Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "d:\软件\python3.7.3\lib\site-packages\setuptools\__init__.py", line 18, in <module>
        import setuptools.version
      File "d:\软件\python3.7.3\lib\site-packages\setuptools\version.py", line 1, in <module>
        import pkg_resources
      File "d:\软件\python3.7.3\lib\site-packages\pkg_resources\__init__.py", line 36, in <module>
        import email.parser
      File "C:\Users\wenrui\AppData\Local\Temp\pip-install-zuekqdy0\email\email\parser.py", line 10, in <module>
        from cStringIO import StringIO
    ModuleNotFoundError: No module named 'cStringIO'
    ----------------------------------------
ERROR: Command "python setup.py egg_info" failed with error code 1 in C:\Users\wenrui\AppData\Local\Temp\pip-install-zuekqdy0\email\