C:\Users\111>pip -V
pip 19.1.1 from D:\Python37\lib\site-packages\pip-19.1.1-py3.7.egg\pip (python 3.7)
C:\Users\111>pip install email
Collecting email
Using cached https://files.pythonhosted.org/packages/71/e7/816030d3b0426c130040bd068be62b9213357ed02896f5d9badcf46d1b5f/email-4.0.2.tar.gz
ERROR: Complete output from command python setup.py egg_info:
ERROR: Traceback (most recent call last):
File "<string>", line 1, in <module>
File "D:\Python37\lib\site-packages\setuptools\__init__.py", line 12, in <module>
import setuptools.version
File "D:\Python37\lib\site-packages\setuptools\version.py", line 1, in <module>
import pkg_resources
File "D:\Python37\lib\site-packages\pkg_resources\__init__.py", line 36, in <module>
import email.parser
File "C:\Users\111\AppData\Local\Temp\pip-install-i6c6xiar\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\111\AppData\Local\Temp\pip-install-i6c6xiar\email\