1. Download the wheel file of lxml https://download.lfd.uci.edu/pythonlibs/t5yhk4lc/lxml-4.2.1-cp36-cp36m-win32.whl
Other versions can be downloaded here http://www.lfd.uci.edu/~gohlke/pythonlibs/#lxml
2. Installation command
pip3 install lxml‑4.2.1‑cp36‑cp36m‑win32.whl
3. Enter the python interface first under cmd, and then enter
from lxml import etree
If no error is reported, the installation is successful
