从 http://www.lfd.uci.edu/~gohlke/pythonlibs/#mysql-python

选择与您的python版本匹配的版本，例如mysqlclient‑1.4.2‑cp37‑cp37m‑win_amd64.whl，然后:

choose the version matching your python version, example mysqlclient‑1.4.2‑cp37‑cp37m‑win_amd64.whl, and then:

pip install wheel

pip install mysqlclient‑1.4.2‑cp37‑cp37m‑win_amd64.whl