django2/3 mysqlclient pymysql "Error loading MySQLdb module. Did you install mysqlclient?"

[davidkorea]

• installed mysqlclient pip install mysqlclient, error come out after set db in global settings.py

  File "/Users/yong/python-envs/dj3/lib/python3.7/site-packages/django/db/backends/mysql/base.py", line 21, in <module>) from err
django.core.exceptions.ImproperlyConfigured: Error loading MySQLdb module.
Did you install mysqlclient?

• installed pymysql python3 -m pip install PyMySQL, or just pip install pymysql
• add the code in the global/project __init__.py

# project __init__.py
import pymysql
pymysql.install_as_MySQLdb()

but still error come out with version

  File "/Users/yong/python-envs/dj3/lib/python3.7/site-packages/django/db/backends/mysql/base.py", line 37, in <module>
    raise ImproperlyConfigured('mysqlclient 1.3.13 or newer is required; you have %s.' % Database.__version__)
django.core.exceptions.ImproperlyConfigured: mysqlclient 1.3.13 or newer is required; you have 0.9.3.

then, go to python-envs/dj3/lib/python3.7/site-packages/django/db/backends/mysql/base.py", line 37 as the error showed out.

• comment the line37, and add pass below

if version < (1, 3, 13):
    # raise ImproperlyConfigured('mysqlclient 1.3.13 or newer is required; you have %s.' % Database.__version__)
    pass