django2.0版本以上与pymsql 不匹配问题以及解决方法

django 2.0 以上 如果使用pymysql0.93,需要一下两步操作:
# 1 第一次报错信息:
   file "d:\virtualenv\wx\lib\site-packages\django\db\backends\mysql\base.py", line 36, 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.
  

#1.1 根据提示信息进入源码注销这两行，然后在运行
# if version < (1, 3, 13):
#     raise improperlyconfigured('mysqlclient 1.3.13 or newer is required; you have %s.' % database.__version__)


# 2 第二次报错处
file "d:\virtualenv\luffy\lib\site-packages\django\db\backends\mysql\operations.py", line 146, in last_executed_query
    query = query.decode(errors='replace')
attributeerror: 'str' object has no attribute 'decode'
# 2.2 在根据提示信息进入源码
# 在query = query.decode(errors='replace')解码这行上面，添加一行编码：
    # query = query.encode('utf8')