Django2.2报错-AttributeError: ''str'' object has no attribute ''decode'...

安装报错类型，解决方案；

1. 数据库链接报错

mysqldb只支持python2,pymysql支持3，都是使用c写的驱动，性能更好

# django中修改配置文件setting.py添加以下代码：

import pymysql
pymysql.install_as_MySQLdb()

解决方案： 修改数据库：mysqldb=>pymysql

2. 由于切换数据库致使版本错误

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.

解决方案： 注释掉检测数据库版本的代码

# "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/django/db/backends/mysql/base.py", line 36, in <module>
 
# if version < (1, 3, 13):
#     raise ImproperlyConfigured('mysqlclient 1.3.13 or newer is required; you have %s.' % Database.__version__)

3. 切换数据库致使转码错误

"/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/django/db/backends/mysql/operations.py", line 146, in last_executed_query
    query = query.decode(errors='replace')

解决方案： ==暂时使用第二种类型==

1. 修改decode为encode
2. 把条件注释掉，防止出现不可预知的错误，这个错误极可能是python2中类型str和unicode的缘由，python3中只有unicode类型数据

# "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/django/db/backends/mysql/operations.py", line 146

 # if query is not None:
      #query = query.encode(errors='replace')

解决完成以后完美运行