ModuleNotFoundError: No module named 'MySQLdb'

执行命令 python manage.py makemigrations时抛出以下错误

Traceback (most recent call last):
  File "D:\Program Files\Python\Python37-32\lib\site-packages\django\db\backends\mysql\base.py", line 15, in <module>
    import MySQLdb as Database
ModuleNotFoundError: No module named 'MySQLdb'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "manage.py", line 21, in <module>
    main()
  File "manage.py", line 17, in main
    execute_from_command_line(sys.argv)
  File "D:\Program Files\Python\Python37-32\lib\site-packages\django\core\management\__init__.py", line 371, in execute_from_command_line
    utility.execute()
  File "D:\Program Files\Python\Python37-32\lib\site-packages\django\core\management\__init__.py", line 347, in execute
    django.setup()
  File "D:\Program Files\Python\Python37-32\lib\site-packages\django\__init__.py", line 24, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "D:\Program Files\Python\Python37-32\lib\site-packages\django\apps\registry.py", line 112, in populate
    app_config.import_models()
  File "D:\Program Files\Python\Python37-32\lib\site-packages\django\apps\config.py", line 198, in import_models
    self.models_module = import_module(models_module_name)
  File "D:\Program Files\Python\Python37-32\lib\importlib\__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 728, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "D:\Program Files\Python\Python37-32\lib\site-packages\django\contrib\auth\models.py", line 2, in <module>
    from django.contrib.auth.base_user import AbstractBaseUser, BaseUserManager
  File "D:\Program Files\Python\Python37-32\lib\site-packages\django\contrib\auth\base_user.py", line 47, in <module>
    class AbstractBaseUser(models.Model):
  File "D:\Program Files\Python\Python37-32\lib\site-packages\django\db\models\base.py", line 114, in __new__
    new_class.add_to_class('_meta', Options(meta, app_label))
  File "D:\Program Files\Python\Python37-32\lib\site-packages\django\db\models\base.py", line 315, in add_to_class
    value.contribute_to_class(cls, name)
  File "D:\Program Files\Python\Python37-32\lib\site-packages\django\db\models\options.py", line 205, in contribute_to_class
    self.db_table = truncate_name(self.db_table, connection.ops.max_name_length())
  File "D:\Program Files\Python\Python37-32\lib\site-packages\django\db\__init__.py", line 33, in __getattr__
    return getattr(connections[DEFAULT_DB_ALIAS], item)
  File "D:\Program Files\Python\Python37-32\lib\site-packages\django\db\utils.py", line 202, in __getitem__
    backend = load_backend(db['ENGINE'])
  File "D:\Program Files\Python\Python37-32\lib\site-packages\django\db\utils.py", line 110, in load_backend
    return import_module('%s.base' % backend_name)
  File "D:\Program Files\Python\Python37-32\lib\importlib\__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "D:\Program Files\Python\Python37-32\lib\site-packages\django\db\backends\mysql\base.py", line 20, in <module>
    ) from err
django.core.exceptions.ImproperlyConfigured: Error loading MySQLdb module.
Did you install mysqlclient?

问题原因：MySQLdb只支持Python2.*，还不支持3.* ，但是在settings中配置的数据库为MySql，所以执行时会报错

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.mysql',
        'NAME': 'autotest',
        'USER': 'root',
        'PASSWORD': 'root',
        'HOST': '127.0.0.1',
        'PORT': '3306'

    }
}

 解决方法1：若想继续使用MySql数据库，则可用PyMySQL代替，安装命令为 pip install PyMySQL

在settings.py同级目录中的_init_.py文件中加入代码(只需更改此次，所创建的应用不需再设置，如果只在应用下的_init_.py文件中更改，则只适用该应用)

import pymysql

pymysql.install_as_MySQLdb()

再次执行：

D:\autotestplat>python manage.py makemigrations
Migrations for 'product':
  product\migrations\0001_initial.py
    - Create model Product
Migrations for 'apitest':
  apitest\migrations\0001_initial.py
    - Create model Apis
    - Create model Apistep
    - Create model Apitest
    - Add field Apitest to apistep
Migrations for 'bug':
  bug\migrations\0001_initial.py
    - Create model Bug

 解决方法2：安装mysqlclient,可用命令pip install mysqlclient