MIDDLEWARE = ['django.middleware.security.SecurityMiddleware','django.contrib.sessions.middleware.SessionMiddleware','django.middleware.common.CommonMiddleware','django.middleware.csrf.CsrfViewMiddleware','django.contrib.auth.middleware.AuthenticationMiddleware','django.contrib.messages.middleware.MessageMiddleware','django.middleware.clickjacking.XFrameOptionsMiddleware',
]

# Author:Jesi
# Time : 2018/10/19 12:33
class CORS(object):def process_response(self):print(666)

# Author:Jesi
# Time : 2018/10/19 12:48
path="auth.csrf.CORS"import importlib                                        #导入这个模块module_path,class_name=path.rsplit(".",maxsplit=1)      #通过右边的.分割开。print(module_path,class_name)     #auth.csrf     CORS
#根据字符串的形式导入模块
m=importlib.import_module(module_path)                  #然后根据这个方法可以导入模块cls = getattr(m,class_name)                            #通过getattr拿到这个类。
obj=cls()                                              #实例化对象
obj.process_response()                                 #执行打印666

def import_string(dotted_path):"""Import a dotted module path and return the attribute/class designated by thelast name in the path. Raise ImportError if the import failed."""try:module_path, class_name = dotted_path.rsplit('.', 1)except ValueError as err:raise ImportError("%s doesn't look like a module path" % dotted_path) from errmodule = import_module(module_path)try:return getattr(module, class_name)except AttributeError as err:raise ImportError('Module "%s" does not define a "%s" attribute/class' % (module_path, class_name)) from err