我只是想出了使用延迟导入实现它的另一种实际上更规范的方法，我最初的问题是试图在 函数中导入模型：
from logging import Handler
class DBHandler(Handler,object):
model_name = None
def __init__(self, model=""):
super(DBHandler,self).__init__()
self.model_name = model
def emit(self,record):
# instantiate the model
try:
model = self.get_model(self.model_name)
except:
from logger.models import GeneralLog as model
log_entry = model(level=record.levelname, message=self.format(record))
log_entry.save()
def get_model(self, name):
names = name.split('.')
mod = __import__('.'.join(names[:-1]), fromlist=names[-1:])
return getattr(mod, names[-1])
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