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RuntimeError: Model class pyServerCode.appServerCode.models.ptTestOperatingEnvironment doesn't declare an explicit app_label and isn't in an application in INSTALLED_APPS.使用Django遇到这个问题：引入models的时候：提示appServerCode没有在INSTALLED_APPS中声明解决主要看两个地方①setting.

问题：新建django项目中，使用xxx.objects.filter没有代码提示import pymysqlimport logginglogger = logging.getLogger('log')from pyServerCode.appServer.models import ptTestDatabase（对应的models中添加objects = models.Manager()）def operate_DbSql(id,sql): try: databa.