项目开发管理最佳实践之一 --定义异常类exceptions

项目开发中，经常遇到需要抛出异常情况，可以根据项目存在情况定一个异常类，项目以django ,rest_framework为例

 1 rom django.db.models.deletion import ProtectedError
 2 from rest_framework.exceptions import APIException
 3 from django.db.utils import IntegrityError
 4 from rest_framework import status
 5 '''
 6 定义抛出异常
 7 '''
 8 class AuthenticationFailed(APIException):
 9     status_code = status.HTTP_400_BAD_REQUEST
10     default_detail = '身份验证失败'
11     default_code = 'authentication_failed'
12 class NotAuthenticated(APIException):
13     status_code = status.HTTP_401_UNAUTHORIZED
14     default_detail = '未通过身份验证'
15     default_code = 'not_authenticated'
16
17 class ValidationError(APIException):
18     status_code = status.HTTP_400_BAD_REQUEST
19     default_detail = '无效请求'
20     default_code = 'invalid'
21
22 class ParseError(APIException):
23     status_code = status.HTTP_400_BAD_REQUEST
24     default_detail = '格式错误'
25     default_code = 'parse_error'
26
27 class PermissionDenied(APIException):
28     status_code = status.HTTP_403_FORBIDDEN
29     default_detail = '无权限执行操作.'
30     default_code = 'permission_denied'
31
32 class NotFound(APIException):
33     status_code = status.HTTP_404_NOT_FOUND
34     default_detail = '数据不存在'
35     default_code = 'not_found'
36
37 class ServerError(APIException):
38     status_code = status.HTTP_500_INTERNAL_SERVER_ERROR
39     default_detail = '服务器错误'
40     default_code = 'server_error'
41
42 __all__ = [
43         'ProtectedError', 'IntegrityError', 'AuthenticationFailed', 'NotAuthenticated','ValidationError', 'ParseError',
44         'PermissionDenied', 'NotFound', 'ServerError']