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How to flexibly use Python enumeration class to achieve design status code information, I believe that many inexperienced people do not know what to do, so this paper summarizes the causes of the problem and solutions, through this article I hope you can solve this problem.

In web projects, we often use custom status codes to inform the requestor of the request result and request status; how to design custom status code information in Python?

General class plus dictionary design status code #! / usr/bin/python3#-*-coding: utf-8-*-# @ Author: Hui# @ Desc: {Project response Code Module} # @ Date: 2021-09-22 23:37class RETCODE: OK = "0" ERROR = "- 1" IMAGECODEERR = "4001" THROTTLINGERR = "4002" NECESSARYPARAMERR = "4003" err_msg = {RETCODE.OK: "successful" RETCODE.IMAGECODEERR: "graphic CAPTCHA error", RETCODE.THROTTLINGERR: "access too frequently", RETCODE.NECESSARYPARAMERR: "missing required parameters",}

A separate dictionary is used to compare the status code information, so that once the design has more status codes, it is not easy to compare, and it is not so convenient to use it again. Simply try to organize a successful information.

Data = {'code': RETCODE.OK,' errmsg': err_ msg [RETCODE.OK]} skillfully using enumerated classes to design status code information

The status code information can be skillfully designed by using the enumeration class.

Definition of enumeration class #! / usr/bin/python3#-*-coding: utf-8-*-# @ Author: Hui# @ Desc: {Project enumeration class module} # @ Date: 2021-09-23 23:37from enum import Enumclass StatusCodeEnum (Enum): "status code enumeration class" OK = (0, 'success') ERROR = (- 1, 'error') SERVER_ERR = (500, 'server exception')

A normal class inherits the Enum class in the enum module and becomes an enumerated class.

The use of enumerated classes

Test and use in ipython

In [21]: ok = StatusCodeEnum.OKIn [22]: type (ok) Out [22]: In [23]: error = StatusCodeEnum.ERRORIn [24]: type (error) Out [24]: In [26]: ok.nameOut [26]: 'OK'In [27]: ok.valueOut [27]: (0,' success') In [28]: 'ERROR'In [29]: error.valueOut [29]: (- 1,' error')

Each property in the enumeration class returns an enumeration object, where the enumeration object has two important properties, name and value

Property names of name enumerated objects in enumerated classes

Value is the value of the enumeration object corresponding to the property name in the enumeration class.

# StatusCodeEnum.OK-> # name value# 'OK' (200,' success') # StatusCodeEnum.ERROR-> # name value# 'ERROR' (- 1,' error')

Organize a successful response message with enumerated class groups

Code = StatusCodeEnum.OK.value [0] errmsg = StatusCodeEnum.OK.value [1] data = {'code': code,' errmsg': errmsg}

At first glance, although the status code information is compared one by one, it is also very simple, but it is still a bit troublesome to use.

A grammar like StatusCodeEnum.OK.value [0] does not immediately know its meaning by name. Therefore, we also need to encapsulate the enumerated class.

Wrapper enumeration class #! / usr/bin/python3#-*-coding: utf-8-*-# @ Author: Hui# @ Desc: {Project enumeration class module} # @ Date: 2021-09-23 23:37from enum import Enumclass StatusCodeEnum (Enum): "" status code enumeration class "OK = (0, 'success') ERROR = (- 1, 'error') SERVER_ERR = 'server exception') @ property def code (self): "get status code"return self.value [0] @ property def errmsg (self):" get status code information "" return self.value [1]

Use the method of the type as a property through the @ property decorator, because the enumerated class. Attribute names correspond to different enumerated objects to encapsulate the status code and information. Look at the result of the external call

In [32]: StatusCodeEnum.OK.codeOut [32]: 0In [33]: StatusCodeEnum.OK.errmsgOut [33]: 'success' In [34]: StatusCodeEnum.ERROR.codeOut [34]:-1In [35]: StatusCodeEnum.ERROR.errmsgOut [35]: 'error'

For a detailed explanation of the use of @ property decorator, you can move to the skills of using property in Python

Continue to simulate organizational response data

Data = {'code': StatusCodeEnum.OK.code,' errmsg': StatusCodeEnum.OK.errmsg}

Now it's finally acceptable.

Status code information enumeration class

Share a wave of my usual status code information enumeration class for your reference.

#! / usr/bin/python3#-*-coding: utf-8-*-# @ Author: Hui# @ Desc: {Project enumeration class module} # @ Date: 2021-09-23 23:37from enum import Enumclass StatusCodeEnum (Enum): "" status code enumeration class "OK = (0, 'success') ERROR = (- 1, 'error') SERVER_ERR = (500) 'server exception') IMAGE_CODE_ERR = (4001, 'graphic CAPTCHA error') THROTTLING_ERR = (4002, 'access too frequently') NECESSARY_PARAM_ERR = (4003, 'missing required parameter') USER_ERR = (4004, 'wrong username') PWD_ERR = (4005, 'incorrect password') CPWD_ERR = (4006) 'inconsistent password') MOBILE_ERR = (4007, 'incorrect mobile number') SMS_CODE_ERR = (4008, 'incorrect SMS verification code') ALLOW_ERR = (4009, 'unchecked protocol') SESSION_ERR = (4010, 'user not logged in') DB_ERR = (5000, 'data error') EMAIL_ERR = (5001, 'incorrect mailbox') TEL_ERR = (5002) 'fixed phone error') NODATA_ERR = (5003,'no data') NEW_PWD_ERR = (5004, 'new password error') OPENID_ERR = (5005, 'invalid openid') PARAM_ERR = (5006,' parameter error') STOCK_ERR = (5007) 'insufficient inventory') @ property def code (self): "get status code"return self.value [0] @ property def errmsg (self):" get status code information "" return self.value [1]

After reading the above, have you mastered how to flexibly use the Python enumeration class to implement the design status code information? If you want to learn more skills or want to know more about it, you are welcome to follow the industry information channel, thank you for reading!

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