烧瓶中的 Http PUT 方法在断言中失败答案

【问题标题】：Http PUT method in flask is failing in assertion烧瓶中的 Http PUT 方法在断言中失败
【发布时间】：2026-02-11 03:45:01
【问题描述】：

嗨，健康的程序员，

我最近参加了很多实践活动。我一直在学习 Flask 编程并尝试在在线编程平台和挑战中找到的各种示例。我被困在一个解决方案中，其中我能够清除 7 个测试用例，而一个已经失败了很长时间。在我编写的这个解决方案之外，我无法查看或下定决心。

请有人能帮助我破解这个 PUT http 测试用例。我已经附上了测试用例以及我的源代码。

blogs_app.py

from flask import Flask, request
from flask_restful import Resource, Api, abort

app = Flask(__name__)
api = Api(app)


blogs = {}

class BlogsAPI(Resource):
    def get(self, blog_id=None):
      if blog_id is None:
            return blogs
      if blog_id not in blogs:
          abort(404,message="Blog_Id {} doesn't exist".format(blog_id))
      return blogs[blog_id]

def post(self, blog_id):
  if blog_id not in blogs:
        title = request.form['title']
        article_text = request.form['article_text']
        created_at = '%Y-%m-%d %H:%M:%S'
        blogs[blog_id] = {'title': title, 'article_text':article_text, 'created_at':created_at}
        return {blog_id: blogs[blog_id]}
  abort(404, message='Blog_Id {} already exists'.format(blog_id))

def put(self, blog_id):
  if blog_id not in blogs:
    abort(404,message="Blog_Id {} doesn't exist".format(blog_id))
  blogs[blog_id] = request.form['title']
  return {blog_id: blogs[blog_id]}

def delete(self, blog_id):
  if blog_id in blogs:
    response_string = 'Blog with Id {} is deleted'.format(blog_id)
    del blogs[blog_id]
    return response_string
  abort(404, message="Blog_Id {} doesn't exist".format(blog_id))

api.add_resource(BlogsAPI, '/blogs/',
                              '/blogs/<int:blog_id>/')

if __name__ == '__main__':
    app.run()

这是提供的测试用例文件。

test_app.py

from blogs_app import app
import unittest
from urllib import request
import datetime

class TestBlogsAPI(unittest.TestCase):
    def setUp(self):
        self.client = app.test_client()

    def test_blogs_api_case1(self):
        blog = {'title' : 'Python Application Programming',
                'article_text': 'This article talks about Python and illustrates how Python is used in application programming, with examples.',
                }
        response = self.client.post('/blogs/1/', data=blog)
        self.assertIn(b'"title": "Python Application Programming"', response.data)
        self.assertIn(b'"article_text": "This article talks about Python and illustrates how Python is used in application programming, with examples."', response.data)
        
        
    def test_blogs_api_case2(self):
        blog = {'title' : 'Flask - A Micro Web Framework in Python',
                'article_text': 'This article talks about Flask framework. It can be used to build web apps in a quick time.',
                }
        response = self.client.post('/blogs/2/', data=blog)
        self.assertIn(b'"title": "Flask - A Micro Web Framework in Python"', response.data)
        self.assertIn(b'"article_text": "This article talks about Flask framework. It can be used to build web apps in a quick time."', response.data)
        
    def test_blogs_api_case3(self):
        blog = {'title' : 'Flask-RESTful - Flask Extension for building REST APIs',
                'article_text': 'This article introduces you to Flask-RESTful, an extension used for building REST APIs in Flask.',
                }
        response = self.client.post('/blogs/3/', data=blog)
        self.assertIn(b'"title": "Flask-RESTful - Flask Extension for building REST APIs"', response.data)
        self.assertIn(b'"article_text": "This article introduces you to Flask-RESTful, an extension used for building REST APIs in Flask."', response.data)
        
    def test_blogs_api_case4(self):
        response = self.client.get('/blogs/')
        self.assertIn(b'"title": "Python Application Programming"', response.data)
        self.assertIn(b'"article_text": "This article talks about Python and illustrates how Python is used in application programming, with examples."', response.data)
        self.assertIn(b'"title": "Flask - A Micro Web Framework in Python"', response.data)
        self.assertIn(b'"article_text": "This article talks about Flask framework. It can be used to build web apps in a quick time."', response.data)
        self.assertIn(b'"title": "Flask-RESTful - Flask Extension for building REST APIs"', response.data)
        self.assertIn(b'"article_text": "This article introduces you to Flask-RESTful, an extension used for building REST APIs in Flask."', response.data)
        
    def test_blogs_api_case5(self):
        response = self.client.get('/blogs/3/')
        self.assertNotIn(b'"title": "Python Application Programming"', response.data)
        self.assertNotIn(b'"article_text": "This article talks about Python and illustrates how Python is used in application programming, with examples."', response.data)
        self.assertNotIn(b'"title": "Flask - A Micro Web Framework in Python"', response.data)
        self.assertNotIn(b'"article_text": "This article talks about Flask framework. It can be used to build web apps in a quick time."', response.data)
        self.assertIn(b'"title": "Flask-RESTful - Flask Extension for building REST APIs"', response.data)
        self.assertIn(b'"article_text": "This article introduces you to Flask-RESTful, an extension used for building REST APIs in Flask."', response.data)
    
        
    def test_blogs_api_case5(self):
        response = self.client.delete('/blogs/3/')
        self.assertIn(b'Blog with Id 3 is deleted', response.data)
        response = self.client.get('/blogs/')
        self.assertIn(b'"title": "Python Application Programming"', response.data)
        self.assertIn(b'"article_text": "This article talks about Python and illustrates how Python is used in application programming, with examples."', response.data)
        self.assertIn(b'"title": "Flask - A Micro Web Framework in Python"', response.data)
        self.assertIn(b'"article_text": "This article talks about Flask framework. It can be used to build web apps in a quick time."', response.data)
        self.assertNotIn(b'"title": "Flask-RESTful - Flask Extension for building REST APIs"', response.data)
        self.assertNotIn(b'"article_text": "This article introduces you to Flask-RESTful, an extension used for building REST APIs in Flask."', response.data)
        
    def test_blogs_api_case6(self):
        response = self.client.delete('/blogs/6/')
        self.assertIn(b"Blog_Id 6 doesn't exist", response.data)
        
    def test_blogs_api_case7(self):
        blog = {'title' : 'PYTHON APPLICATION PROGRAMMING',
                }
        response = self.client.put('/blogs/7/', data=blog)

        self.assertIn(b"Blog_Id 7 doesn't exist", response.data)
        
    def test_blogs_api_case8(self):
        blog = {'title' : 'PYTHON APPLICATION PROGRAMMING'}
        response = self.client.put('/blogs/1/', data=blog)
        
        self.assertIn(b'"title": "PYTHON APPLICATION PROGRAMMING"', response.data)
        self.assertIn(b'"article_text": "This article talks about Python and illustrates how Python is used in application programming, with examples."', response.data)

我在运行时收到以下错误消息，并且第 8 个测试用例失败:(

test_blogs_api_case1 (test_app.TestBlogsAPI) ... ok
test_blogs_api_case2 (test_app.TestBlogsAPI) ... ok
test_blogs_api_case3 (test_app.TestBlogsAPI) ... ok
test_blogs_api_case4 (test_app.TestBlogsAPI) ... ok
test_blogs_api_case5 (test_app.TestBlogsAPI) ... ok
test_blogs_api_case6 (test_app.TestBlogsAPI) ... ok
test_blogs_api_case7 (test_app.TestBlogsAPI) ... ok
test_blogs_api_case8 (test_app.TestBlogsAPI) ... FAIL

======================================================================
FAIL: test_blogs_api_case8 (test_app.TestBlogsAPI)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/projects/challenge/test_app.py", line 81, in test_blogs_api_case8
    self.assertIn(b'"article_text": "This article talks about Python and illustrates how Python is used in application programming, with examples."', response.data)
AssertionError: b'"article_text": "This article talks about Python and illustrates how Python is used in application programming, with examples."' not found in b'{"1": {"title": "PYTHON APPLICATION PROGRAMMING"}}\n'

----------------------------------------------------------------------
Ran 8 tests in 0.022s

FAILED (failures=1)

【问题讨论】：

你能告诉我们response.data是什么吗？
@waqasgard 响应数据是字典对象“Blogs”的形式例如：b'{"Python Application Programming": "This article talks about Python and illustrates how Python is used in application programming, with examples."}\n'
您能否确认响应确实包含您要断言的内容？
@waqasgard: 是的，我确认它可用.. b'{"PYTHON APPLICATION PROGRAMMING": "本文讨论了 Python，并通过示例说明了 Python 在应用程序编程中的使用方式。"}\n ' 不确定为什么即使响应正确，PUT 方法也没有被断言。

标签： python python-3.x list rest flask

【解决方案1】：

def put(self, blog_id):
  if blog_id not in blogs:
    abort(404,message="Blog_Id {} doesn't exist".format(blog_id))
  **blogs[blog_id]['title'] = request.form['title']**
  return {blog_id: blogs[blog_id]}

改变put方法

【讨论】：

【解决方案2】：

试试这个。

def put(self, blog_id):
        if blog_id not in blogs:
            abort(404, message="Blog_Id {} doesn't exist".format(blog_id))
        blogs[blog_id]['title'] = request.form['title']
        return blogs[blog_id]

【讨论】：

【解决方案3】：

主要问题是更新的“密钥”不是这个问题给定，所以我们必须首先检查测试用例，根据测试用例更新的键是“标题”，所以我们必须使用更新这个键值一个 HTTP 请求。

def put(self, blog_id):
     if blog_id not in blogs:
        abort(404,message="Blog_Id {} doesn't exist".format(blog_id))
     blogs[blog_id]['title'] = request.form['title']
     return {blog_id: blogs[blog_id]}

【讨论】：