werkzeug.routing.BuildError:无法为端点建立网址 [英] werkzeug.routing.BuildError: Could not build url for endpoint
问题描述
我创建了一个Web API来呈现带有导航的网页.下面是我的代码
I have created a web API to render a webpage with navigation. Below is my code
from flask import Flask, render_template, request
app = Flask(__name__)
@app.route('/testsite/')
def home():
return render_template('home.html')
if __name__ == '__main__':
app.run(debug=True)
@app.route('/about/')
def about():
return render_template('about.html')
if __name__ == '__main__':
app.run(debug=True)
下面是两个html模板的HTML代码
Below is the HTML code for both html templates
home.html
<!DOCTYPE html>
<html>
<body>
{% extends "layout.html" %}
{% block content %}
<div class="home">
<h1>My Personal Website</h1>
<p>Hi, this is my personal website.</p>
</div>
{% endblock %}
</body>
</html>
about.html
<!DOCTYPE html>
<html>
<body>
{% extends "layout.html" %}
{% block content %}
<div class="about">
<h1>About me</h1>
<img src="{{ user_image }}" alt="User Image">
<p>Update about yourself here</p>
</div>
{% endblock %}
现在，此示例可以正常运行.但是当我尝试使用它来添加代码以使API成为机器学习模式时.
Now this example works perfectly fine. But when I try to use this to add code to make API for a machine learning mode.
下面是相同的代码.
from flask import Flask, abort, request,render_template, json, render_template_string
from DataPreparationv4 import Data_Preprocess
import numpy as np
import pandas as pd
import pickle
from flask_jsonpify import jsonpify
pd.options.mode.chained_assignment = None
filename = 'CTA_Classification.pkl'
loaded_model = pickle.load(open(filename, 'rb'))
app = Flask(__name__)
@app.route("/", methods=['GET'])
def Predictions():
Base_Data = pd.read_csv('Test.csv')
DataSet1 = Data_Preprocess(Base_Data)
[...]
df_list = Predictions.values.tolist()
return render_template('homev2.html', my_list=df_list)
if __name__ == '__main__':
app.run(debug = True)
@app.route('/about/')
def about():
return render_template('about.html')
if __name__ == '__main__':
app.run(debug = True)
现在，当我运行此命令时，出现以下错误.我什至尝试将返回代码更改为 return render_template('homev2.html')，但存在相同的错误.
Now, when I run this, I get the below error. I have even tried to change the return code to return render_template('homev2.html') but with same error.
werkzeug.routing.BuildError:无法为端点"home"建立URL.您是说关于"吗?
werkzeug.routing.BuildError: Could not build url for endpoint 'home'. Did you mean 'about' instead?
以下是home.html的代码修订代码，名为 homev2.html :
Below is the code revised code for home.html named as homev2.html:
<!DOCTYPE html>
<html>
<body>
{% extends "layout.html" %}
{% block content %}
<div class="home">
<h1>Predictions Page</h1>
<p><h4>Predictions</h4></p>
<table>
<tbody>
{# here we iterate over every item in our list#}
{% for item in my_list %}
<tr><td>{{ item }}</td></tr>
{% endfor %}
</tbody>
</table>
</div>
{% endblock %}
</body>
</html>
layout.html
<!DOCTYPE html>
<html>
<head>
<title>Flask app</title>
<link rel="stylesheet" href="{{ url_for('static', filename='css/main.css') }}">
</head>
<body>
<header>
<div class="container">
<h1 class="logo">The web app</h1>
<strong><nav>
<ul class="menu">
<li><a href="{{ url_for('home') }}">Home</a></li>
<li><a href="{{ url_for('about') }}">About</a></li>
</ul>
</nav></strong>
</div>
</header>
<div class="container">
{% block content %}
{% endblock %}
</div>
</body>
</html>
下面是完整的追溯
[2018-07-08 23:05:35,225] ERROR in app: Exception on / [GET]
Traceback (most recent call last):
File "C:\Users\sudhir_kb\Continuum\anaconda3\lib\site-packages\flask\app.py", line 2292, in wsgi_app
response = self.full_dispatch_request()
File "C:\Users\sudhir_kb\Continuum\anaconda3\lib\site-packages\flask\app.py", line 1815, in full_dispatch_request
rv = self.handle_user_exception(e)
File "C:\Users\sudhir_kb\Continuum\anaconda3\lib\site-packages\flask\app.py", line 1718, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "C:\Users\sudhir_kb\Continuum\anaconda3\lib\site-packages\flask\_compat.py", line 35, in reraise
raise value
File "C:\Users\sudhir_kb\Continuum\anaconda3\lib\site-packages\flask\app.py", line 1813, in full_dispatch_request
rv = self.dispatch_request()
File "C:\Users\sudhir_kb\Continuum\anaconda3\lib\site-packages\flask\app.py", line 1799, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "D:\Deploy\Predictions.py", line 51, in Predictions
return render_template('homev2.html', my_list=df_list)
File "C:\Users\sudhir_kb\Continuum\anaconda3\lib\site-packages\flask\templating.py", line 135, in render_template
context, ctx.app)
File "C:\Users\sudhir_kb\Continuum\anaconda3\lib\site-packages\flask\templating.py", line 117, in _render
rv = template.render(context)
File "C:\Users\sudhir_kb\Continuum\anaconda3\lib\site-packages\jinja2\asyncsupport.py", line 76, in render
return original_render(self, *args, **kwargs)
File "C:\Users\sudhir_kb\Continuum\anaconda3\lib\site-packages\jinja2\environment.py", line 1008, in render
return self.environment.handle_exception(exc_info, True)
File "C:\Users\sudhir_kb\Continuum\anaconda3\lib\site-packages\jinja2\environment.py", line 780, in handle_exception
reraise(exc_type, exc_value, tb)
File "C:\Users\sudhir_kb\Continuum\anaconda3\lib\site-packages\jinja2\_compat.py", line 37, in reraise
raise value.with_traceback(tb)
File "D:\Deploy\templates\homev2.html", line 4, in top-level template code
{% extends "layout.html" %}
File "D:\Deploy\templates\layout.html", line 13, in top-level template code
<li><a href="{{ url_for('home') }}">Home</a></li>
File "C:\Users\sudhir_kb\Continuum\anaconda3\lib\site-packages\flask\helpers.py", line 356, in url_for
return appctx.app.handle_url_build_error(error, endpoint, values)
File "C:\Users\sudhir_kb\Continuum\anaconda3\lib\site-packages\flask\app.py", line 2061, in handle_url_build_error
reraise(exc_type, exc_value, tb)
File "C:\Users\sudhir_kb\Continuum\anaconda3\lib\site-packages\flask\_compat.py", line 35, in reraise
raise value
File "C:\Users\sudhir_kb\Continuum\anaconda3\lib\site-packages\flask\helpers.py", line 345, in url_for
force_external=external)
File "C:\Users\sudhir_kb\Continuum\anaconda3\lib\site-packages\werkzeug\routing.py", line 1776, in build
raise BuildError(endpoint, values, method, self)
werkzeug.routing.BuildError: Could not build url for endpoint 'home'. Did you mean 'about' instead?
127.0.0.1 - - [08/Jul/2018 23:05:35] "[1m[35mGET / HTTP/1.1[0m" 500 -
我不明白为什么在添加代码以显示预测时出现错误，因为那只是变化.我要去哪里错了.
I don't understand why I am getting an error when I add the code to display the predictions as that's is only change. Where am I going wrong.
我仍然是新手，正在通过互联网研究来学习这些概念.
I am still a newbie and learning these concepts by researching in internet.
我搜索并没有找到类似的问题，尽管许多帖子中的错误相同，因此创建了此问题.如果这是重复的邮件，请引导我转到原始帖子.
I have searched and did not find a similar issue even though the error is same in many posts hence created this. If this is a duplicate, please guide me to the original post.
请帮助我解决此问题.
推荐答案
删除第一个 if __name __ 语句后，错误仍然存在，因为您在其中调用了视图 home 您的模板 layout.html :
After removing the first if __name__ statement, the error persists because you are calling the view home in your template layout.html :
File "D:\Deploy\templates\layout.html", line 13, in top-level template code
<li><a href="{{ url_for('home') }}">Home</a></li>
因此 url_for 试图找到一个名为 home 的视图，但是您将其替换为视图 Predictions :
so url_for tries to find a view called home but you replaced it with the view Predictions :
@app.route("/", methods=['GET'])
def Predictions():
...
因此您可以将此函数的名称更改为 home 或将模板中的调用更改为
So you can change the name of this function to home or change the call in your template to
<li><a href="{{ url_for('Predictions') }}">Home</a></li>
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