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) 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 %} Now this example works perfectly fine. But when I try to use this to add code to make API for a machine learning mode.
Below is the code the for the same.
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) 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: Could not build url for endpoint 'home'. Did you mean 'about' instead?
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> Below is the full traceback
[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 - 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.
I am still a newbie and learning these concepts by researching in internet.
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.
Please help me in fixing this issue.