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How to do flask app routing in Python

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by vinitha@openweaver.com dot icon Updated: Oct 11, 2023

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Flask is a micro web framework. It is lightweight and flexible. It is popular for building web apps, RESTful Flask APIs, and other web services. 


It provides tools for handling HTTP requests and routing URLs to functions. To import Flask into a Python application, you need to follow these steps:  

  • Install and import Flask  
  • Create a Python Application  
  • Import Flask  
  • Create a Flask Application Instance  
  • Define Routes and Views  
  • Run the Application  


Flask app helps define URL routes and map URLs to specific app functions. Routing determines how we handle incoming HTTP requests. It determines which code we can execute to generate a response. It's a fundamental aspect of building dynamic web applications with Flask.  


Here are the steps to apply app routing in a Flask application:  

  • Import the Flask class at the beginning of your Python code script  
  • Create a Flask Application Instance  
  • Define Routes  
  • Run the Flask Application  
  • Start the Development Server  
  • Access Your Routes  


Jinja2 is a popular template engine for Python. It is commonly used in Flask web applications, including Flask app routing. The Jinja template lets you create dynamic HTML code. You can embed placeholders and control structures in the templates. These templates produce the final HTML or output sent to the client's web browser.  


In conclusion, Flask app routing is a fundamental component of web development. It enables developers to map URLs to specific functions within Flask applications. This routing system offers various features, from static to complex, dynamic routes.  

Fig: Preview of the output that you will get on running this code from your IDE

Code

In this solution we are using Flask python library

Multiple routing in flask- Python

PythondotLines of Code : 24dotLicense : Strong Copyleft (CC BY-SA 4.0)

Dependent Libraries : 
from flask import Flask, request

app = Flask(__name__)

@app.route('/test/contr/', endpoint='contr', methods=["POST", "GET"])
@app.route('/test/primary/', endpoint='primary', methods=["POST", "GET"])
def test():
    if request.endpoint == 'contr':
        msg = 'View function test() called from "contr" route'
    elif request.endpoint == 'primary':
        msg = 'View function test() called from "primary" route'
    else:
        msg = 'View function test() called unexpectedly'

    return msg

app.run()

@app.route('/test/contr/', default={'route': 'contr'}, methods=["POST", "GET"])
@app.route('/test/primary/', default={'route': 'primary'}, methods=["POST", "GET"])

def test(**kwargs):
    return 'View function test() called with route {}'.format(kwargs.get('route'))

Instructions

Follow the steps carefully to get the output easily.


  1. Download and Install the PyCharm Community Edition on your computer.
  2. Open the terminal and install the required libraries with the following commands.
  3. Create a new Python file on your IDE.
  4. Copy the snippet using the 'copy' button and paste it into your python file.
  5. Run the current file to generate the output.


I hope you found this useful.


I found this code snippet by searching for ' Multiple routing in flask- Python' in Kandi. You can try any such use case!

Environment tested

I tested this solution in the following versions. Be mindful of changes when working with other versions.

  1. PyCharm Community Edition 2023.1
  2. The solution is created in Python 3.11.1 Version
  3. Flask python current version



Using this solution, we can able to do flask app routing in Python with simple steps. This process also facilities an easy way to use, hassle-free method to create a hands-on working version of code which would help us to do flask app routing in Python.

Dependency library

flaskby pallets

Python doticonstar image 63300 doticonVersion:2.2.5doticon
License: Permissive (BSD-3-Clause)

The Python micro framework for building web applications.

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            flaskby pallets

            Python doticon star image 63300 doticonVersion:2.2.5doticon License: Permissive (BSD-3-Clause)

            The Python micro framework for building web applications.
            Support
              Quality
                Security
                  License
                    Reuse

                      You can search for any dependent library on kandi like ' flask'

                      FAQ:  

                      1. What is Flask, and how do you import it into a Python application?  

                      Flask is a micro web framework. It offers tools and libraries for building web applications, web services, and APIs. It is a great choice for developers who want to create web applications quickly. To import Flask into a Python application, follow these steps:  

                      • Install and import Flask  
                      • Create a Flask Application Instance  
                      • Define Routes and Views  
                      • Run the Flask Application  


                      2. How did you create your first Flask application?  

                      Creating your first Flask application is a straightforward process. Here are step-by-step instructions to help you get started:  

                      • Install Flask  
                      • Create a Project Directory  
                      • Create a Python File  
                      • Import Flask  
                      • Create a Flask Application Instance  
                      • Define a Route and View Function  
                      • Run the Flask Application  
                      • Start the Development Server  
                      • Access Your Flask Application  


                      3. How does one use dynamic web applications as part of flask app routing?  

                      Dynamic web applications are a key part of Flask app routing. It allows us to create interactive and data-driven websites. You can build web applications using dynamic routes, templates, and database integration. Here's a step-by-step guide: 

                      • Import Flask  
                      • Create a Flask Application Instance  
                      • Define Dynamic Routes  
                      • Create Templates  
                      • Render Templates  
                      • Database Integration and Forms and User Input  
                      • Authentication and Authorization  
                      • Testing and Deployment  

                        

                      4. How can we create dynamic URLs using Flask app routing?  

                      Here's how you can create dynamic URLs using Flask app routing:  

                      • Import Flask  
                      • Create a Flask Application Instance   
                      • Define Dynamic Routes  
                      • Accessing Route Parameters  
                      • Multiple Dynamic Parameters  
                      • Type Converters  
                      • Route Ordering  


                      5. Which HTTP methods do we support for URL routing with Flask apps?   

                      Flask supports a variety of HTTP methods for URL routing with Flask apps. HTTP methods determine the type of request made to a web server. Flask provides decorators with the ability to define routes for specific HTTP methods. Here are some of the HTTP methods supported for URL routing in Flask:   

                      • GET   
                      • POST  
                      • PUT  
                      • DELETE  
                      • PATCH  
                      • HEAD 

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