Flask URL building

url_for () function is to build a dynamic URL to a specific function is very useful. This function takes a name as a function of the first parameter takes one or more keywords and parameters, each parameter corresponding to the variable portion of the URL.

The following script demonstrates the use of url_for () function.

from flask import Flask, redirect, url_for
app = Flask(__name__)

@app.route('/admin')
def hello_admin():
   return 'Hello Admin'

@app.route('/guest/<guest>')
def hello_guest(guest):
   return 'Hello %s as Guest' % guest

@app.route('/user/<name>')
def hello_user(name):
   if name =='admin':
      return redirect(url_for('hello_admin'))
   else:
      return redirect(url_for('hello_guest',guest = name))

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

The above script has a function user (name) , which takes the parameter values from the URL.

The user () function checks the received parameters match "administrator" or not. If so, use the url_for () will be redirected to the application
hello_admin () function, otherwise the received parameters passed as a parameter to the guest hello_guest () function. **** ****

Save the above code and run from the Python shell.

Open a browser and enter the URL of - HTTP: // localhost: 5000 / the User / ADMIN

Application Browser in the response is -

Hello Admin

Enter the following URL in your browser - HTTP: // localhost: 5000 / the User / MVL

Application response now becomes -

Hello mvl as Guest

This switched: http: //codingdict.com/article/4868