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Python Flask how to get parameters from a URL?

Posted by: admin November 1, 2017 Leave a comment

Questions:

In Flask, How do I extract parameters from a URL?
How can I extract named parameters from a URL using flask and python?

When the user accesses this URL running on my flask app, I want the web service to be able to handle the parameters specified after the question mark:

http://10.1.1.1:5000/login?username=alex&password=pw1

#I just want to be able to manipulate the parameters
@app.route('/login', methods=['GET', 'POST'])
def login():
    username = request.form['username']
    print(username)
    password = request.form['password']
    print(password) 
Answers:

Use request.args to get parsed contents of query string:

from flask import request

@app.route(...)
def login():
    username = request.args.get('username')
    password = request.args.get('password')

Questions:
Answers:

The URL parameters are available in request.args, which is a MultiDict that has a get method, with optional parameters for default value (default) and type (type) – which is a callable that converts the input value to the desired format.

from flask import request

@app.route('/my-route')
def my_route():
  page = request.args.get('page', default = 1, type = int)
  filter = request.args.get('filter', default = '*', type = str)

Examples with the code above:

/my-route?page=34               -> page: 34  filter: '*'
/my-route                       -> page:  1  filter: '*'
/my-route?page=10&filter=test   -> page: 10  filter: 'test'
/my-route?page=10&filter=10     -> page: 10  filter: '10'
/my-route?page=*&filter=*       -> page:  1  filter: '*'