query strings to pass numbers

 By default, all query string parameters are taken as strings.

To parse them as numbers, one option is to convert them using int() or float().

Another is to set the route methods to take them as numbers directly, i.e., to set data type to them in the route url.

from flask import Flask, render_template, request

app = Flask(__name__)

@app.route('/index')

@app.route('/')

def hello_flask():

    return 'Hello Flask'

@app.route('/new/')

def query_string(greeting='hello'):

    query_val = request.args.get('greeting', greeting)

    return '<h1> the greeting is: {0} </h1>'.format(query_val)

@app.route('/user')

@app.route('/user/<name>')

def no_query_strings(name='mina'):

    return '<h1> hello there ! {} </>'.format(name)

# strings

@app.route('/text/<string:name>')

def working_with_strings(name):

    return '<h1> here is a string: ' + name + '</h1>'

# numbers

@app.route('/numbers/<int:num>')

def working_with_numbers(num):

    return '<h1> the number you picked is: ' + str(num) + '</h1>'

# add numbers

@app.route('/add/<int:num1>/<int:num2>')

def adding_integers(num1, num2):

    return '<h1> the sum is : {}'.format(num1 + num2) + '</h1>'

# floats

@app.route('/product/<float:num1>/<float:num2>')

def product_two_numbers(num1, num2):

    return '<h1> the product is : {}'.format(num1 * num2) + '</h1>'