Как вводить числа в Питоне?

sim3x, python 2.7

#!/usr/bin/env python
# -*- coding: utf-8 -*-
from flask import Flask, render_template, request

app = Flask(__name__)
app.config.from_object(__name__)


@app.route('/')
def welcome():
    return render_template('form.html')


@app.route('/result', methods=['POST'])
def result():
    var_1 = request.form.get("var_1", type=int)
    var_2 = request.form.get("var_2", type=int)
    var_3 = request.form.get("var_3", type=int)
    var_4 = request.form.get("var_4", type=int)
    var_5 = request.form.get("var_5", type=int)
    var_6 = request.form.get("var_6", type=int)


    operation = request.form.get("operation")
    operation2 = request.form.get("operation2")
    operation3 = request.form.get("operation3")
    operation4 = request.form.get("operation4")
    operation5 = request.form.get("operation5")
    operation6 = request.form.get("operation6")
    operation7 = request.form.get("operation7")

    if(operation == u'Q (теплота в Дж)' and operation2 == u"q (Электрический заряд в Кл)" and operation3 == u"C (емкость в фарад)"):
        result = var_1**2 / 2*var_2