def index():
    form = InputForm()
    if form.validate_on_submit():
        if 'convert_to_f' in request.form.keys():
            form.fahrenheit.data = c_to_f(float(form.celsius.data))
        else:
            form.celsius.data = f_to_c(float(form.fahrenheit.data))
    return render_template('index.html', form = form )
    def test_given1Returns33_8(self):
        f = c_to_f(1)

        self.assertEqual(f, 33.8)
    def test_given100Returns212(self):
        f = c_to_f(100)

        self.assertEqual(f, 212)
    def test_given0Returns(self):
        f = c_to_f(0)

        self.assertEqual(f, 32)