PROFIT AND LOSS CALCULATOR PYTHON KIVY

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from kivy.app import App
from kivy.properties import StringProperty
from kivy.lang.builder import Builder
from kivy.uix.screenmanager import Screen, ScreenManager

screenmanager = """

ScreenManager:
    MainScreen:


<MainScreen>:
    name: 'main'
    RelativeLayout:
        orientation: 'vertical'
        pos: self.pos

    Label:
        text: 'Welcome to profit and loss calculator!' 
        pos_hint: {'center_x': 0.5, 'center_y':0.905}
        font_size: (self.height/15)* 0.75


    Label: 
        text:'Enter Total Profit!'    
        pos_hint:{'center_x':0.3, 'center_y': 0.705}  
        font_size: (self.height/15)* 0.65


    TextInput
        id: profit
        size_hint: 0.3, 0.05
        pos_hint:{'center_x':0.6, 'center_y': 0.705}
        text:root.profit

    Label: 
        text:'Enter Total Loss!'    
        pos_hint:{'center_x':0.3, 'center_y': 0.605}  
        font_size: (self.height/15)* 0.65


    TextInput
        id: loss
        size_hint: 0.3, 0.05
        pos_hint:{'center_x':0.6, 'center_y': 0.605}  
        text: root.loss 


    Button:
        text: 'calculate'
        size_hint: .3, .1
        pos_hint:{'center_x':0.47, 'center_y': 0.505} 
        on_press: root.calculate() 

    TextInput:
        text: '0'
        id: answer
        pos_hint:{'center_x':0.47, 'center_y': 0.305}
        size_hint: 0.3, 0.15   








"""


class Pal(App):

    def build(self):
        screen = Builder.load_string(screenmanager)
        return screen


class MainScreen(Screen):
    profit = StringProperty('0')
    loss = StringProperty('0')

    def calculate(self):
        try:
            profitvariable = self.ids.profit.text
            lossvariable = self.ids.loss.text
            answer = 0
            answer = int(profitvariable) - int(lossvariable)
            print(answer)

            if answer > 0:
                answer = self.ids.answer.text = str(answer) + str(' Profit')

            elif answer == 0:
                answer = self.ids.answer.text = str(answer)

            else:
                answer = self.ids.answer.text = str(answer) + str(' Loss')
        except ValueError:
            answer = self.ids.answer.text = str('Invalid Value!')


sm = ScreenManager()
sm.add_widget(MainScreen(name='main'))

Pal().run()