AGE CALCULATOR KIVY

 This is the source code for making an Age Calculator With Python Kivy.. Please if you like

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

screenmanager = """

ScreenManager:
    MainScreen:


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

    Label:
        text: 'Welcome to Age Calculator Kivy!' 
        pos_hint: {'center_x': 0.5, 'center_y':0.905}
        font_size: (self.height/15)* 0.75


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


    TextInput
        id: birthyear
        size_hint: 0.3, 0.05
        pos_hint:{'center_x':0.62, 'center_y': 0.705}
        text:root.profit

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


    TextInput
        id: currentyear
        size_hint: 0.3, 0.05
        pos_hint:{'center_x':0.62, '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() 

    



    Label: 
        text:'You are'    
        pos_hint:{'center_x':0.47, 'center_y': 0.355}  
        font_size: (self.height/15)* 0.65
        
    Label: 
        id: age
        text:str(root.finalage)    
        pos_hint:{'center_x':0.47, 'center_y': 0.255}  
        font_size: (self.height/15)* 0.65    

    Label: 
        text:'Years old!'    
        pos_hint:{'center_x':0.47, 'center_y': 0.155}  
        font_size: (self.height/15)* 0.65


"""


class Age(App):

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


class MainScreen(Screen):
    number = 0
    finalage = StringProperty(number)
    currentyear = date.today().year
    profit = StringProperty('0')
    loss = StringProperty(str(currentyear))

    def calculate(self):
        try:
            birth = self.ids.birthyear.text
            currentyear = self.ids.currentyear.text
            finalage = int(currentyear) - int(birth)
            self.ids.age.text = str(finalage)
            if finalage < 0:
                self.ids.age.text = str('Invalid')

        except ValueError:
            pass


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

Age().run()