Add function to button in kivy file - kivy

Question

I am trying to bind my calculations function to the submit button. I am new to Kivy and trying to get in some practice. Any tips or tricks for learning are greatly appreciated. Here is my code:
Python File:
import kivy
from kivy.app import App
from kivy.uix.label import Label
from kivy.uix.gridlayout import GridLayout
from kivy.uix.textinput import TextInput
from kivy.uix.button import Button
from kivy.uix.widget import Widget
from kivy.properties import ObjectProperty
class MyGrid(Widget):
pass
class MyApp(App):
def build(self):
return MyGrid()
def calculations(self):
org_amount = float(self.ids.orgamount.text)
org_tip = int(self.ids.orgtip.text)
org_split = int(self.ids.split1.text)
tip1 = org_tip/100
tip = round(tip1 * org_amount, 2)
total = round(tip + org_amount, 2)
if org_split == 0:
split = org_split
else:
split = round(total/org_split,2)
if __name__ == "__main__":
MyApp().run()
KIVY FILE:
<MyGrid>:
title: 'tipBot v1.0'
auto_dismiss: False
GridLayout:
cols:2
size: root.width * 0.8, root.height * 0.8
row_default_height: 30
row_force_default: True
center: root.width/2, root.height/2
Label:
text: "Enter orginal bill amount: "
TextInput:
id: orgamount
hint_text: 'Enter number w/ 2 decimal places'
hint_text_color: 'blue'
multiline:False
Label:
text: "How much tip will you leave: "
TextInput:
id: orgtip
hint_text: 'Enter whole number'
hint_text_color: 'blue'
multiline:False
Label:
text: "How many patrons will split the bill: "
TextInput:
id: split1
multiline: False
Label:
text: "Orignal Bill Amount: "
TextInput:
id: amount
multiline: False
Label:
text: "Amount of tip: "
TextInput:
id: tip
multiline: False
Label:
text: "Total with tip: "
TextInput:
id: withtip
multiline: False
Label:
text:"Amount for each patron split: "
TextInput:
id:patronsplit
multiline: False
Button:
id: Clear
text: "Clear"
size_hint_x: 0
on_release:
orgamount.text = ''
orgtip.text = ''
split1.text = ''
amount.text = ''
tip.text = ''
withtip.text = ''
patronsplit.text =''
Button:
id: Submit
text: "Submit"
size_hint_x:0.5
on_press: root.calculations()
enter code here

Answer 1

The problem is that in your kv, the line:
on_press: root.calculations()
is trying to call the calculations() method of the root object of the kv rule, which is MyGrid. The fix is to just move the calculations() method into MyGrid:
class MyGrid(Widget):
def calculations(self):
org_amount = float(self.ids.orgamount.text)
org_tip = int(self.ids.orgtip.text)
org_split = int(self.ids.split1.text)
tip1 = org_tip / 100
tip = round(tip1 * org_amount, 2)
total = round(tip + org_amount, 2)
if org_split == 0:
split = org_split
else:
split = round(total / org_split, 2)
class MyApp(App):
def build(self):
return MyGrid()