kivy Temp Converter - python-3.x

Question

I'm trying to create a Fahrenheit to Celsius program with Kivy. I keep getting
an error that compute is not defined. I am not sure why this is happening since it is being defined under . Any help would be greatly appreciated. Thanks for any help.
from kivy.app import App
from kivy.base import runTouchApp
from kivy.lang import Builder
from kivy.uix.gridlayout import GridLayout
runTouchApp(Builder.load_string('''
<Convert>:
id: compute
cols:2
padding: 10
spacing: 10
GridLayout:
cols:2
rows:3
Label:
text: 'Fahrenheit'
TextInput:
id: entry
multiline: False
Label:
text: 'Celsius'
TextInput:
id: result
multiline: False
Button:
text: 'Convert'
on_press: compute.celsius(result.text)
'''))
class Convert(GridLayout):
def Temp(self,celsius):
celsius = (entry-32) * 0.556
if celsius:
try:
self.result.text = str(eval(celsius))
except Exception:
self.result.txt = 'Error'
class ConverApp(App):
def build(self):
return Convert()
if __name__=='__main__':
ConverApp().run()

Answer 1

Your code has the following errors:
When you use compute.celsius() you are assuming that you have a celsius() method in your Convert class but you do not have it.
You must use the Temp() method without passing any arguments to it.
When using self.result you are assuming that result is a member of the Convert class but it is not. If you want to access an element within the hierarchy tree of the .kv you must do it through the id.
from kivy.app import App
from kivy.base import runTouchApp
from kivy.lang import Builder
from kivy.uix.gridlayout import GridLayout
runTouchApp(Builder.load_string('''
<Convert>:
id: compute
cols:2
padding: 10
spacing: 10
GridLayout:
cols:2
rows:3
Label:
text: 'Fahrenheit'
TextInput:
id: entry
multiline: False
Label:
text: 'Celsius'
TextInput:
id: result
multiline: False
Button:
text: 'Convert'
on_press: root.temp()
'''))
class Convert(GridLayout):
def temp(self):
try:
fahrenheit = self.ids.entry.text
celsius = (int(fahrenheit)-32) * 0.556
self.ids.result.text = str(celsius)
except ValueError:
self.ids.result.text = 'Error'
class ConverApp(App):
def build(self):
return Convert()
if __name__=='__main__':
ConverApp().run()