Modify Exercise 10.4. Allow the user to select a temperature to be converted with a horizontal Scale. When the user interacts with the Scale, update the temperature conversion.

Question

What will be an ideal response?

Answer 1

```
# GUI that offers temperature conversion with a Scale.

from Tkinter import *

class TemperatureConversion( Frame ):
"""Temperature conversion of user input"""

def __init__( self ):
"""Create an Entry widget and a button"""

Frame.__init__( self )
self.grid( sticky = W+E+N+S )
self.master.title( "Converting Temperature" )
self.master.rowconfigure( 0, weight = 1 )
self.master.columnconfigure( 0, weight = 1 )

# create a descriptive label
self.description = Label( self, text =
"Enter Fahrenheit temperature" )
self.description.grid( row = 0, column = 0,
sticky = W+E )

# create an Entry widget for the temperature
self.temperature = Entry( self, width = 30,
name = "temperature" )
self.temperature.insert( INSERT,
self.FahrenheitToCelsius( 10.0 ) )
self.temperature.grid( row = 1, column = 0,
sticky = W+E )

# create Scale
self.control = Scale( self, from_ = -273, to = 212,
orient = HORIZONTAL, command = self.updateTemperature )
self.control.grid( row = 2, column = 0, sticky = W+E )
self.control.set( 10 )

def FahrenheitToCelsius( self, temperature ):
"""Convert from Fahrenheit to Celsius"""

# returns answer
return ( ( 5.0 / 9 ) * ( temperature - 32 ) )

def updateTemperature( self, scaleValue ):
"""Delete previous temperature, convert scale value
and display converted temperature"""

self.temperature.delete( 0, END )
converted = self.FahrenheitToCelsius( float( scaleValue ) )
self.temperature.insert( INSERT, converted )

def main():
TemperatureConversion().mainloop()

if __name__ == "__main__":
main()
```