[Tkinter] How to perform math function in different page of Tkinter GUI

[deanhystad]

Another way to make a much more powerful calculator with much less code is using "eval". The code below has evaluates the equation and displays the result when the user types "=".

from tkinter import *
from math import *

root = Tk()

def evaluate(*args):
    try:
        equ = equation.get()
        if equ[-1] == '=':
            result.set(str(eval(equ[:-1])))
        else:
            result.set('')
    except:
        result.set('')
    
equation = StringVar()
equation.trace('w', evaluate)
result = StringVar()   
 
x = Label(root, text='Equation ')
x.grid(row=0, column=0)
 
x = Entry(root, textvar=equation, width=30)
x.grid(row=0, column=1)
  
x = Entry(root, textvar=result, width=8, justify=RIGHT, state="readonly")
x.grid(row=0, column=2)
 
root.mainloop()

To calculate the hypotenuse of a right triangle enter "(3**2 + 4**2)**0.5="