Python Tkinter Entry() Calculations

Question

I am currently trying to build a GUI calculator using python with the help of tkinter. I have managed to set up all of my buttons and they interact with my entry() bar when I press the button (e,g: Press button 5 and 5 appears into the entry()).

The only thing left to do is actually perform the mathematical equations that appear in the entry(). For example, if I enter 5 + 5 * 2 into the entry bar, how would I make the answer appear into the entry() after it's updated? So basically all I'm asking is someone to help me make this happen!

I have provided the code below and a screenshot of the calculator. Also please don't report this as a duplicate or flag this question as a post, (I'm reasking this question because I got no help on my last one so please help a young python programmer out!). Also I'm asking you not to provide me with links because I've read every possible link on tkinter there is to read and still have no clue what I'm doing.

Here is my code:

import sys
from tkinter import *
from PIL import Image, ImageTk

#ACTIONS:
def clear():
    #Action: Clears the entry().
    txtDisplay.delete(0,END);
    return;

def update_Entry(inputValue):
    #Updates the entry when a button is pressed.
    currentText = num1.get();
    update = num1.set(currentText + inputValue);

#Parent Window.
root = Tk();
root.title('Calculator ++ [1.7.2]');
root.geometry('350x450');

#Main entry.
num1 = StringVar();
txtDisplay = Entry(root, textvariable = num1, relief=RIDGE, bd = 10, width=33, insertwidth = 1, font = 40, justify=RIGHT);
txtDisplay.place(x=15, y=10);
txtDisplay.focus();

print(txtDisplay.get())

#Buttons:
zeroButton = Button(root, text='0', width=20, height=3, bg='LightBlue', fg='red', command=lambda:update_Entry('0'));
zeroButton.place(x=17,y=382);
oneButton = Button(root, text='1', width=8, height=3, bg='LightBlue', fg='red', command=lambda:update_Entry('1'));
oneButton.place(x=17, y=302);
twoButton = Button(root, text='2', width=8, height=3, bg='LightBlue', fg='red', command=lambda:update_Entry('2'));
twoButton.place(x=100, y=302);
threeButton = Button(root, text='3', width=8, height=3, bg='LightBlue', fg='red', command=lambda:update_Entry('3'));
threeButton.place(x=182, y=302);
fourButton = Button(root, text='4', width=8, height=3, bg='LightBlue', fg='red', command=lambda:update_Entry('4'));
fourButton.place(x=17, y=222);
fiveButton = Button(root, text='5', width=8, height=3, bg='LightBlue', fg='red', command=lambda:update_Entry('5'));
fiveButton.place(x=100, y=222);
sixButton = Button(root, text='6', width=8, height=3, bg='LightBlue', fg='red', command=lambda:update_Entry('6'));
sixButton.place(x=182, y=222);
sevenButton = Button(root, text='7', width=8, height=3, bg='LightBlue', fg='red', command=lambda:update_Entry('7'));
sevenButton.place(x=17, y=142);
eightButton = Button(root, text='8', width=8, height=3, bg='LightBlue', fg='red', command=lambda:update_Entry('8'));
eightButton.place(x=100, y=142);
ninthButton = Button(root, text='9', width=8, height=3, bg='LightBlue', fg='red', command=lambda:update_Entry('9'));
ninthButton.place(x=182, y=142);

decimalButton = Button(root, text='.', width=8, height=3, bg='powder blue', command=lambda:update_Entry('.'));
decimalButton.place(x=182, y=382);
equalButton = Button(root, text='=', width=8, height=8, bg='Lightgreen', command=lambda:update_Entry('='));
equalButton.place(x=264, y=307);
plusButton = Button(root, text='+', width=8, height=3, bg='gray', command=lambda:update_Entry('+'));
plusButton.place(x=264, y=222);
minusButton = Button(root, text='-', width=8, height=3, bg='gray', command=lambda:update_Entry('-'));
minusButton.place(x=264, y=142);
multiplyButton = Button(root, text='x', width=8, height=3, bg='gray', command=lambda:update_Entry('*'));
multiplyButton.place(x=264, y=66);
divideButton = Button(root, text='÷', width=8, height=3, bg='gray', command=lambda:update_Entry('/'));
divideButton.place(x=182, y=66);
clearButton = Button(root, text='Clear (CE)', width=20, height=3, command = clear, bg='Orange');
clearButton.place(x=17, y=66);

#Locks the parent windows size.
root.maxsize(350,450);
root.minsize(350,450);

#Parent window's background color:
root.configure(background = 'black');
root.mainloop();

Screenshot:

Answer 1

For something this simple, try having this as the command for your equalButton :

def evaluate():
    currentText = num1.get()
    try:
        num1.set(str(eval(currentText)))
    except SyntaxError:
        num1.set('<ERROR>')