How to Create Scientific Calculator in Python - Part 2 of 3

How to Create Scientific Calculator in Python, using Mathematical functions, Function Declaration, and the following widget, Entry, Label, Button, Frame, and Menu.

See various Mathematical functions on Python Software

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[rbi]

how could you learn all these languages? and have tried Windev (pc soft)?

[mokshaeducation]

I need help. This is the error I am getting when I am trying to run:
Traceback (most recent call last):
File "C:/Users/moniy/PycharmProjects/calc/main.py", line 18, in <module>
txtDisplay = Entry(calc, font('arial', 20, 'bold'), bg="powder blue", bd=30, width=28, justify=RIGHT)
TypeError: 'NoneType' object is not callable

This is the code
from tkinter import *
import math
import parser
import tkinter.messagebox
from turtle import width

from pygame.examples.eventlist import font

root = Tk()
root.title("Scientific Calculator ")
blue")
root.resizable(width=True, height=True)
root.geometry("480x568+0+0")

calc = Frame(root)
calc.grid()

txtDisplay = Entry(calc, font('arial', 20, 'bold'), bg="powder blue", bd=30, width=28, justify=RIGHT)
txtDisplay.grid(row=0, column=0, columnspan=4, pady=1)
txtDisplay.insert(0, "0")


def iExit():
iExit = Calculator", "Confirm if you want to exit")
if iExit > 0:
root.destroy()
return


def Scientific():
root.resizable(width=True, height=True)
root.geometry("944x568+0+0")


def Standard():
root.resizable(width=True, height=True)
root.geometry("480x568+0+0")


menuBar = Menu(calc)

fileMenu = Menu(menuBar, tearoff=0)
menuBar.add_cascade(label="File", menu=fileMenu)
fileMenu.add_command(label="Standard", command=Standard)
fileMenu.add_command(label="Scientific", command=Scientific)
fileMenu.add_separator()
fileMenu.add_command(label="Exit", command=iExit)

editMenu = Menu(menuBar, tearoff=0)
menuBar.add_cascade(label="Edit", menu=editMenu)


editMenu.add_separator()


helpMenu = Menu(menuBar, tearoff=0)
menuBar.add_cascade(label="Help", menu=helpMenu)
help")

root.config(menu=menuBar)
root.mainloop()