Introduction
Sometimes you must modify/fix someone else's code. Sometimes you find code on the internet which is close to a solution for a problem you are working on. Sometimes you just want to tinker.
This is such a problem.
The Existing code is a GUI (uses Tk) and contains a calculator. Your task, should you accept it, is to modify/fix the existing code. Remove the calculator into its own program. Then make it better.
Note:
Project Description
Part A: Move existing calculator code into its own program
Part B: Modify existing code → fixed code
Part C: Next modify fixed code → improved code
Part D: Improved error reporting
Part E: Add the "%" (modulus) operator
Part F: Add the "//" (floor division) operator
Part G: Add the capability to enter binary, octal, decimal, and hexadecimal numbers
Examples of Binary, Octal, Decimal, and Hexadecimal Numbers (as Strings)
xyz> python3 >>> 33 + 0b011 <--- binary 36 >>> 33 + 0o011<--- octal 42 >>> 33 + 011<--- decimal File "<stdin>", line 1 33 + 011 ^ SyntaxError: invalid token >>> 33 + 11<--- decimal 44 >>> 33 + 0xa3<--- hexadecimal 196 >>>quit()
Existing Code
#! /usr/bin/python3 # =================================================================== # Calculator Code To Modify/Fix # =================================================================== from tkinter import * # Python 3 import random import time; root = Tk() root.geometry("1600x800+0+0") root.title("Restaurant Management System") text_Input = StringVar() operator = '' Tops = Frame(root,width=1600,height=50,bg='powder Blue',relief=SUNKEN) Tops.pack(side=TOP) f1 = Frame(root,width=800,height=700,bg='powder Blue',relief=SUNKEN) f1.pack(side=LEFT) f2 = Frame(root,width=300,height=700,bg='powder Blue',relief=SUNKEN) f2.pack(side=RIGHT) # ==========Time===================================================== localtime=time.asctime(time.localtime(time.time())) # ==========Info===================================================== lbInfo = Label(Tops,font=('arial',50,'bold'), text='Restauraunt Management System', fg='steel Blue',bd=10,anchor='w') lbInfo.grid(row=0,column=0) lbInfo = Label(Tops,font=('arial',20,'bold'),text=localtime, fg='steel Blue',bd=10,anchor='w') lbInfo.grid(row=1,column=0) # ==========Calculator=============================================== def btnClick(numbers): global operator operator = operator + str(numbers) text_Input.set(operator) def btnClearDisplay(): global operator operator='' text_Input.set('') def btnEqualsInput(): global operator sumup = str(eval(operator)) text_Input.set(sumup) operator='' txtDisplay = Entry(f2,font=('arial',20,'bold'), textvariable=text_Input, bd=30,insertwidth=4,bg="powder blue",justify='right') txtDisplay.grid(columnspan=4) btn7=Button(f2,padx=16,pady=16,bd=8,fg='black',font=('arial',20,'bold'), text='7',bg='powder blue',command=lambda: btnClick(7)).grid(row=2,column=0) btn8=Button(f2,padx=16,pady=16,bd=8,fg='black',font=('arial',20,'bold'), text='8',bg='powder blue',command=lambda: btnClick(8)).grid(row=2,column=1) btn9=Button(f2,padx=16,pady=16,bd=8,fg='black',font=('arial',20,'bold'), text='9',bg='powder blue',command=lambda: btnClick(9)).grid(row=2,column=2) addition=Button(f2,padx=16,pady=16,bd=8,fg='black',font=('arial',20,'bold'), text='+',bg='powder blue',command=lambda: btnClick('+')).grid(row=2,column=3) # ------------------------------------------------------------------- btn4=Button(f2,padx=16,pady=16,bd=8,fg='black',font=('arial',20,'bold'), text='4',bg='powder blue',command=lambda: btnClick(4)).grid(row=3,column=0) btn5=Button(f2,padx=16,pady=16,bd=8,fg='black',font=('arial',20,'bold'), text='5',bg='powder blue',command=lambda: btnClick(5)).grid(row=3,column=1) btn6=Button(f2,padx=16,pady=16,bd=8,fg='black',font=('arial',20,'bold'), text='6',bg='powder blue',command=lambda: btnClick(6)).grid(row=3,column=2) subtraction=Button(f2,padx=16,pady=16,bd=8,fg='black',font=('arial',20,'bold'), text='-',bg='powder blue',command=lambda: btnClick('+')).grid(row=3,column=3) # ------------------------------------------------------------------- btn1=Button(f2,padx=16,pady=16,bd=8,fg='black',font=('arial',20,'bold'), text='1',bg='powder blue',command=lambda: btnClick(1)).grid(row=4,column=0) btn2=Button(f2,padx=16,pady=16,bd=8,fg='black',font=('arial',20,'bold'), text='2',bg='powder blue',command=lambda: btnClick(2)).grid(row=4,column=1) btn3=Button(f2,padx=16,pady=16,bd=8,fg='black',font=('arial',20,'bold'), text='3',bg='powder blue',command=lambda: btnClick(3)).grid(row=4,column=2) multiply=Button(f2,padx=16,pady=16,bd=8,fg='black',font=('arial',20,'bold'), text='*',bg='powder blue',command=lambda: btnClick('*')).grid(row=4,column=3) # ------------------------------------------------------------------- btn0=Button(f2,padx=16,pady=16,bd=8,fg='black',font=('arial',20,'bold'), text='0',bg='powder blue',command=lambda: btnClick(0)).grid(row=5,column=0) btnClear=Button(f2,padx=16,pady=16,bd=8,fg='black',font=('arial',20,'bold'), text='C',bg='powder blue',command=btnClearDisplay).grid(row=5,column=1) btnEquals=Button(f2,padx=16,pady=16,bd=8,fg='black',font=('arial',20,'bold'), text='=',bg='powder blue',command=btnEqualsInput).grid(row=5,column=2) division=Button(f2,padx=16,pady=16,bd=8,fg='black',font=('arial',20,'bold'), text='/',bg='powder blue',command=lambda: btnClick('/')).grid(row=5,column=3) # ------------------------------------------------------------------- root.mainloop()