Calc PRO MAX

from tkinter import *

root = Tk()
root.resizable(0,0)
root['bg'] = '#1e2936'
texts = [
    'DEL', 'C', 'x²', '√',
    '7', '8', '9', '+',
    '4', '5', '6', '-',
    '1', '2', '3', 'x',
    '.', '0', '=', '÷'
]

def add(num):
    global first, operation
    first = num
    e.delete(0,'end')
    operation = 'add'
    return 'break'

def sub(num):
    global first, operation
    first = num
    e.delete(0,'end')
    operation = 'sub'
    return 'break'

def mult(num):
    global first, operation
    first = num
    e.delete(0,'end')
    operation = 'mult'
    return 'break'

def div(num):
    global first, operation
    first = num
    e.delete(0,'end')
    operation = 'div'
    return 'break'

def equals():
    final = e.get()
    e.delete(0,'end')
    if operation == 'add':
        e.insert('end',int(first)+int(final))
    if operation == 'sub':
        e.insert('end',int(first)-int(final))
    if operation == 'mult':
        e.insert('end',int(first)*int(final))
    if operation == 'div':
        e.insert('end',int(int(first)/int(final)))

def evaluator(btn):
    if btn.cget('text') in '1234567890.':
        e.insert('end',btn.cget('text'))
    if btn.cget('text') in ('+', '-', 'x', '÷', '√', 'x²'):
        if btn.cget('text') == '+':
            add(e.get())
        if btn.cget('text') == '-':
            sub(e.get())
        if btn.cget('text') == 'x':
            mult(e.get())
        if btn.cget('text') == '÷':
            div(e.get())
    if btn.cget('text') in ("C", "DEL"):
        if btn.cget('text') == 'C':
            num = e.get()[:-1]
            e.delete(0,'end')
            e.insert('end',num)
        if btn.cget('text') == 'DEL':
            e.delete(0,'end')
    if btn.cget('text') == '=':
        equals()
    e.focus()

def validation(inp):
    if inp.isdigit():
        return True
    elif inp == '':
        return True
    else:
        return False

reg = root.register(validation)
e = Entry(root,fg='white',font=('',24,'bold'),bg='#1e2936',validatecommand=(reg,'%P'),validate='key',bd=0,justify='right')
e.grid(row=0,column=0,columnspan=4,sticky='news',pady=10,padx=5)
e.focus()

btns = []
img = PhotoImage(width=1,height=1)

for i in range(5):
    for j in range(4):
        text = texts[4*i+j]
        if text in '1234567890.': color = "#10B981"
        elif text in ('+', '-', 'x', '÷', '√', 'x²'): color = "#F59E0B"
        elif text in "=": color = "#047857"
        elif text in ("C", "DEL"): color = "#2563EB"

        btn = Button(root,text=text,fg='white',image=img,compound='t',width=100)
        btn.config(height=100,relief='flat',font=('',18,'bold'),bg=color)
        btn.config(command=lambda i=btn: evaluator(i))
        btns.append(btn)
        btns[-1].grid(row=i+1,column=j,padx=5,pady=5)

root.bind('<plus>',lambda event: add(e.get()))
root.bind('<minus>',lambda event: sub(e.get()))
root.bind('<asterisk>',lambda event: mult(e.get()))
root.bind('<slash>',lambda event: div(e.get()))
# root.bind('<equal>',lambda event: equals())
root.bind('<Return>',lambda event: equals())

root.mainloop()