Calculator.py

from tkinter import *
import math
#calc class
class calc:
    def get(self):
        """ replace  x with  * and / """
        self.expression = self.e.get()
        self.newtext = self.expression.replace('/','/')
        self.newtext = self.newtext.replace('x','*')

    def equals(self):
        """when the equal button is pressed """
        self .get()
        try:
            #evaluate the expression using the eval function
            self.value = eval(self.newtext)
        except SyntaxError or NameError:
            self.e.delete(0,END)
            self.e.insert(0,'Valor Inválido')
        else:
            self.e.delete(0,END)
            self.e.insert(0,self.value)

    def squareroot(self):
        "squareroot method"
        self.get()
        try:
            #evaluate the expression using the eval function
            self.value = eval(self.newtext)
        except SyntaxError or NameError :
            self.e.delete(0,END)
            self.e.input(0,'Valor Inválido')
        else :
            self.sqrtval = math.sqrt(self.value)
            self.e.delete(0,END)
            self.e.insert(0,self.sqrtval)

    def square(self):
        #square method
        self.get()

        try:
            #evaluate the expresson using the eval funcition
            self.value = eval(self.newtext)
        except SyntaxError or NameError :
            self.e.delete(0,END)
            self.e.input(0,'Valor Inválido')
        else :
            self.sqval = math.pow(self.value,2)
            self.e.delete(0,END)
            self.e.insert(0,self.sqval)

    def clearall(self):
        """Funçã de limpar a calculadora"""
        self.e.delete(0,END)

    def clear1(self):
        self.txt = self.e.get()[:-1]
        self.e.delete(0,END)
        self.e.insert(0,self.txt)

    def action(self,argi):
        self.e.insert(END,argi)

    def __init__(self,master):
        """Método de construção"""
        master.title('Calculadora')
        master.geometry()
        self.e = Entry(master)
        self.e.grid(row=0,column=0,columnspan=6,pady=3)
        self.e.focus_set()

        #Gerando botoes
        Button(master,text="=",width=11,height=3,fg="blue",
               bg="orange",command=lambda:self.equals()).grid(row=4 , column=4,columnspan=2)
        Button(master, text='AC',width=5,height=3,
               fg="red",bg="light green",
               command=lambda:self.clearall()).grid(row=1,column=4)
        Button(master,text='C',width=5,height=3,
               fg="red",bg="light green",
               command=lambda:self.clear1()).grid(row=1,column=5)
        Button(master,text="+",width=5,height=3,
               fg="blue",bg="orange",
               command=lambda:self.action('+')).grid(row=4,column=3)
        Button(master, text="x", width=5, height=3,
               fg="blue", bg="orange",
               command=lambda: self.action('x')).grid(row=2, column=3)
        Button(master, text="-", width=5, height=3,
               fg="blue", bg="orange",
               command=lambda: self.action('-')).grid(row=3, column=3)
        Button(master, text="÷", width=5, height=3,
               fg="blue", bg="orange",
               command=lambda: self.action('/')).grid(row=1, column=3)
        Button(master, text="%", width=5, height=3,
               fg="blue", bg="orange",
               command=lambda: self.action('%')).grid(row=4, column=2)
        Button(master, text="÷", width=5, height=3,
               fg="blue", bg="orange",
               command=lambda: self.action('/')).grid(row=1, column=3)
        Button(master, text="7", width=5, height=3,
               fg="blue", bg="orange",
               command=lambda: self.action('7')).grid(row=1, column=0)
        Button(master,text="8",width=5,height=3,
               fg="blue",bg="light green",
               command=lambda:self.action('8')).grid(row=1,column=1)
        Button(master, text="9", width=5, height=3,
               fg="blue", bg="orange",
               command=lambda: self.action('9')).grid(row=1, column=2)
        Button(master, text="4", width=5, height=3,
               fg="blue", bg="light green",
               command=lambda: self.action('4')).grid(row=2, column=0)
        Button(master, text="5", width=5, height=3,
               fg="blue", bg="orange",
               command=lambda: self.action('5')).grid(row=2, column=1)
        Button(master, text="6", width=5, height=3,
               fg="blue", bg="light green",
               command=lambda: self.action('6')).grid(row=2, column=2)
        Button(master, text="1", width=5, height=3,
               fg="blue", bg="orange",
               command=lambda: self.action('1')).grid(row=3, column=0)
        Button(master, text="2", width=5, height=3,
               fg="blue", bg="light green",
               command=lambda: self.action('2')).grid(row=3, column=1)
        Button(master, text="3", width=5, height=3,
               fg="blue", bg="orange",
               command=lambda: self.action('3')).grid(row=3, column=2)
        Button(master, text="0", width=5, height=3,
               fg="white", bg="blue",
               command=lambda: self.action('0')).grid(row=4, column=0)
        Button(master, text=".", width=5, height=3,
               fg="red", bg="light green",
               command=lambda: self.action('.')).grid(row=4, column=1)
        Button(master, text="(", width=5, height=3,
               fg="white", bg="blue",
               command=lambda: self.action('(')).grid(row=2, column=4)
        Button(master, text=")", width=5, height=3,
               fg="blue", bg="orange",
               command=lambda: self.action(')')).grid(row=2, column=5)
        Button(master, text="√", width=5, height=3,
               fg="red", bg="light green",
               command=lambda: self.squareroot()).grid(row=3, column=4)
        Button(master, text="x²", width=5, height=3,
               fg="white", bg="blue",
               command=lambda: self.square()).grid(row=3, column=5)

root = Tk()
obj=calc(root)
root.mainloop()