Calculator_using_tkinter_in_python/calc.py at main · aryan7081/Calculator_using_tkinter_in_python · GitHub

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from tkinter import*
import parser
from functools import reduce

root = Tk()

root.title('Calculator')


# GETTING THE USER INPUT
i = 0
def get_variable(num):
    global i
    display.insert(i,num)
    i += 1

# OPERATORS

def get_operator(numb):
    global i
    lenght = len(numb)
    display.insert(i,numb)
    i += lenght

# clearing display

def clear_display():
    display.delete(0,END)


# DELETING SINGLE ELEMENT
def single_element():
    entire_string = display.get()
    if len(entire_string):
        new_string = entire_string[:-1]
        clear_display()
        display.insert(0,new_string)

    else:
        display.insert(0,'Error')


# ADDING INPUT FIELD


display = Entry(root)
display.grid(row =1, columnspan = 6,sticky = W+E)


# FACTORIAL COMMAND

def fact(num):
    global i
    display.insert(i,'!')
    i+=1

    lst = []
    for i in range(num,0,-1):

        lst.append(i)


    x = reduce(lambda a,b:a*b, lst )
    display.insert(x)

# CALCULATE

def calculate():
    entire_string = display.get()
    try:
        a = parser.expr(entire_string).compile()
        result = eval(a)
        clear_display()
        display.insert(0,result)

    except Exception:
        clear_display()
        display.insert(0,'Error')


# ADDING BUTTON TO CALCULATOR

Button(root,text='1', command = lambda :get_variable(1)).grid(row=2,column=0,padx = 5,pady = 4)
Button(root,text='2', command = lambda :get_variable(2)).grid(row=2,column=1,padx = 5,pady = 4)
Button(root,text='3', command = lambda :get_variable(3)).grid(row=2,column=2,padx = 5,pady = 4)

Button(root,text='4', command = lambda :get_variable(4)).grid(row=3,column=0,padx = 5,pady = 4)
Button(root,text='5', command = lambda :get_variable(5)).grid(row=3,column=1,padx = 5,pady = 4)
Button(root,text='6', command = lambda :get_variable(6)).grid(row=3,column=2,padx = 5,pady = 4)

Button(root,text='7', command = lambda :get_variable(7)).grid(row=4,column=0,padx = 5,pady = 4)
Button(root,text='8', command = lambda :get_variable(8)).grid(row=4,column=1,padx = 5,pady = 4)
Button(root,text='9', command = lambda :get_variable(9)).grid(row=4,column=2,padx = 5,pady = 4)

Button(root,text='+', command = lambda : get_operator('+')).grid(row=2,column=3,padx = 5,pady = 4)
Button(root,text='-', command = lambda : get_operator('-')).grid(row=3,column=3,padx = 5,pady = 4)
Button(root,text='*', command = lambda : get_operator('*')).grid(row=4,column=3,padx = 5,pady = 4)
Button(root,text='AC', command = lambda : clear_display()).grid(row=5,column=0,padx = 5,pady = 4)
Button(root,text='0', command = lambda :get_variable(0)).grid(row=5,column=1,padx = 5,pady = 4)
Button(root,text='=',command = lambda : calculate()).grid(row=5,column=2,padx = 5,pady = 4)
Button(root,text='/', command = lambda : get_operator('/')).grid(row=5,column=3,padx = 5,pady = 4)

Button(root,text = 'pi', command = lambda : get_operator('*3.14')).grid(row = 2,column =4, padx = 5, pady = 4)
Button(root,text = '%', command = lambda : get_operator('%')).grid(row = 3,column = 4, padx = 5, pady = 4)
Button(root,text = '(', command = lambda : get_operator('(')).grid(row = 4,column = 4, padx = 5, pady = 4)
Button(root,text = 'exp', command = lambda : get_operator('**')).grid(row = 5,column = 4, padx = 5, pady = 4)


Button(root,text = '<-',command = lambda: single_element()).grid(row = 2,column = 5, padx = 5, pady = 4)
Button(root,text = 'X!', command = lambda : get_operator('X!')).grid(row = 3,column = 5, padx = 5, pady = 4)
Button(root,text = ')', command = lambda : get_operator(')')).grid(row = 4,column = 5, padx = 5, pady = 4)
Button(root,text = '**2', command = lambda : get_operator('**2')).grid(row =5,column = 5, padx = 5, pady = 4)


root.mainloop()