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calculator.py
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#author: Piotr Waksmundzki
from tkinter import *
import parser
from math import factorial
i = 0
#funkcja wprowadzenia cyfr
def get_variables(num):
global i
display.insert(i,num)
i += 1
#funcja wprowadzenia operatora mat.
def get_operation(operator):
global i
length = len(operator)
display.insert(i,operator)
i+=length
#funcja "wyczyść wszystko"
def clear_all():
display.delete(0,END)
#funkcja obliczenia
def calcualte():
entire_string = display.get()
try:
a = parser.expr(entire_string).compile()
result = eval(a)
clear_all()
display.insert(0,result)
except Exception:
clear_all()
display.insert(0,"Error")
#funkcja kasowania znaku
def undo():
entire_string = display.get()
if len (entire_string):
new_string = entire_string[:-1]
clear_all()
display.insert(0, new_string)
else:
clear_all()
display.insert(0,"Error")
#utworzenie okna
root = Tk()
root.geometry("350x500")
root.resizable(True,True)
root.title("Calculator by P.Waksmundzki")
display = Entry(root, font = 'arial 20 bold', justify= RIGHT)
display.grid(row = 1, columnspan = 6, sticky = N+E+W+S)
# konfiguracja dynamicznej siatki
Grid.rowconfigure(root,1,weight=1)
Grid.rowconfigure(root,2,weight=1)
Grid.rowconfigure(root,3,weight=1)
Grid.rowconfigure(root,4,weight=1)
Grid.rowconfigure(root,5,weight=1)
Grid.rowconfigure(root,6,weight=1)
Grid.columnconfigure(root,0,weight=1)
Grid.columnconfigure(root,1,weight=1)
Grid.columnconfigure(root,2,weight=1)
Grid.columnconfigure(root,3,weight=1)
#tworzenie przycisków cyfry
Button(root, text= "1", height= 5, width=10, command = lambda :get_variables(1)).grid(row=2,column=0, sticky=N+S+E+W)
Button(root, text= "2", height= 5, width=10, command = lambda :get_variables(2)).grid(row=2,column=1, sticky=N+S+E+W)
Button(root, text= "3", height= 5, width=10, command = lambda :get_variables(3)).grid(row=2,column=2, sticky=N+S+E+W)
Button(root, text= "4", height= 5, width=10, command = lambda :get_variables(4)).grid(row=3,column=0, sticky=N+S+E+W)
Button(root, text= "5", height= 5, width=10, command = lambda :get_variables(5)).grid(row=3,column=1, sticky=N+S+E+W)
Button(root, text= "6", height= 5, width=10, command = lambda :get_variables(6)).grid(row=3,column=2, sticky=N+S+E+W)
Button(root, text= "7", height= 5, width=10, command = lambda :get_variables(7)).grid(row=4,column=0, sticky=N+S+E+W)
Button(root, text= "8", height= 5, width=10, command = lambda :get_variables(8)).grid(row=4,column=1, sticky=N+S+E+W)
Button(root, text= "9", height= 5, width=10, command = lambda :get_variables(9)).grid(row=4,column=2, sticky=N+S+E+W)
Button(root, text= "AC", height= 5, width=10, command = lambda :clear_all()).grid(row=5,column=0, sticky=N+S+E+W)
Button(root, text= "0", height= 5, width=10, command = lambda :get_variables(0)).grid(row=5,column=1, sticky=N+S+E+W)
Button(root, text= ".", height= 5, width=10, command = lambda :get_variables(".")).grid(row=5,column=2, sticky=N+S+E+W)
#tworzenie przycisków operatrów matemtycznych
Button(root, text= "+", height= 5, width=10, command = lambda :get_operation("+")).grid(row=2,column=3, sticky=N+S+E+W)
Button(root, text= "-", height= 5, width=10, command = lambda :get_operation("-")).grid(row=3,column=3, sticky=N+S+E+W)
Button(root, text= "*", height= 5, width=10, command = lambda :get_operation("*")).grid(row=4,column=3, sticky=N+S+E+W)
Button(root, text= "/", height= 5, width=10, command = lambda :get_operation("/")).grid(row=5,column=3, sticky=N+S+E+W)
Button(root,text="=", height= 5, width=10, command= lambda :calcualte()).grid(row=6,column=0, sticky=N+S+E+W)
Button(root, text= "(", height= 5, width=10, command = lambda :get_variables("(")).grid(row=6,column=1, sticky=N+S+E+W)
Button(root, text= ")", height= 5, width=10, command = lambda :get_variables(")")).grid(row=6,column=2, sticky=N+S+E+W)
Button(root,text="<-", height= 5, width=10, command= lambda :undo()).grid(row=6,column=3, sticky=N+S+E+W)
root.mainloop()