исходный код калькулятора Python
import tkinter as tk
root=tk.Tk()
root.geometry("198x125")
root.title("Calculator")
display= tk.Entry(root, width=33, bg="pink")
display.grid(row=1, column=0, columnspan=5)
def click(key):
if key =='=':
str1="123456789"
if display.get() [0] not in str1:
display.insert(tk.END, "First character is not valid")
try:
result=eval(display.get())
display.insert(tk.END, "="+str(result))
except:
display.insert(tk.END, "--> ERROR")
elif key== 'C':
display.delete(0, tk.END)
if '=' in display.get():
entry.display(0, tk.END)
else:
if '=' in display.get():
display.get(0, tk.END)
display.insert(tk.END, key)
button_list = [
'7','8','9','/',
'4','5','6','*',
'1','2','3','-',
'0','+','C','=',]
r = 2
c = 0
for t in button_list:
cmd=lambda x=t: click(x)
tk.Button(root, text=t, width=5, command=cmd).grid(row=r, column=c)
c +=1
if c > 3:
c = 0
r +=1
root.mainloop()
Alpha The Programmer