from tkinter import *

root = Tk()

counter = DoubleVar()

r = StringVar()

i = StringVar()

counter.set(0)

def sphere():

try:

counter.set(4/3*3.14*int(r.get())**3)

except:

counter.set("Ошибка")

def write():

if i.get()=="Текст":

with open("text.txt", 'w') as output_file:

output_file.write(str(counter.get()))

else:

with open("text.html", 'w') as output_file:

output_file.write(str(counter.get()))

Label(text="Программа для вычисления объема",fg="#eee", bg="#333",font="Arial 11").grid(row=0, column=2)

Label(text="Введите радиус:").grid(row=1, column=0)

table_name = Entry(width=15,textvariable= r)

table_name.grid(row=1, column=1, columnspan=3)

Label(text="Результат вычислений ").grid(row=2, column=0)

table_row = Label(width=15,textvariable=counter)

table_row.grid(row=2, column=3)

Button(text="Вычислить",command = sphere).grid(row=3, column=2)

Button(text="Сохранить",command = write).grid(row=4, column=0)

i.set("Выпадающий список")

OptionMenu(root,i,"Текст","HTML").grid(row=4,column=3)

root.mainloop()