exchange office program

Question

Hi! I have to code in python exchange office program, creating label with two plus two rows and four columns, like this:
from tkinter import*
def change ():
input=int(entry.get())
input=input*1/120
оutput_label.configure(text = 'Euros: {:.1f}'.format(input))
entry.delete(0,END)
root = Tk()
message_label = Label(text='Input amount in rsd',font=('Verdana', 16))
оutput_label = Label(font=('Verdana', 16))
entry = Entry(font=('Verdana', 16), width=8)
calc_button = Button(text='Change', font=('Verdana', 16),command=change)
message_label.grid(row=0, column=0)
entry.grid(row=0, column=1)
calc_button.grid(row=0, column=2)
оutput_label.grid(row=1, column=0, columnspan=3)
#mainloop() when mainloop is witout hashtag work changing into dinars only,
def promeni ():
input=int(entry.get())
input=input*120
оutput_label.configure(text = 'Dinars: {:.1f}'.format(input))
entry.delete(0,END)
message_label = Label(text='Input amount in Euros',font=('Verdana', 16))
оutput_label = Label(font=('Verdana', 16))
entry = Entry(font=('Verdana', 16), width=8)
calc_button = Button(text='Change', font=('Verdana', 16),command=change)
message_label.grid(row=2, column=0)
entry.grid(row=2, column=1)
calc_button.grid(row=2, column=2)
оutput_label.grid(row=3, column=0, columnspan=3)
mainloop()
#this way everything is visible but when I put amount in dinars python reports literal error
Could anyone help me with this? Thx a lot!

Answer 1

maybe locale can help?
https://docs.python.org/3/library/locale.html

Answer 2

what does {:.1f} mean in line
оutput_label.configure(text = 'Euros: {:.1f}'.format(input))