I want to make sure that when a person does not drive anything into a string, it gives an error. Help, how can I do this?

Question

def rasp():

save = {}
save = title_login.get()
doc = open("login.txt", "wb")
pickle.dump(save, doc)
doc.close()

doc = open("login.txt", "rb")
doc_op = pickle.load(doc)
if title_login.get() == "":
messagebox.showerror("Ошибка!")
messagebox.showerror_frame = Frame(rasp, bg='white')
messagebox.showerror_frame.pack()
messagebox.showerror(messagebox.showerror_frame, text='Введите имя!,', bg='white', font=40)

frame = Frame(reg, bg='pink')
frame.place(relx=0.05, rely=0.05, relwidth=0.9, relheight=0.9)

title = Label(frame, text='{}, вот ваше расписание!:'.format(urName.get()), bg='purple')
title.place(relx=0.2, rely=0.2, relwidth=0.2, relheight=0.1)
title.pack()

Answer 1

Provide full code this part is not enough.
To share code firstly go to code section make a new code, paste your code. And then share the code link in the question

Answer 2

I solved my problem