[Python] How do I check if the username's length is too long

I have this function that will take 3 parameters, and display it on a label once a button is pressed.

It doesn't work (

Here is the code for the function:

def display_username(firstname, middlename, lastname): # this function will take 3 parameters, the first name, last name, and middle name of the user

while i==0 :
full_name = f"{firstname} {middlename} {lastname}" # using a formatted string to piece the component of the full name together, defining it as full_name
label.config( text=f"Hello, {full_name}!") # configure the label create earlier to display the full_name and with the word 'Hello' in front of it as a greeting message
label.place(x=300,
y=150) # configure the location of the label to appear acoordingly at those x and y coordinates on the app
i == 1
if len(firstname_entry.get(1.0,END)) > 6:
tkinter.messagebox.showinfo("Notification",'First name is too long!, should be less than 6 characters')
elif len(middlename_entry.get(1.0,END)) > 10:
tkinter.messagebox.showinfo("Notification", 'Middle name is too long!, should be less than 10 characters')
elif len(lastname_entry.get(1.0,END)) > 7:
tkinter.messagebox.showinfo("Notification", 'Last name is too long!, should be less than 7 characters')


Here is the code for the button:

Submit_name = Button(tab1, text='Say Hello',command=lambda: display_username(firstname_entry.get(), middlename_entry.get(),lastname_entry.get()))
# create a button for the using the display username function, displaying the user's information in first->last name order by getting the information typed in the texbox. The command = lambda is used to take the value of first name, middle name and last name to pass it t the display_user function
Submit_name.place(x=400, y=200, width=150, height=30)
# define the location for the button


i want it to check for the length of first, middle and last name and send users a notification saying their name is too long and do nothing until the name is at a desirable. I also want it to take parameters and also use while loops in the function. IT doesnt work, the terminal said that it took 1 positional argument but 3 were given

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