[Python] Disable, hide or remove close "X" button in Tkinter

I want to show a GUI to client, but I don't want to give the possibility to the client to close the window through the [X] button.

How do I disable, hide or remove the close [X] button of Tkinter window?

I found the following answers:

1. Python Tkinter “X” button control
2. Removing minimize/maximize buttons in Tkinter

However, these posts are not answering my question. I want to disable, hide or completely remove the [X] button.

When I use protocol:

def __init__(self):
Frame.__init__(self, bg = "black")
self.protocol('WM_DELETE_WINDOW', self.doSomething)
self.pack(expand = 1, fill = BOTH)

def doSomething(self):
if showinfo.askokcancel("Quit?", "Are you sure you want to quit?"):
self.quit()


I receive the following error:

self.protocol('WM_DELETE_WINDOW', self.doSomething) AttributeError: 'GUI' object has no attribute 'protocol'
​

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