'Retrieve data from the clipboard on window\'s display.
The window keyword defaults to the root window of the Tkinter
application.
The type keyword specifies the form in which the data is
to be returned and should be an atom name such as STRING
or FILE_NAME.  Type defaults to STRING.
This command is equivalent to:
selection_get(CLIPBOARD)'

def clipboard_get(self, **kw):

    return self.tk.call((('clipboard', 'get') + self._options(kw)))
