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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def startup_script(self):
 """ Returns the content of the current startup script """


        script_file = self.script_file
        if script_file is None:
            return None

        try:
            with open(script_file, "rb") as f:
                return f.read().decode("utf-8", errors="replace")
        except OSError as e:
            raise VPCSError('Cannot read the startup script file "{}": {}'.format(script_file, e))