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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 _get_input_buffer(self):

 """Return input buffer"""

        input_buffer = ''
        if self.current_prompt_pos is not None:
            input_buffer = self.get_text(self.current_prompt_pos, 'eol')
            input_buffer = input_buffer.replace(os.linesep, '\n')
        return input_buffer