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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(self, remote, local=None):
 """ Gets the file from FTP server local can be: a file: opened for writing, left open a string: path to output file None: contents are returned """

        if isinstance(local, file_type):  # open file, leave open
            local_file = local
        elif local is None:  # return string
            local_file = buffer_type()
        else:  # path to file, open, write/close return None
            local_file = open(local, 'wb')

        self.conn.retrbinary("RETR %s" % remote, local_file.write)

        if isinstance(local, file_type):
            pass
        elif local is None:
            contents = local_file.getvalue()
            local_file.close()
            return contents
        else:
            local_file.close()

        return None