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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 setpassword(self, password):
 """Sets the password to use when extracting. """

        self._password = password
        if self._file_parser:
            if self._file_parser.has_header_encryption():
                self._file_parser = None
        if not self._file_parser:
            self._parse()
        else:
            self._file_parser.setpassword(self._password)