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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 visit_keyword(self, node: AST, dfltChaining: bool = True) -> str: """Return representation of `node` as keyword arg."""

        arg = node.arg
        if arg is None:
            return f"**{self.visit(node.value)}"
        else:
            return f"{arg}={self.visit(node.value)}"