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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_assign(self, node, parent):
 """visit a Assign node by returning a fresh instance of it"""

        type_annotation = self.check_type_comment(node)
        newnode = nodes.Assign(node.lineno, node.col_offset, parent)
        newnode.postinit(
            targets=[self.visit(child, newnode) for child in node.targets],
            value=self.visit(node.value, newnode),
            type_annotation=type_annotation,
        )
        return newnode