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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_For(self, node):
 """ Handle iterate variable in for loops. Interval(low=-inf, high=2) Interval(low=2, high=inf) Interval(low=2, high=2) """

        assert isinstance(node.target, ast.Name), "For apply on variables."
        self.visit(node.iter)
        if isinstance(node.iter, ast.Call):
            for alias in self.aliases[node.iter.func]:
                if isinstance(alias, Intrinsic):
                    self.add(node.target.id,
                             alias.return_range_content(
                                 [self.visit(n) for n in node.iter.args]))

        self.visit_loop(node)