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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_loop(self, node, cond=None):
 """ Handle incremented variables in loop body. Interval(low=-inf, high=2) Interval(low=2, high=inf) Interval(low=2, high=2) """

        # visit once to gather newly declared vars
        for stmt in node.body:
            self.visit(stmt)

        # freeze current state
        old_range = self.result.copy()

        # extra round
        for stmt in node.body:
            self.visit(stmt)

        # widen any change
        for expr, range_ in old_range.items():
            self.result[expr] = self.result[expr].widen(range_)

        # propagate  the new informations
        cond and self.visit(cond)
        for stmt in node.body:
            self.visit(stmt)

        for stmt in node.orelse:
            self.visit(stmt)