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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 tree_has_single_path(self, node):
 """ If there is a single path in the tree, return True, else return False. """

        num_children = len(node.children)
        if num_children > 1:
            return False
        elif num_children == 0:
            return True
        else:
            return True and self.tree_has_single_path(node.children[0])