The `addChild` method in the `tree.Tree` class in Python allows us to add a new child node to an existing node in a tree structure. This method is used to expand the tree by creating a new node and adding it as a child to the specified parent node. The `addChild` method takes the child node as an input parameter and adds it to the parent node's list of children. This enables us to create a hierarchical structure where nodes can have multiple levels of children, making it easier to represent and manipulate data in a tree-like manner.
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