Composite pattern is a structural design pattern, which allows objects to be combined into a Tree structure, and can handle each object in a unified way. This pattern combines objects to form a Tree structure, so that users can call single objects and composite objects consistently. Implementing composite patterns in Python can be done as follows: 1. Create an abstract base class as the basis for composition and define commonly used methods in composition. This abstract base class can be an interface or an abstract class. ```python from abc import ABC, abstractmethod class Component(ABC): @abstractmethod def operation(self): pass ``` 2. Create a leaf node class to implement leaf node objects in the combination. ```python class Leaf(Component): def operation(self): print("Leaf operation") ``` 3. Create a composite node class, implement composite node objects in the composite, and save child nodes. ```python class Composite(Component): def __init__(self): self.children = [] def add(self, component): self.children.append(component) def remove(self, component): self.children.remove(component) def operation(self): print("Composite operation") for child in self.children: child.operation() ``` 4. Create client code and use composite nodes to combine multiple objects. ```python def main(): root = Composite() leaf1 = Leaf() leaf2 = Leaf() root.add(leaf1) root.add(leaf2) root.operation() if __name__ == "__main__": main() ``` After running the code, the output result is: ``` Composite operation Leaf operation Leaf operation ``` In this example, Component is an abstract base class, which is implemented by Leaf and Composite respectively. Leaf represents the leaf node in the combination, while Composite represents the composite node in the combination. In the client code, we created a root node and added two leaf nodes, leaf1 and leaf2, to the root node. When calling the operation method of the root node, the operation methods of all child nodes are sequentially called, and the output result is the operation result of each node. This is the basic steps and sample code for implementing composite patterns using Python.