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Extend built-in types in Python

We can extend from built-in types and add some method or attribute

python

class Text(str):
    def duplicate(self):
        return self + self
class TrackableList(list):
    def append(self, obj):
        print("Append Done: " + str(obj))
        super().append(obj)
list_obj = TrackableList()
list_obj.append("1")
text = Text("Python")
print(text.duplicate())

Output

Append Done: 1
PythonPython

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