4 Oop: Python 3 Deep Dive Part
from typing import List
Advanced OOP in Python is about understanding the that underpins the language. Descriptors explain how properties work. Metaclasses explain how classes work. The MRO explains multiple inheritance. python 3 deep dive part 4 oop
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class PositiveInteger(int): def __new__(cls, value): if value < 0: raise ValueError("Value must be positive") return super().__new__(cls, value) The MRO explains multiple inheritance
c1 = Config("production") c2 = Config("test") print(c1 is c2) # True print(c1.environment) # production (the second call is ignored)
class AutoGreetMeta(type): """Metaclass that automatically adds a 'greet' method.""" def __new__(mcs, name, bases, namespace): if 'name' in namespace: def greet(self): return f"Hello, I'm {self.name}" namespace['greet'] = greet return super().__new__(mcs, name, bases, namespace)