要修改從父類別繼承的子類別方法中的裝飾器參數，您必須明確重寫該方法本身。 簡單地定義具有匹配名稱的新類別變數不會改變裝飾器的行為。裝飾器參數是在裝飾方法時綁定的，而不是在實例化類別時綁定的。
說明性範例
以下 Python 程式碼 (test.py) 示範了這一點：
<code class="language-python">def my_decorator_with_args(param1, param2):
"""Decorator accepting arguments"""
def actual_decorator(func):
def wrapper(self, *args, **kwargs):
print(f"[Decorator] param1={param1}, param2={param2}")
return func(self, *args, **kwargs)
return wrapper
return actual_decorator
class BaseClass:
@my_decorator_with_args(param1="BASE_PARAM1", param2="BASE_PARAM2")
def greet(self):
print("Hello from BaseClass!")
class DerivedClass(BaseClass):
"""
Attempting to override decorator arguments via class variables;
however, since `greet()` isn't redefined, the parent's decorator remains active.
"""
param1 = "DERIVED_PARAM1"
param2 = "DERIVED_PARAM2"
class DerivedClassOverride(BaseClass):
"""
Correctly overrides `greet()` to utilize modified decorator arguments.
"""
@my_decorator_with_args(param1="OVERRIDE_PARAM1", param2="OVERRIDE_PARAM2")
def greet(self):
print("Hello from DerivedClassOverride!")
if __name__ == "__main__":
print("=== BaseClass's greet ===")
b = BaseClass()
b.greet()
print("\n=== DerivedClass's greet (no override) ===")
d = DerivedClass()
d.greet()
print("\n=== DerivedClassOverride's greet (with override) ===")
d_o = DerivedClassOverride()
d_o.greet()
</code>執行python test.py會產生：
<code>=== BaseClass's greet === [Decorator] param1=BASE_PARAM1, param2=BASE_PARAM2 Hello from BaseClass! === DerivedClass's greet (no override) === [Decorator] param1=BASE_PARAM1, param2=BASE_PARAM2 Hello from BaseClass! === DerivedClassOverride's greet (with override) === [Decorator] param1=OVERRIDE_PARAM1, param2=OVERRIDE_PARAM2 Hello from DerivedClassOverride!</code>
這清楚地表明，只有在子類別中重新定義方法（greet）才能成功覆蓋裝飾器的參數。
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