修改类定义可以通过单继承,多继承(mixin),以及元类等。其实,装饰器也可以修改类定义,并且和上述提到的方案相比,更简洁直观,性能也更强。
如下:
def log_getattribute(cls):
# Get the original implementation
orig_getattribute = cls.__getattribute__
# Make a new definition
def new_getattribute(self, name):
print('getting', name)
return orig_getattribute(self, name)
# Attach to the class and return
cls.__getattribute__ = new_getattribute
return cls
@log_getattribute
class A:
def __init__(self, x):
self.x = x
def spam(self):
pass
>>> a = A(42)
>>> print(a.x)
getting x
42
>>> a.spam()
getting spam
原文:https://www.cnblogs.com/jeffrey-yang/p/12261568.html