PyCon

deco.py

from trace import traced

def tracing(cls):
    cdict = cls.__dict__
    for n in cdict:
        if hasattr(cdict[n], "__call__") \
            and not n.startswith("__"):
            cdict[n] = traced(cdict[n])
    return cls

if __name__ == "__main__":
    @tracing
    class MyClass():
        def method1(self, a):
            print("Method 1:", a)
        def method2(self, a, b=10):
            return "Method 2: %s" % (a*b)

    mc = MyClass()
    mc.method1("Hooray!")
    print(mc.method2("Easy", b=3))

可是有 __call__ 的不一定就是方法呀…… 是不是用 descriptor 来做更好一些……