How can I annotate a class in pypy?

I am using pypy to translate some python script to C language. Say that I have a python class like this:

class A:
    def __init__(self):
        self.a = 0
    def func(self): 
        pass

I notice that A.func is a unbound method rather than a function so that it cannot be translated by pypy. So I change the code slightly:

def func(self): 
    pass
class A:
    def __init__(self):
        self.a = 0
A.func = func
def target(*args):
    return func, None

Now func seems to be able to be translate开发者_如何学God by pypy. However when I try translate.py --source test.py, an exception [translation:ERROR] TypeError: signature mismatch: func() takes exactly 2 arguments (1 given) is raised. I notice that it might because I haven't annotate self argument yet. However this self have type A, so how can I annotate a class?

Thank you for your reading and answer.

Essentially PyPy's entry point is a function (accepting sys.argv usually as an argument). Whatever this function calls (create objects, call methods) will get annotated. There is no way to annotate a class, since PyPy's compiled code does not export this as API, but rather as a standalone program.

You might want to for example:

def f():
    a = A()
    a.func()

or even:

a = A()
def f():
   a.func()

in which case a is a prebuilt constant.

Are you wanting a staticmethod or a classmethod?