使在cython中定义的类可打补丁

# mymodule.pyx
cdef class CythonClass:
    cdef public int value
    def __init__(self, int v):
        self.value = v

# mymodule_wrapper.py
from mymodule import CythonClass

class WrapperClass:
    def __init__(self, v):
        self._cython_obj = CythonClass(v)

    def get_value(self):
        return self._cython_obj.value

    def set_value(self, v):
        self._cython_obj.value = v

def new_get_value(self):
    return self._cython_obj.value * 2

WrapperClass.get_value = new_get_value

# mymodule.pyx
cdef void my_function(int *value) nogil:
    *value *= 2

cdef class CythonClass:
    cdef public int value
    cdef void (*func_ptr)(int *)
    def __init__(self, int v):
        self.value = v
        self.func_ptr = &my_function

    def apply_patch(self):
        with nogil:
            self.func_ptr(&self.value)