将函数指针转换为可调用对象

将函数指针转换为可调用对象：可以参考这篇文章： https://www.baidu.com/link?url=6djl4oF9q-bjXsKIc7n5xA5eoO3YbD_ISURCaytWx9o0B2dmmEhXclgxb_R

ctypes 模块可被用来创建包装任意内存地址的Python可调用对象。 下面的例子演示了怎样获取C函数的原始、底层地址，以及如何将其转换为一个可调用对象：

>>> import ctypes
>>> lib = ctypes.cdll.LoadLibrary(None)
>>> # Get the address of sin() from the C math library
>>> addr = ctypes.cast(lib.sin, ctypes.c_void_p).value
>>> addr
140735505915760

>>> # Turn the address into a callable function
>>> functype = ctypes.CFUNCTYPE(ctypes.c_double, ctypes.c_double)
>>> func = functype(addr)
>>> func
<CFunctionType object at 0x1006816d0>

>>> # Call the resulting function
>>> func(2)
0.9092974268256817
>>> func(0)
0.0
>>>