pointer.py

import ctypes

class Point(ctypes.Structure):
    _fields_ = (
        ("x", ctypes.c_int),
        ("y", ctypes.c_int))

p1 = Point(23, 4)
print 'Original point is', (p1.x, p1.y)

addr = ctypes.addressof(p1)
print 'C address is', addr

# read the memory address as a pointer to a Point structure
p_p2 = ctypes.cast(addr, ctypes.POINTER(Point))

# access to the content directly, we don't need the pointer anymore.
p2 = p_p2.contents

# values of the casted/memory pointer should be the same :)
print 'Memory point is', (p2.x, p2.y)