Four Years Remaining

Can't help sharing this lovely example, illustrating the way Python interns small integers, the lower level use of the id function as well as the power of the ctypes module.

import ctypes
def deref(addr, type_):
    return ctypes.cast(addr, ctypes.POINTER(type_))

deref(id(29), ctypes.c_int)[4] = 100

> 29
100

> 29*100
10000

> 25+4
100

Note that depending on the version of Python the value of the integer may be stored at either offset [4] or [6].