尝试使用ctypes来获取void指针的大小:

import ctypes
print ctypes.sizeof(ctypes.c_voidp)

32位是4位，64位是8位。

根据abe32的回答，

import sys
n_bits = 32 << bool(sys.maxsize >> 32)

N_bits将有32或64位。

对于32位，它将返回32，对于64位，它将返回64

import struct
print(struct.calcsize("P") * 8)

C:\Users\xyz>python

Python 2.7.6 (default, Nov XY ..., 19:24:24) **[MSC v.1500 64 bit (AMD64)] on win
32**
Type "help", "copyright", "credits" or "license" for more information.
>>>

在CMD中点击python后

尝试使用ctypes来获取void指针的大小:

import ctypes
print ctypes.sizeof(ctypes.c_voidp)

32位是4位，64位是8位。

平台架构不是可靠的方法。 相反,我们:

$ arch -i386 /usr/local/bin/python2.7
Python 2.7.9 (v2.7.9:648dcafa7e5f, Dec 10 2014, 10:10:46)
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import platform, sys
>>> platform.architecture(), sys.maxsize
(('64bit', ''), 2147483647)
>>> ^D
$ arch -x86_64 /usr/local/bin/python2.7
Python 2.7.9 (v2.7.9:648dcafa7e5f, Dec 10 2014, 10:10:46)
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import platform, sys
>>> platform.architecture(), sys.maxsize
(('64bit', ''), 9223372036854775807)