Python如何获取系统大小端模式

1. 第一种方法导入sys模块；

>>> import sys >>> >>> sys.byteorder ‘little‘ >>>

2. 第二种方法，使用array模块，将整数用signed integer 4字节表示：

??? |????? Type code?? C Type???????????? Minimum size in bytes
??? |????? ‘b‘???????? signed integer???? 1
??? |????? ‘B‘???????? unsigned integer?? 1
??? |????? ‘u‘???????? Unicode character? 2 (see note)
??? |????? ‘h‘???????? signed integer???? 2
??? |????? ‘H‘???????? unsigned integer?? 2
??? |????? ‘i‘???????? signed integer???? 2
??? |????? ‘I‘???????? unsigned integer?? 2
??? |????? ‘l‘???????? signed integer???? 4
??? |????? ‘L‘???????? unsigned integer?? 4
??? |????? ‘q‘???????? signed integer???? 8 (see note)
??? |????? ‘Q‘???????? unsigned integer?? 8 (see note)
??? |????? ‘f‘???????? floating point???? 4
??? |????? ‘d‘???????? floating point???? 8

?

>>> import array >>> a = array.array(‘l‘,[1]) >>>
>>> bytes(a) b‘x01x00x00x00‘
>>>
>>> a = array.array(‘l‘,[255]) >>> bytes(a) b‘xffx00x00x00‘
>>>
>>>
>>> a = array.array(‘l‘,[65535]) >>>
>>> bytes(a) b‘xffxffx00x00‘
>>>
>>>

?

低位在低地址内保存，本机使用的是小端模式。