获取Python中整数所需的字节大小

2022-01-17 00:00:00 python numbers byte integer size

问题描述

如何找出某个整数占用的存储字节数?

How can I find out the number of Bytes a certain integer number takes up to store?

例如对于

  • 十六进制x00 - xff(或十进制0 - 255 = 二进制0000 0000 - 1111 1111) 我希望得到 1(字节),
  • 十六进制x100 - xffff(或十进制256 - 65535 = 二进制0000 00010000 0000 - 1111 1111 1111 1111) 会给我 2(字节)
  • hexadecimal x00 - xff (or decimal 0 - 255 = binary 0000 0000 - 1111 1111) I'm looking to get 1 (Byte),
  • hexadecimal x100 - xffff (or decimal 256 - 65535 = binary 0000 0001 0000 0000 - 1111 1111 1111 1111) would give me 2 (Bytes)

等等.

输入十六进制或十进制格式的任何线索?

Any clue for hexadecimal or decimal format as the input?


解决方案

你可以使用简单的数学:

You can use simple math:

>>> from math import log
>>> def bytes_needed(n):
...     if n == 0:
...         return 1
...     return int(log(n, 256)) + 1
...
>>> bytes_needed(0x01)
1
>>> bytes_needed(0x100)
2
>>> bytes_needed(0x10000)
3

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