March 2022
Intermediate to advanced
522 pages
13h 52m
Chinese
Content preview from Python语言及其应用（第2版）
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数据处理
｜
209
表12-6：位级整数运算符
运算符 描述 示例 十进制结果 二进制结果
&
与
x & y 1 0b0001
|
或
x | y 5 0b0101
^
异或
x ^ y 4 0b0100
~
取反
~x -6
取决于
int
类型大小
<<
左移
x << 1 10 0b1010
>>
右移
x >> 1 2 0b0010
这些运算符类似于第
8
章中的集合运算符。
&
运算符可以返回两个操作数中相同的位。
|
可以返回两个操作数中为
1
的位。
^
可以返回仅在一个操作数中为
1
的位。
~
可以将单个
操作数的所有位取反，这同时也颠倒了操作数的符号，因为现代计算机使用的是
2
的补码
（
two
’
s complement
）
，整数的最高位代表其符号（
0
为正，
1
为负）。
<<
和
>>
运算符操作数
可以向左或向右移动指定位数，左移一位相当于将操作数乘以
2
，右移一位相当于将操作
数除以
2
。
12.4
珠宝类比
Unicode
字符串就像一只迷人的手镯，字节则像是一串串的珠子。
12.5
后续内容
第
13
章会介绍另一个实用主题：如何处理日期和时间。
12.6
练习
1.
创建
Unicode
字符串
mystery
，为其赋值
'\U0001f984'
。打印出
mystery
及其
Unicode
名称。
2.
使用
UTF-8
，将
mytery
编码后存入
bytes
类型的变量
pop_bytes
。打印出
pop_bytes
。
3.
使用
UTF-8
将
pop_bytes
解码后存入字符串变量
pop_string
。打印出
pop_string
。
pop_string
是否等于
mystery
？
4.
在处理文本时 ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.