April 2023
Intermediate to advanced
769 pages
25h 16m
Chinese
Content preview from 流畅的Python（第2版）
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482
｜
第
17
章
>>> for row in rows: print(row)
...
('A', 0, 'A', 0)
('A', 0, 'A', 1)
('A', 0, 'B', 0)
('A', 0, 'B', 1)
('A', 1, 'A', 0)
('A', 1, 'A', 1)
('A', 1, 'B', 0)
('A', 1, 'B', 1)
('B', 0, 'A', 0)
('B', 0, 'A', 1)
('B', 0, 'B', 0)
('B', 0, 'B', 1)
('B', 1, 'A', 0)
('B', 1, 'A', 1)
('B', 1, 'B', 0)
('B', 1, 'B', 1)
➊
3
个字符的字符串与
2
个整数的区间得到的笛卡儿积是
6
个元组（因为
3 * 2
等于
6
）。
➋
2
张牌（
'AK'
）与
4
种花色得到的笛卡儿积是
8
个元组。
➌
传入一个可迭代对象，
product
函数产出一系列一元组——不是特别有用。
➍
repeat=N
关键字参数告诉
product
函数重复
N
次处理输入的各个可迭代对象。
有些生成器函数会从一项中产出多个值，从而扩充输入的可迭代对象，如表
17-4
所示。
表 17-4：把输入的各项扩充成多个输出项的生成器函数
模 块 函 数 说 明
itertools combinations(it, out_len)
把
it
产出的
out_len
个项组合在一起，
然后产出
itertools combinations_with_replacement(it, ...
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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.