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我把 Python 中 zip() 函数玩出花了!

  • 2026-02-05 00:43:45
我把 Python 中 zip() 函数玩出花了!

标题:我把 Python 中 zip() 函数玩出花了!

昨天晚上十一点多,我在公司楼下等外卖,顺手改一个小脚本,本来就是把两个列表拼在一起打印一下,结果一顿操作写了七八行 for 循环,整个人都烦了。抬头一想:我咋不用 zip() 呢?一行就能搞定的事情,被我写成屎山……

所以就想好好把这个小函数从头到尾捋一遍,顺便把我自己踩过的几个坑也说一下。

最常见的场景就是两个列表“结对儿”遍历,比如名字+分数:

names = ["张三""李四""王五"]scores = [908560]for name, score in zip(names, scores):    print(name, "考了", score)

输出:

张三 考了 90李四 考了 85王五 考了 60

感觉就像给两个列表牵个手,一路一起走。

有时候我还会直接把它变成列表,方便调试看结果:

pairs = list(zip(names, scores))print(pairs)   # [('张三', 90), ('李四', 85), ('王五', 60)]

这里有两个小点,很容易被忽略掉:

z = zip(names, scores)print(list(z))   # 第一次正常print(list(z))   # 第二次就是 []

在 Python3 里,zip() 返回的是迭代器,用一次少一次,用完就没了。调试的时候一不小心就会出现“诶,怎么第二次打印就没东西了”的那种迷惑瞬间。

把数据“拆开”的时候它也能反着来一下

有一次我在处理坐标点 (x, y) 列表,要分别拿到所有 x 和所有 y,本来准备写个 for 循环,后来想到 zip(*iterable) 这个骚操作。

points = [(12), (34), (56)]xs, ys = zip(*points)print(xs)  # (1, 3, 5)print(ys)  # (2, 4, 6)

* 在这儿的意思就是“把列表拆开,按参数一个个传给 zip”,相当于:

zip((12), (34), (56))

再来一个稍微“算法一点”的例子:矩阵转置,经常在做题或者处理数据的时候会遇到。

matrix = [    [123],    [456],    [789]]transposed = list(zip(*matrix))print(transposed)# [(1, 4, 7), (2, 5, 8), (3, 6, 9)]

就这几行,直接把行列互换了,以前我真的是 for 里套 for 在那瞎写,写完还容易下标写错。

把两个列表变成字典,做配置特别顺手

像搞配置的时候,经常有“字段名列表”和“值列表”,用 zip() 拼一下,秒变 dict:

keys = ["name""age""city"]values = ["dongge"18"Shanghai"]data = dict(zip(keys, values))print(data)# {'name': 'dongge', 'age': 18, 'city': 'Shanghai'}

甚至读取 CSV 的时候,也可以这么用:第一行当表头,后面每一行跟表头 zip 一下,是不是就变成一条条记录了。

header = ["id""name""score"]row = ["001""小明""95"]record = dict(zip(header, row))print(record)# {'id': '001', 'name': '小明', 'score': '95'}

这招在写小工具脚本的时候真的很香,尤其是你不想上 pandas 的时候。

和排序、下标这些东西搭一搭配,更好玩

有时候要“按分数排序,然后带着名字一起排”,这个场景特别典型。最蠢的写法是两个列表拆来拆去,其实一行搞定:

names = ["张三""李四""王五"]scores = [908560]# 按分数从高到低排sorted_pairs = sorted(zip(scores, names), reverse=True)for score, name in sorted_pairs:    print(name, score)

顺带你还可以把排完序的结果再“拆开”:

sorted_scores, sorted_names = zip(*sorted_pairs)print(sorted_scores)  # (90, 85, 60)print(sorted_names)   # ('张三', '李四', '王五')

有时候我还会把 enumerate 和 zip 混着用,处理两个列表的时候还能顺便拿下标:

a = [102030]b = [123]for idx, (x, y) in enumerate(zip(a, b)):    print(idx, x, y, x + y)

这种写法在刷题的时候非常顺手,既能看下标,又能同时拿到两个列表对应位置的值,代码逻辑也比较清楚。

列表长短不一样怎么办?再上个“加长版”

zip() 有个小小的坑:它会按最短的那个序列截断,多余的直接不要了:

a = [1234]b = [1020]print(list(zip(a, b)))  # [(1, 10), (2, 20)]

剩下的 3, 4 就没了。有时候业务上你是允许“不对齐的”,只是想没值的时候补个默认值,这时候可以用 itertools.zip_longest

from itertools import zip_longesta = [1234]b = [1020]for x, y in zip_longest(a, b, fillvalue=0):    print(x, y)

输出:

1 102 203 04 0

这个在做对账、对比两个列表差异的时候还挺常用的,至少不会默默“吞”掉后面的数据。

一个是前面说的:zip() 在 Python3 里返回的是迭代器,用一次少一次,调试的时候别一口气 print(list(z)) 打三遍,然后问自己“为啥后面都是空的”。

另一个就是长度不一样时,它按最短的截断这一点,做算法题还好,写业务代码如果不注意,真的可能默默丢数据,而且完全没异常、没错,最难发现那种。

反正我现在写 Python,只要脑子里出现“两堆数据要一一配对”,下意识就会先想一眼 zip() 能不能帮忙。你可以下次写脚本的时候试试,把几个 for 循环删掉,用它重写一遍,说不定会有点小爽感。

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  1. CONNECT:[ UseTime:0.000874s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000842s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.100766s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.100754s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000785s ]
  6. SELECT * FROM `set` [ RunTime:0.100654s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000925s ]
  8. SELECT * FROM `article` WHERE `id` = 471750 LIMIT 1 [ RunTime:0.100878s ]
  9. UPDATE `article` SET `lasttime` = 1770460334 WHERE `id` = 471750 [ RunTime:1.758471s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.030414s ]
  11. SELECT * FROM `article` WHERE `id` < 471750 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000784s ]
  12. SELECT * FROM `article` WHERE `id` > 471750 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.042788s ]
  13. SELECT * FROM `article` WHERE `id` < 471750 ORDER BY `id` DESC LIMIT 10 [ RunTime:3.159358s ]
  14. SELECT * FROM `article` WHERE `id` < 471750 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.127361s ]
  15. SELECT * FROM `article` WHERE `id` < 471750 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.119397s ]
5.803797s