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搞懂Python中可迭代对象是否相等,只需这几个技巧

  • 2026-02-05 00:59:29
搞懂Python中可迭代对象是否相等,只需这几个技巧

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在 Python 中,如何检查两个可迭代对象是否相等?这篇文章就来聊聊这些细节,用通俗的方式帮你搞清楚:在 Python 里,“相等”到底意味着什么。

简单的相等检查

如果我们有两个列表,并且我们想知道这两个列表中的项目是否相同,我们可以使用相等运算符==:

>>> lines1 = ["Grains", "Kindred", "Zia"]>>> lines2 = ["Grains", "Kindred", "Zia"]>>> lines1 == lines2True

同样的也适用于比较 Tuples:

>>> p = (3, 4, 8)>>> q = (3, 5, 7)>>> p == qFalse

但是,如果我们想比较一个列表和一个元组呢?

我们不能对此使用简单的相等性检查:

>>> lines1 = ["Grains", "Kindred", "Zia"]>>> lines2 = ("Grains", "Kindred", "Zia")>>> lines1 == lines2False

比较不同类型的可迭代对象

要将列表中的项与 Tuples 中的项进行比较,我们可以将列表转换为 Tuples 或将 Tuples 转换为 List,然后检查是否相等:

>>> lines1 = ["Grains", "Kindred", "Zia"]>>> lines2 = ("Grains", "Kindred", "Zia")>>> lines1 == list(lines2)True

这种方法也适用于比较任何其他类型的 iterable。

例如,我们这里有两个对象:itertools.chain

>>> file1a = open("year1-first.txt")>>> file1b = open("year1-second.txt")>>> file2a = open("year2-first.txt")>>> file2b = open("year2-second.txt")>>> from itertools import chain>>> year1 = chain(file1a, file1b)>>> year2 = chain(file2a, file2b)

这些对象是可迭代对象,但它们也是迭代器,相等运算符不能很好地与迭代器配合使用。

如果我们遍历这两个对象,我们会看到它们中包含相同的项目.

>>> year1 == year2False

因此,我们可以在比较它们之前将它们中的每一个转换为一个列表:

>>> list(year1) == list(year2)True

这样就可以正确对比。

检查大型可迭代对象之间的相等性

在我们比较之前将两个可迭代对象转换为列表或元组,这样确实可以, 但是,如果我们比较两个非常大的可迭代对象,并且这些可迭代对象通常在它们不同的前几个元素上有所不同,那么这种类型的比较将花费更多的内存和更多的时间。

例如,也许我们正在比较两个文件,这两个文件通常要么完全相同,要么在前几行中不同。

我们可以一次性将整个文件全部读入内存,然后对它们中的每一个进行比较:

>>> with open("results1.csv") as file1, open("results2.csv") as file2:       same = (file1.read() == file2.read())

这种检查不匹配值、设置布尔值和打破循环的样式实际上是 Python 的 any 和 all 函数旨在处理的。因此,我们可以通过使用生成器表达式和内置函数来做同样的事情

>>> with open("results1.csv") as file1, open("results2.csv") as file2:      same = all(          line1 == line2          for line1, line2 in zip(file1, file2, strict=True)      )

无论哪种方式,我们都会逐行遍历每个文件,比较每一行以确保它们相等,然后在完成比较后丢弃前面的行,并在发现不相等的行后立即停止。

检查是否接近相等

我们也可以用于检查是否接近相等。

例如,也许我们正在读取 2 个 CSV 文件并进行比较,但我们只关心每行的第一列是否与文件中匹配:

>>> import csv  with open("results1.csv") as file1, open("results2.csv") as file2:      reader1, reader2 = csv.reader(file1), csv.reader(file2)      same = all(          row1[0] == row2[0]          for row1, row2 in zip(reader1, reader2, strict=True)      )

如果你不关心你正在比较的可迭代对象的类型,并且只关心它们是否具有相同的 Sequences 相同的项目,那么这种比较风格效果很好, 因此,如果我们想检查一个列表和一个元组(或任何可迭代对象)是否具有相同的项目,我们可以使用这种方法.

比较可迭代对象时忽略顺序

到目前为止,所有这些方法都假设两个可迭代对象的顺序很重要, 如果你需要比较两个可迭代对象,而忽略它们项目的顺序怎么办?

>>> members = ["Gregory", "Barry", "Pablo", "Emily", "Donghee"]>>> speakers = ["Barry", "Donghee", "Emily", "Gregory", "Pablo"]

好吧,如果项目是字符串、数字或其他可哈希对象,那么你可以将两个可迭代对象放在集合中,并检查这些集合是否相等:

>>> set(members) == set(speakers)True

如果你的可迭代对象可能会重复项目,并且重复次数很重要,那么你可以使用集合计数器collections.Counter:

>>> hand1 = ["AS", "AS", "KS", "KH", "QC"]>>> hand2 = ["AS", "KH", "AS", "QC", "KS"]>>> from collections import Counter>>> Counter(hand1) == Counter(hand2)True

也可以使用sorted功能:

>>> sorted(hand1) == sorted(hand2)True

但是排序的过程比向对象添加项目要慢,因此我更喜欢使用而不是排序.

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  1. CONNECT:[ UseTime:0.000641s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000818s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000336s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000261s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000501s ]
  6. SELECT * FROM `set` [ RunTime:0.000193s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000639s ]
  8. SELECT * FROM `article` WHERE `id` = 472532 LIMIT 1 [ RunTime:0.000456s ]
  9. UPDATE `article` SET `lasttime` = 1770465822 WHERE `id` = 472532 [ RunTime:0.009347s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000462s ]
  11. SELECT * FROM `article` WHERE `id` < 472532 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000561s ]
  12. SELECT * FROM `article` WHERE `id` > 472532 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000363s ]
  13. SELECT * FROM `article` WHERE `id` < 472532 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003452s ]
  14. SELECT * FROM `article` WHERE `id` < 472532 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000637s ]
  15. SELECT * FROM `article` WHERE `id` < 472532 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004752s ]
0.093276s