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Python 元组:不可变序列与复合数据结构精讲

  • 2026-06-30 02:21:53
Python 元组:不可变序列与复合数据结构精讲

Python 元组:不可变序列与复合数据结构精讲|《Think Python》第11章

11. 元组

本章介绍 Python 内置类型元组(tuple),讲解元组的定义、不可变性、元组赋值、函数多返回值、参数打包与解包、zip 与 enumerate 用法、字典反转等核心内容。元组可与列表、字典配合使用,是实现高效算法的重要数据结构。

11.1 元组类似于列表

元组是值的序列,可以包含任意类型,用整数索引,和列表非常相似。重要区别是元组不可变

# 用逗号分隔创建元组t = 'l''u''p''i''n'type(t)

运行结果:

tuple
# 常用括号包裹元组t = ('l''u''p''i''n')type(t)

运行结果:

tuple
# 单元素元组必须加末尾逗号t1 = 'p',type(t1)

运行结果:

tuple
# 使用 tuple() 函数创建空元组t = tuple()t

运行结果:

()
# 从序列创建元组t = tuple('lupin')t

运行结果:

('l', 'u', 'p', 'i', 'n')
# 索引访问元素t[0]

运行结果:

'l'
# 切片操作t[1:3]

运行结果:

('u', 'p')

11.2 元组是不可变的

元组不支持修改元素,因此没有 append、remove 等方法。由于不可变,元组是可哈希的,可以作为字典的键。

t = ('l''u''p''i''n')# 尝试修改元组元素会报错# t[0] = 'L'

运行结果:

TypeError: 'tuple' object does not support item assignment
# 元组可以作为字典的键d = {}d[(12)] = 3d[(34)] = 7d[(12)]

运行结果:

3

11.3 元组赋值

赋值语句左侧可以使用元组,实现同时对多个变量赋值。右侧可以是任何序列类型。

# 同时给 a 和 b 赋值a, b = 12a, b

运行结果:

(1, 2)
# 拆分邮箱地址email = 'monty@python.org'username, domain = email.split('@')username, domain

运行结果:

('monty', 'python.org')
# 直接交换两个变量,无需临时变量a, b = b, a
# 遍历字典时直接解包键值对d = {'one'1'two'2}for key, value in d.items():print(key, '->', value)

运行结果:

one -> 1two -> 2

11.4 元组作为返回值

函数严格来说只能返回一个值,但返回元组可以实现返回多个值的效果。

# divmod 一次性返回商和余数divmod(73)

运行结果:

(2, 1)
# 用元组赋值接收结果quotient, remainder = divmod(73)quotient

运行结果:

2
# 自定义函数返回最小值和最大值组成的元组defmin_max(t):returnmin(t), max(t)low, high = min_max([2413])low, high

运行结果:

(1, 4)

11.5 参数打包与解包

以 * 开头的参数会将多个参数打包为元组;调用时在序列前加 * 可将其解包为多个参数。

# 接收任意数量的参数,打包为元组 argsdefmean(*args):returnsum(args) / len(args)mean(123)

运行结果:

2.0
# 解包元组作为函数参数t = (73)divmod(*t)

运行结果:

(2, 1)
# 去掉最高最低分求平均分deftrimmed_mean(*args):    low, high = min_max(args)    trimmed = list(args)    trimmed.remove(low)    trimmed.remove(high)return mean(*trimmed)trimmed_mean(12310)

运行结果:

2.5

11.6 zip 与 enumerate

zip

将多个序列按位置配对,返回由元组组成的迭代对象。

scores1 = [1245152]scores2 = [5522523]# 配对遍历for team1, team2 inzip(scores1, scores2):print(team1, team2)

运行结果:

1 52 54 25 21 55 22 3
# 用 zip 快速创建字典letters = 'abcdefghijklmnopqrstuvwxyz'numbers = range(len(letters))letter_map = dict(zip(letters, numbers))letter_map['a'], letter_map['z']

运行结果:

(0, 25)

enumerate

同时遍历序列的索引和元素。

for index, element inenumerate('abc'):print(index, element)

运行结果:

0 a1 b2 c

11.7 比较与排序

元组按元素依次比较,可用于排序。sorted 可以指定 key 函数。

(012) < (034)

运行结果:

True
# 统计字符出现次数defvalue_counts(string):    counter = {}for letter in string:if letter notin counter:            counter[letter] = 1else:            counter[letter] += 1return countercounter = value_counts('banana')items = counter.items()

运行结果:

dict_items([('b', 1), ('a', 3), ('n', 2)])
# 按元组的第二个元素排序defsecond_element(t):return t[1]sorted_items = sorted(items, key=second_element)sorted_items

运行结果:

[('b', 1), ('n', 2), ('a', 3)]
# 直接获取计数最大的项max(items, key=second_element)

运行结果:

('a', 3)

11.8 反转字典

字典的值可能重复,因此反转字典需要将值作为新键,对应原键组成的列表作为新值。

definvert_dict(d):    new = {}for key, value in d.items():if value notin new:            new[value] = [key]else:            new[value].append(key)return newd = value_counts('parrot')invert_dict(d)

运行结果:

{1: ['p', 'a', 'o', 't'], 2: ['r']}

11.9 调试

列表、字典、元组构成复合数据结构,容易出现结构错误。可以使用结构诊断工具查看数据形状。

# 示例:查看数据结构形状# from structshape import structshape# structshape([(1, 'a'), (2, 'b')])

11.10 术语表

英文
中文
解释
tuple
元组
不可变有序序列
immutable
不可变
无法修改元素
tuple assignment
元组赋值
同时给多个变量赋值
pack
打包
多个参数合并为元组
unpack
解包
序列拆分为多个参数
zip
配对
多个序列按位置配对
enumerate
枚举
遍历索引与元素
sort key
排序键
用于排序的依据
invert dict
反转字典
值映射到键列表
data structure
数据结构
数据组织方式

11.11 练习

11.11.2 包含可变元素的元组

list0 = [123]list1 = [45]t = (list0, list1)# 修改元组内的列表t[1].append(6)t

运行结果:

([1, 2, 3], [4, 5, 6])
# 包含列表的元组不可哈希,不能作为字典键# d = {t: '内容'}

运行结果:

TypeError: unhashable type: 'list'

11.11.3 凯撒密码

defshift_word(word, n):    letters = 'abcdefghijklmnopqrstuvwxyz'    letter_map = dict(zip(letters, range(len(letters))))    result = []for c in word:if c in letter_map:            idx = letter_map[c]            new_idx = (idx + n) % 26            result.append(letters[new_idx])else:            result.append(c)return''.join(result)shift_word('cheer'7)

运行结果:

jolly

11.11.4 按字母频率降序输出

defmost_frequent_letters(s):    counter = value_counts(s)    items = sorted(counter.items(), key=lambda x: x[1], reverse=True)for char, count in items:print(char, count)

11.11.5 查找变位词组

deffind_anagrams(word_list):    d = {}for word in word_list:        key = ''.join(sorted(word))if key notin d:            d[key] = [word]else:            d[key].append(word)return [group for group in d.values() iflen(group) > 1]

11.11.6 单词距离

defword_distance(w1, w2):    count = 0for c1, c2 inzip(w1, w2):if c1 != c2:            count += 1return count

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  1. CONNECT:[ UseTime:0.000408s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000621s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000599s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.003220s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000517s ]
  6. SELECT * FROM `set` [ RunTime:0.003194s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000652s ]
  8. SELECT * FROM `article` WHERE `id` = 489611 LIMIT 1 [ RunTime:0.007822s ]
  9. UPDATE `article` SET `lasttime` = 1783058528 WHERE `id` = 489611 [ RunTime:0.005452s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.010418s ]
  11. SELECT * FROM `article` WHERE `id` < 489611 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.006126s ]
  12. SELECT * FROM `article` WHERE `id` > 489611 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.005022s ]
  13. SELECT * FROM `article` WHERE `id` < 489611 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.032596s ]
  14. SELECT * FROM `article` WHERE `id` < 489611 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.022442s ]
  15. SELECT * FROM `article` WHERE `id` < 489611 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.013016s ]
0.197321s