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Python快速入门学习笔记十二:数据容器 通用操作与总结

  • 2026-06-29 17:46:03
Python快速入门学习笔记十二:数据容器 通用操作与总结

Python入门第十二课,主要是对数据容器的做个总结,以及相互转换的通用操作函数的学习。

  • 通用内置函数
  • list函数
  • tuple函数
  • set函数
  • str函数
  • dict函数
  • 成员运算符 in / not in
  • 数据容器总结

通用内置函数

在之前数据容器系列文章中已经介绍过下面图中常用函数,不过还是要根据实际应用场景选择合适的函数使用:

下面继续介绍一些数据容器的通用操作,主要是类型之间的相互转换。

list函数

list函数有如下两个作用:

  • 定义空列表
res5 = list()print(type(res5), res5) # <class 'list'> []
  • 将可迭代对象转为列表
data_range = range(5# <class 'range'> range(0, 5)data_str = '欢迎大家都来学Python'# <class 'str'>data_set = {1020304050# <class 'set'>data_dict = { '张三'75'李四'60'王五'85 } # <class 'dict'>res1 = list(data_range)print(type(res1), res1) # <class 'list'> [0, 1, 2, 3, 4]res2 = list(data_str)print(type(res2), res2) # <class 'list'> ['欢', '迎', '大', '家', '都', '来', '学', 'P', 'y', 't', 'h', 'o', 'n']res3 = list(data_set)print(type(res3), res3) # <class 'list'> [50, 20, 40, 10, 30]res4 = list(data_dict.items())print(type(res4), res4) # <class 'list'> [('张三', 75), ('李四', 60), ('王五', 85)]

tuple函数

tuple函数有如下两个作用:

  • 定义空元组
res5 = tuple()print(type(res5), res5) # <class 'tuple'> ()
  • 将可迭代对象转为元组
data_range = range(5)  # <class 'range'> range(0, 5)data_str = '欢迎大家都来学Python'# <class 'str'>data_set = {1020304050}  # <class 'set'>data_dict = {'张三'75'李四'60'王五'85}  # <class 'dict'>res1 = tuple(data_range)print(type(res1), res1) # <class 'tuple'> (0, 1, 2, 3, 4)res2 = tuple(data_str)print(type(res2), res2) # <class 'tuple'> ('欢', '迎', '大', '家', '都', '来', '学', 'P', 'y', 't', 'h', 'o', 'n')res3 = tuple(data_set)print(type(res3), res3) # <class 'tuple'> (50, 20, 40, 10, 30)res4 = tuple(data_dict)print(type(res4), res4) # <class 'tuple'> ('张三', '李四', '王五')

set函数

set函数有如下两个作用:

  • 定义空集合
res5 = set()print(type(res5), res5) # <class 'set'> set()
  • 将可迭代对象转换为集合
data_range = range(5)  # <class 'range'> range(0, 5)data_str = '欢迎大家都来学Python'# <class 'str'>data_list = [1020304050]  # <class 'list'>data_dict = {'张三'75'李四'60'王五'85}  # <class 'dict'>res1 = set(data_range)print(type(res1), res1) # <class 'set'> {0, 1, 2, 3, 4}res2 = set(data_str)print(type(res2), res2) # <class 'set'> {'n', 't', '都', '迎', '学', '欢', 'P', 'o', '大', '来', 'y', '家', 'h'}res3 = set(data_list)print(type(res3), res3) # <class 'set'> {40, 10, 50, 20, 30}res4 = set(data_dict)print(type(res4), res4) # <class 'set'> {'王五', '李四', '张三'}

str函数

str函数有如下两个作用:

  • 定义空字符串
res8 = str()print(type(res8), res8) # <class 'str'>
  • 将可迭代对象转换为字符串
data_range = range(5)  # <class 'range'> range(0, 5)data_list = [1020304050]  # <class 'list'>data_set = {1020304050# <class 'set'>data_dict = { '张三'75'李四'60'王五'85 } # <class 'dict'>data_bool = False# <class 'bool'>data_none = None# <class 'NoneType'>data_int = 100# <class 'int'>res1 = str(data_range)print(type(res1), res1) # <class 'str'> range(0, 5)res2 = str(data_list)print(type(res2), res2) # <class 'str'> [10, 20, 30, 40, 50]res3 = str(data_set)print(type(res3), res3) # <class 'str'> {50, 20, 40, 10, 30}res4 = str(data_dict)print(type(res4), res4) #<class 'str'> {'张三': 75, '李四': 60, '王五': 85}res5 = str(data_bool)print(type(res5), res5) # <class 'str'> Falseres6 = str(data_none)print(type(res6), res6) # <class 'str'> Noneres7 = str(data_int)print(type(res7), res7) # <class 'str'> 100

dict函数

dict函数有如下两个作用:

  • 定义空字典
res5 = dict()print(type(res5), res5) # <class 'dict'> {}
  • 将可迭代对象转换为字典(注意:交给dict函数的内容必须是键值对才可以,否则就会报错)
data1 = {'张三'75'李四'60'王五':85# <class 'dict'>data2 = [('张三'75), ('李四'60), ('王五'85)] # <class 'list'>data3 = (('张三'75), ('李四'60), ('王五'85)) # <class 'tuple'>data4 = {('张三'75), ('李四'60), ('王五'85)} # <class 'set'>res1 = dict(data1)print(type(res1), res1) # <class 'dict'> {'张三': 75, '李四': 60, '王五': 85}res2 = dict(data2)print(type(res2), res2) # <class 'dict'> {'张三': 75, '李四': 60, '王五': 85}res3 = dict(data3)print(type(res3), res3) # <class 'dict'> {'张三': 75, '李四': 60, '王五': 85}res4 = dict(data4)print(type(res4), res4) # <class 'dict'> {'李四': 60, '张三': 75, '王五': 85}

成员运算符 in / not in

所有数据容器都支持成员运算符in / not in,它的作用是:判断某个元素是否在于容器中。

data_list = [1020304050]  # <class 'list'>data_tuple = (1020304050)  # <class 'tuple'>data_set = {1020304050}  # <class 'set'>data_dict = {'张三'75'李四'60'王五'85}  # <class 'dict'>data_str = '欢迎大家都来学Python'# <class 'str'>print('100'notin data_list) # Trueprint('100'notin data_tuple) # Trueprint('100'notin data_set) # Trueprint('赵六'notin data_dict) # Trueprint('Python5'notin data_str) # Trueprint()print(10in data_list) # Trueprint(10in data_tuple) # Trueprint(10in data_set) # Trueprint('王五'in data_dict) # Trueprint('Py'in data_str) # True

数据容器总结

下面对数据容器从以下维度进行对比总结:

有序 VS 无序

  • 有序:列表(list)、元组(tuple)、字符串(str)——元素有顺序,可通过下标访问元素。
  • 无序:集合(set)、字典(dict)——元素没有固定位置,不能用下标访问。

是否可修改

  • 可变:列表(list)、集合(set)、字典(dict)——可以对内容进行增、删、改操作。
  • 不可变:元组(tuple)、字符串(str)——内容固定,创建后无法修改。

是否可重复

  • 可重复:列表(list)、元组(tuple)、字符串(str)
  • 不可重复:集合(set)、字典(dict,字典的key是唯一的,但value是可重复的)。

至此,数据容器就学习完了,收获满满,下一步开始学习面向对象。

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  1. CONNECT:[ UseTime:0.000658s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000835s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000361s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000407s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000530s ]
  6. SELECT * FROM `set` [ RunTime:0.000193s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000551s ]
  8. SELECT * FROM `article` WHERE `id` = 490941 LIMIT 1 [ RunTime:0.000495s ]
  9. UPDATE `article` SET `lasttime` = 1783118680 WHERE `id` = 490941 [ RunTime:0.015699s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.001878s ]
  11. SELECT * FROM `article` WHERE `id` < 490941 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000576s ]
  12. SELECT * FROM `article` WHERE `id` > 490941 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000395s ]
  13. SELECT * FROM `article` WHERE `id` < 490941 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002610s ]
  14. SELECT * FROM `article` WHERE `id` < 490941 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000704s ]
  15. SELECT * FROM `article` WHERE `id` < 490941 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000714s ]
0.097205s