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小白学python第38天之序列类型相互转换

  • 2026-02-05 18:10:21
小白学python第38天之序列类型相互转换

1.14

序列类型相互转换

?

学前疑问

不知道有没有人留意到,在第35天的完成作业里,第32天的作业代码中,第19行跟第23行都有list(),有人想过这个代码是什么意思吗?

1

序列类型相互转换

(1)列表 → 元组

核心方法/函数:

tuple()

主要特点或注意事项:数据变为不可变,更安全。

# 1. 创建一个列表list1 = [102030]print("原始列表:", list1 )print("列表类型:"type(list1))# 2.使用tuple()函数将列表转换为元组tuple1 = tuple(list1)print("转换后的元组:", tuple1)print("元组类型:"type(tuple1))

(2)元组 → 列表

核心方法/函数:

list()

主要特点或注意事项:数据变为可变,可进行增删改。

# 1. 创建一个元组tuple1 = (10, 20, 30)print("原始元组:", tuple1)print("元组类型:"type(tuple1))# 2.使用list()函数将元组转换为列表list1 = list(tuple1)print("转换后的列表:", list1)print("列表类型:"type(list1))

(3)字符串 → 列表

核心方法/函数:

list()或split()

主要特点或注意事项:list()按字符分割;split()按分隔符分割。

# list()# 示例1:基本用法string1 = "hi"list1 = list(string1)print(list1)# 示例2:观察空格和标点符号的处理string2 = "Hello, World!"list2 = list(string2)print(list2)  
# split()# 示例1:使用默认分隔符(空格)string1 = "a b"list1 = string1.split() print(list1)# 示例2:使用自定义分隔符(例如逗号)string2 = "apple,banana,orange"list2 = string2.split(',')print(list2)# 示例3:限制分割次数(maxsplit参数)string3 = "one two three four"list3 = string3.split(' '2print(list3) 

(4)列表 → 字符串

核心方法/函数:

join()

主要特点或注意事项:列表元素必须全是字符串。

char_list = ['h''i']# 示例1:无分隔符result1 = ''.join(char_list)print("无分隔符:", result1)# 示例2:使用连字符作为分隔符result2 = '-'.join(char_list)print("连字符分隔:", result2)# 示例3:使用空格作为分隔符result3 = ''.join(char_list)print("空格分隔:", result3) # 示例4:使用多个字符作为复杂分隔符result4 = ' * '.join(char_list)print("复杂分隔符:", result4)

(5)字符串 ↔ 元组

核心方法/函数:

tuple()和join()

主要特点或注意事项:与列表类似,注意 join()的使用条件。

# 字符串 --> 元组# 示例1:转换包含空格和标点的字符串text = "Oh no!"text_tuple = tuple(text)print(text_tuple)  # 示例2:转换数字字符串number_str = "123"number_tuple = tuple(number_str)print(number_tuple)  # 示例3:单字符字符串single_char_tuple = tuple("A")print(single_char_tuple)  # 示例4:空字符串empty_tuple = tuple("")print(empty_tuple) 
# 字符串 <-- 元组元组char_tuple = ('h''i')# 示例1:无连接符result1 = ''.join(char_tuple)print("无连接符:", result1)# 示例2:使用连字符result2 = '-'.join(char_tuple)print("连字符连接:", result2)# 示例3:使用空格result3 = ''.join(char_tuple)print("空格连接:", result3)# 示例4:使用多个字符result4 = ' -> '.join(char_tuple)print("箭头连接:", result4)

(6)列表 → 集合

核心方法/函数:

set()

主要特点或注意事项:自动去重,但丢失元素顺序。

# 1. 定义一个包含重复元素的列表original_list = [1223]print("原始列表:", original_list)print("原始列表类型:"type(original_list))# 2. 使用set()函数将列表转换为集合result_set = set(original_list)print("转换后的集合:", result_set)print("转换后的类型:"type(result_set))# 3. 验证转换结果print("列表中元素个数 (含重复):"len(original_list))print("集合中元素个数 (去重后):"len(result_set))

(7)集合 → 列表/元组

核心方法/函数:

list()/tuple()

主要特点或注意事项:顺序可能不确定。

# 1. 创建一个集合my_set = {1, 3, 2}  # 集合是无序的,打印顺序可能不同print("原始集合:", my_set)print("集合类型:"type(my_set))# 2. 使用list()函数将集合转换为列表my_list = list(my_set)print("转换后的列表:", my_list)  # 转换后的列表顺序可能与集合打印顺序一致,但这是不确定的print("列表类型:"type(my_list))
# 定义一个集合my_set = {52821}  # 集合会自动去重,所以只有一个‘2print("原始集合:", my_set)  # 输出顺序不确定# 使用tuple()函数将集合转换为元组my_tuple = tuple(my_set)print("转换后的元组:", my_tuple)

(8)字典 → 列表/元组

核心方法/函数:

list()/tuple()配合.keys(),.values(),.items()

主要特点或注意事项:可灵活转换键、值或键值对。

# 字典 --> 列表# 1. 创建一个字典my_dict = {'a': 1}print("原始字典:", my_dict)print("原始字典类型:"type(my_dict))# 2. 使用 .keys() 方法获取键的视图对象keys_view = my_dict.keys()print("keys() 返回的视图对象:", keys_view)print("视图对象类型:"type(keys_view))# 3. 使用 list() 函数将视图对象转换为列表keys_list = list(my_dict.keys()) # 或者直接写 list(my_dict)print("转换后的键列表:", keys_list)print("键列表类型:"type(keys_list))
# 字典 --> 元组# 创建一个示例字典my_dict = {'name''Alice''age'25'city''New York'}print("原始字典:", my_dict)# 1. 将字典的键转换为元组keys_tuple = tuple(my_dict)print("字典的键组成的元组:", keys_tuple) # 2. 将字典的键值对转换为元组items_tuple = tuple(my_dict.items())print("键值对组成的元组:", items_tuple) 

(9)两个列表 → 字典

核心方法/函数:

dict()和zip()

主要特点或注意事项:将两个列表对应元素打包成键值对。

# zip()# 1. 定义两个列表,一个作为键(key),一个作为值(value)keys_list = ['a''b']values_list = [12]print("键列表:", keys_list)print("值列表:", values_list)# 2. 使用 zip() 函数将两个列表对应位置的元素打包成元组,生成一个 zip 对象zipped_pairs = zip(keys_list, values_list)print("zip() 后的对象:", zipped_pairs)print("转换为列表查看:"list(zipped_pairs))# 重要:zip 对象是迭代器,上一行已遍历完,这里需要重新创建zipped_pairs = zip(keys_list, values_list)# 3. 使用 dict() 函数直接将 zip 对象转换为字典result_dict = dict(zipped_pairs)print("最终生成的字典:", result_dict)

今日学习完毕,课后作业:

有一段文本"apple banana orange apple banana apple",请按照以下要求进行操作:

1、按空格分割字符串,得到单词列表;

2、去重,得到不重复的单词集合;

3、统计原始文本中每个单词出现的次数;

4、将第3步的结果转换为元组列表。

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  1. CONNECT:[ UseTime:0.000606s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000897s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000436s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000463s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000484s ]
  6. SELECT * FROM `set` [ RunTime:0.000200s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000517s ]
  8. SELECT * FROM `article` WHERE `id` = 463552 LIMIT 1 [ RunTime:0.004045s ]
  9. UPDATE `article` SET `lasttime` = 1770539596 WHERE `id` = 463552 [ RunTime:0.007116s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000591s ]
  11. SELECT * FROM `article` WHERE `id` < 463552 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000770s ]
  12. SELECT * FROM `article` WHERE `id` > 463552 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000379s ]
  13. SELECT * FROM `article` WHERE `id` < 463552 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002520s ]
  14. SELECT * FROM `article` WHERE `id` < 463552 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002829s ]
  15. SELECT * FROM `article` WHERE `id` < 463552 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.012067s ]
0.100255s