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一次讲透Python字典和集合 第10节

  • 2026-08-21 01:31:36
一次讲透Python字典和集合 第10节
PYTHON · 零基础入门系列
字典和集合分不清?这一节一次讲透Python 基础 · 第十节 | 键值对、get()、遍历、集合去重与运算全掌握

💡 先问你一个问题

写了 info = {"name": "tom"} 之后,想取一个不存在的键 info["score"],程序直接报 KeyError?还有,字典和集合都用 {} 表示,到底怎么区分?这节课一次讲清,让你彻底告别踩坑。

🎯 本节目标

搞懂字典「键值对」结构,掌握 get() 安全取值、pop()/del 删除、keys()/values()/items() 遍历;理解集合自动去重,掌握交集 &、并集 |、差集 -

本节要点
知识点
说明
字典 dict
用 {} 表示,键值对结构
get()
安全获取字典中的值(键不存在不报错)
keys()/values()/items()
获取键、值、键值对
集合 set
用 {} 表示,自动去重
集合运算
交集 &、并集 |、差集 -
1字典(dict):用「键」查数据的结构

字典用 {} 表示,存的是键值对(key-value),通过「键」来访问「值」。它不像列表靠下标定位,而是像查字典一样按名字找。

python
info = {"name""tom""age"17"gender""male"}# 获取值:[] vs get()print(info["name"])           # tomprint(info.get("age"))        # 17print(info.get("score"))      # None(不存在不报错)print(info.get("score"0))   # 0(不存在返回默认值)

⚠️ 避坑:用 info["score"] 取不存在的键会报 KeyError。不确定键在不在时,优先用 get(),还能传第二个参数当默认值。

1.1字典添加与修改:直接赋值就行

字典加新键、改旧值,都是一句赋值搞定:键存在就改,不存在就添加。

python
# 添加新键值对info["score"] = 95print(info)  # {'name': 'tom', 'age': 17, 'gender': 'male', 'score': 95}# 修改已有键的值info["age"] = 18print(info)  # {'name': 'tom', 'age': 18, ...}
1.2字典删除:pop() 和 del

pop() 删除键的同时返回它的值del 则单纯删掉:

python
# pop() 删除并返回值gender = info.pop("gender")print(gender)  # maleprint(info)    # {'name': 'tom', 'age': 18, 'score': 95}# del 删除指定键del info["score"]print(info)  # {'name': 'tom', 'age': 18}
1.3遍历字典:keys() / values() / items()

三个方法各取所需:keys() 取键、values() 取值、items() 键值对一起拿。

python
# keys() 获取所有键print(info.keys())    # dict_keys(['name', 'age', 'gender'])for key in info.keys():print(key)# values() 获取所有值print(info.values())  # dict_values(['tom', 17, 'male'])for value in info.values():print(value)# items() 获取所有键值对for key, value in info.items():print(f"{key} → {value}")

▶ 运行结果

name → tomage → 17gender → male
2集合(set):自动去重的「袋子」

集合也用 {} 表示,存的是不重复的元素,会自动去重。注意:空集合必须用 set() 创建,写 {} 会被当成空字典!

python
# 创建集合numbers = {123321}print(numbers)                # {1, 2, 3}(自动去重)print(type(numbers))         # <class 'set'># 空集合empty_set = set()              # 空集合empty_dict = {}                 # 这是空字典,不是空集合!print(type(empty_set))       # <class 'set'>print(type(empty_dict))      # <class 'dict'>

📌 小技巧set() 和 {} 是最容易踩的坑——记住 「空字典用 {},空集合用 set()」

2.1添加元素 add():重复添加自动忽略
python
fruits = {"苹果""香蕉"}fruits.add("橘子")print(fruits)  # {'橘子', '苹果', '香蕉'}fruits.add("苹果")  # 重复添加不会报错,但不会增加print(fruits)      # {'橘子', '苹果', '香蕉'}(不变)
2.2删除元素:remove() vs discard()

两者都能删元素,区别在删除不存在的元素时remove() 会报错,discard() 静默忽略。

python
fruits = {"苹果""香蕉""橘子"}# remove() 删除指定元素(不存在会报错)fruits.remove("香蕉")print(fruits)  # {'橘子', '苹果'}# discard() 删除指定元素(不存在不会报错)fruits.discard("西瓜")  # 无此元素,但不会报错fruits.discard("苹果")print(fruits)  # {'橘子'}

⚠️ 避坑:不确定元素在不在,就用 discard(),避免程序因元素不存在而崩溃。

2.3集合运算:交集、并集、差集

集合支持数学里的集合运算,做「共同好友」「去重合并」等超方便:

python
a = {12345}b = {45678}# 交集 &:两个集合都有的元素print(a & b)     # {4, 5}# 并集 |:合并两个集合的所有元素(去重)print(a | b)     # {1, 2, 3, 4, 5, 6, 7, 8}# 差集 -:在 a 中但不在 b 中的元素print(a - b)     # {1, 2, 3}print(b - a)     # {8, 6, 7}

📌 集合的特点:① 自动去重 ② 元素无序 ③ 支持数学集合运算。常用于「去重」和「成员关系判断」。

本节小结

📝 一节课,收获这些

✔ 字典 {} 是键值对结构,通过「键」访问「值」

✔ get() 安全取值(不存在不报错、可设默认值),比 [] 更稳

✔ 删除用 pop()/del;遍历用 keys()/values()/items()

✔ 集合 set 自动去重,空集合用 set() 而非 {}

✔ 集合运算:交集 &、并集 |、差集 -

NEXT · 下一节预告

🚀 函数基础:把重复代码装进「函数」里,一次定义处处调用!

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  1. CONNECT:[ UseTime:0.001288s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001863s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000727s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000625s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001830s ]
  6. SELECT * FROM `set` [ RunTime:0.000547s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001415s ]
  8. SELECT * FROM `article` WHERE `id` = 511541 LIMIT 1 [ RunTime:0.001352s ]
  9. UPDATE `article` SET `lasttime` = 1787281905 WHERE `id` = 511541 [ RunTime:0.040253s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000801s ]
  11. SELECT * FROM `article` WHERE `id` < 511541 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001489s ]
  12. SELECT * FROM `article` WHERE `id` > 511541 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001155s ]
  13. SELECT * FROM `article` WHERE `id` < 511541 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.033479s ]
  14. SELECT * FROM `article` WHERE `id` < 511541 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003492s ]
  15. SELECT * FROM `article` WHERE `id` < 511541 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002121s ]
0.274999s