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从零开始学python-字典

  • 2026-02-05 18:34:14
从零开始学python-字典

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前言:

   主要分享的是Python版本为Python3的内容。

  • 字典(Dictionary)是Python中一种可变的、无序的键值对集合,以键值对(key-value) 形式存储数据,自Python 3.7起,字典严格保持插入顺序(官方语言规范),同时具备O(1)平均时间复杂度的查找/插入/删除性能。

  • 字典通过键来访问值,而不是通过索引,字典中的键必须是不可变类型(如字符串、数字、元组),且唯一,而值可以是任意类型。

一、核心特性

✅ 可变对象:内容可动态修改

✅ 键唯一性:重复键会覆盖旧值

✅ 键不可变:键必须是可哈希类型(str, int, tuple等)

✅ 值任意类型:可存储数字、列表、函数甚至其他字典

✅ 有序性:Python 3.7+ 保证插入顺序(非排序)

二、创建字典

1. 使用花括号创建

①. 创建空字典empty_dict = {}print(empty_dict)  # {}②. 创建有初始值的字典person = {    "name""张三",    "age"25,    "city""北京"}print(person)  # {'name''张三''age'25'city''北京'}

2. 使用dict()构造函数

方式1:使用关键字参数dict1 = dict(name="李四", age=30)print(dict1)  # {'name''李四''age'30}方式2:使用键值对列表dict2 = dict([("name""王五"), ("age"28)])print(dict2)  # {'name''王五''age'28}方式3:使用可迭代对象dict3 = dict(zip(["name""age"], ["赵六"32]))print(dict3)  # {'name''赵六''age'32}

3. 使用字典推导式

创建键为数字,值为平方的字典:squares = {x: x**2 for x in range(16)}print(squares)  # {112439416525}

三、访问字典元素

1. 使用键访问

student = {"name""小明""score"90"grade""A"}①. 直接使用键访问print(student["name"])  # 小明②. 使用get()方法(更安全,键不存在时返回None或默认值)print(student.get("name"))      # 小明print(student.get("age"))       # Noneprint(student.get("age"0))    # 0(设置默认值)

2. 检查键是否存在

if "name" in student:    print(f"姓名: {student['name']}")  # 姓名: 小明if "age" not in student:    print("年龄信息不存在")  # 年龄信息不存在

四、修改字典

1. 添加或修改元素

①. 添加新键值对student["age"] = 18print(student)  # {'name''小明''score'90'grade''A''age'18}②. 修改已有键的值student["score"] = 95print(student)  # {'name''小明''score'95'grade''A''age'18}③. 使用update()合并字典student.update({"age"19"class""三年二班"})print(student)  # {'name''小明''score'95'grade''A''age'19'class''三年二班'}

2. 删除元素

①. 使用del语句del student["grade"]print(student)  # {'name''小明''score'95'age'19'class''三年二班'}②. 使用pop()方法(返回被删除的值)score = student.pop("score")print(score)    # 95print(student)  # {'name''小明''age'19'class''三年二班'}③. 使用popitem()删除最后插入的键值对(Python 3.7+有序)last_item = student.popitem()print(last_item)  # ('class''三年二班')print(student)    # {'name''小明''age'19}④. 清空字典student.clear()print(student)  # {}

五、遍历字典

book = {    "title""Python编程",    "author""John Doe",    "year"2023,    "price"59.9}①. 遍历所有键print("所有键:")for key in book.keys():    print(f"- {key}")# 输出:# - title# - author# - year# - price②. 遍历所有值print("\n所有值:")for value in book.values():    print(f"- {value}")# 输出:# - Python编程# - John Doe# - 2023# - 59.9③. 遍历所有键值对print("\n所有键值对:")for key, value in book.items():    print(f"{key}{value}")# 输出:# title: Python编程# author: John Doe# year: 2023# price: 59.9

六、字典常用方法

1. setdefault() - 安全设置默认值
data = {"a"1"b"2}①. 键不存在时设置默认值value = data.setdefault("c"3)print(value)  # 3print(data)   # {'a'1'b'2'c'3}②. 键存在时返回现有值value = data.setdefault("a"100)print(value)  # 1(保持原值不变)

2. fromkeys() - 从序列创建字典

①. 创建具有相同默认值的字典keys = ["name""age""city"]default_dict = dict.fromkeys(keys, "未知")print(default_dict)  # {'name''未知''age''未知''city''未知'}②. 使用不同的默认值class DefaultFactory:    def __init__(self):        self.counter = 0    def __call__(self):        self.counter += 1        return f"值{self.counter}"factory = DefaultFactory()dynamic_dict = dict.fromkeys(keys, factory())print(dynamic_dict)  # {'name''值1''age''值1''city''值1'}

3. copy() - 创建浅拷贝

original = {"a"1"b": [234]}copied = original.copy()original["a"] = 10original["b"].append(5)print(original)  # {'a'10'b': [2345]}print(copied)    # {'a'1'b': [2345]}  # 注意:列表是浅拷贝

七、嵌套字典

①. 创建嵌套字典school = {    "class1": {        "teacher""王老师",        "students": ["张三""李四""王五"],        "score": {"数学": 85, "语文": 90}    },    "class2": {        "teacher""张老师",        "students": ["赵六""孙七"],        "score": {"数学": 88, "语文": 92}    }}②. 访问嵌套字典print(school["class1"]["teacher"])          # 王老师print(school["class1"]["students"][0])      # 张三print(school["class1"]["score"]["数学"])     # 85③. 修改嵌套字典school["class1"]["students"].append("周八")school["class1"]["score"]["英语"] = 88

八、字典视图对象

Python 3中的keys()、values()和items()返回的是视图对象,它们会动态反映字典的变化:

d = {"a"1"b"2"c"3}keys_view = d.keys()values_view = d.values()items_view = d.items()print(list(keys_view))   # ['a''b''c']print(list(values_view)) # [123]# 修改字典d["d"] = 4d["a"] = 100# 视图对象会动态更新print(list(keys_view))   # ['a''b''c''d']print(list(values_view)) # [100234]print(list(items_view))  # [('a'100), ('b'2), ('c'3), ('d'4)]

九、字典合并(Python 3.9+)

①. Python 3.9+ 使用 | 运算符合并字典dict1 = {"a"1"b"2}dict2 = {"b"3"c"4}②. 合并字典,后者优先级高merged = dict1 | dict2print(merged)  # {'a'1'b'3'c'4}③. 原地合并dict1 |= dict2print(dict1)   # {'a'1'b'3'c'4}

十、遍历技巧(顺序验证)

info = {'city''Beijing''pop'2100}①. 遍历键(推荐)for k in info:    print(k)  # city → pop ✅(保持插入顺序)②. 遍历键值对for k, v in info.items():    print(f"{k}{v}")  # city: Beijing# pop: 2100 ✅

十一、避坑指南

陷阱
错误示例
正确做法
可变对象作键
d = {[1]:1}
 ❌
d = {(1,):1}
 ✅(元组)
浅拷贝陷阱
d2 = d1; d2['x']=0
 → d1也被改
d2 = d1.copy()
 或 copy.deepcopy()
修改遍历时的字典
for k in d: del d[k]
 ❌
先转列表:for k in list(d): ... ✅

浅拷贝验证

original = {'data': [1,2]}shallow = original.copy()shallow['data'].append(3)print(original)  # {'data': [123]} → 内部列表被共享!

十二、总结与最佳实践

  • 键的选择:优先用字符串,确保不可变、可哈希

  • 安全访问:用 .get(key, default) 避免 KeyError

  • 性能优势:大数据查找场景远优于列表

  • 内存注意:字典内存开销大于列表/元组

  • 版本意识:依赖顺序时需注明 Python ≥ 3.7

  • 调试技巧:用 pprint 模块美化嵌套字典输出

【微语】保持谦逊,因为山外有山。

网虫root

期待你的

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  1. CONNECT:[ UseTime:0.001105s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001629s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.003994s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.002350s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001735s ]
  6. SELECT * FROM `set` [ RunTime:0.006735s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001777s ]
  8. SELECT * FROM `article` WHERE `id` = 473704 LIMIT 1 [ RunTime:0.001075s ]
  9. UPDATE `article` SET `lasttime` = 1770437799 WHERE `id` = 473704 [ RunTime:0.015284s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.011324s ]
  11. SELECT * FROM `article` WHERE `id` < 473704 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.011778s ]
  12. SELECT * FROM `article` WHERE `id` > 473704 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002450s ]
  13. SELECT * FROM `article` WHERE `id` < 473704 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.036569s ]
  14. SELECT * FROM `article` WHERE `id` < 473704 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.022027s ]
  15. SELECT * FROM `article` WHERE `id` < 473704 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.108268s ]
0.385925s