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Python字典这15个技巧都不会?难怪你的代码又慢又丑

  • 2026-03-16 07:06:16
Python字典这15个技巧都不会?难怪你的代码又慢又丑

引言

大家好,我是小甲鱼!

最近有粉丝问我:"鱼哥,为什么同样一个问题,我写的代码又长又慢,别人三行就搞定了?"

仔细一看,问题出在字典上。

字典(dict)是Python中最常用的数据结构,但很多人只会用dict['key']这种基础操作。今天,我把常用的15个字典技巧全教给你,保证让你的代码简洁又高效!


1. 快速创建字典

传统写法(太长了)

# 逐个赋值,麻烦!
d = {}
d['name'] = 'xiaojiaoyu'
d['age'] = 18
d['city'] = '广州'

快速写法

# 方法1:dict() 构造函数
d = dict(name='xiaojiaoyu', age=18, city='广州')

# 方法2:字典推导式(推荐)
keys = ['name''age''city']
values = ['xiaojiaoyu'18'广州']
d = {k: v for k, v inzip(keys, values)}

# 方法3:fromkeys() 批量创建
d = dict.fromkeys(['name''age''city'], '默认值')

小甲鱼说: 字典推导式是Python最强大的特性之一,一定要掌握!


2. 合并字典的正确姿势

旧方法(会覆盖)

d1 = {'a'1'b'2}
d2 = {'b'3'c'4}
d1.update(d2)  # b被覆盖了!

新方法(Python 3.9+)

d1 = {'a'1'b'2}
d2 = {'b'3'c'4}
d3 = d1 | d2  # {'a': 1, 'b': 3, 'c': 4}

# 或者用 |= 就地修改
d1 |= d2

兼容旧版本

# 使用 {**dict1, **dict2}
d3 = {**d1, **d2}

3. 获取值的正确方式

危险写法

d = {'name''xiaojiaoyu'}
print(d['age'])  # KeyError: 'age' 程序崩溃!

安全获取五招

d = {'name''xiaojiaoyu''age'18}

# 方法1:get() - 最常用
print(d.get('age'0))        # 18
print(d.get('score'0))     # 0(默认值)

# 方法2:setdefault() - 获取并设置默认值
result = d.setdefault('city''广州')
print(result)  # 广州(如果不存在才设置)

# 方法3:collections.defaultdict
from collections import defaultdict
dd = defaultdict(list)  # 不存在的key返回空列表
dd['scores'].append(100)  # 直接用,不报错!

# 方法4:try-except
try:
print(d['score'])
except KeyError:
print('不存在')

# 方法5:in 判断
if'age'in d:
print(d['age'])

4. 字典推导式的进阶玩法

# 基础:交换键值对
d = {'a'1'b'2'c'3}
reversed_d = {v: k for k, v in d.items()}
# {1: 'a', 2: 'b', 3: 'c'}

# 进阶:条件过滤
scores = {'tom'85'jerry'92'spike'67'tyke'78}
high_scorers = {k: v for k, v in scores.items() if v >= 80}
# {'tom': 85, 'jerry': 92}

# 高级:多重条件
data = {'apple'10'banana'5'cherry'20'date'15}
result = {k: v for k, v in data.items() iflen(k) > 5and v > 10}
# {'banana': 5... 等等,条件是 v > 10,所以是 {'cherry': 20, 'date': 15}

5. 遍历字典的高效方法

d = {'name''xiaojiaoyu''age'18'city''广州'}

# 只遍历键
for key in d:
print(key)

# 只遍历值
for value in d.values():
print(value)

# 同时遍历键值对(推荐)
for key, value in d.items():
print(f'{key}{value}')

# enumerate 枚举
for i, (k, v) inenumerate(d.items(), 1):
print(f'{i}{k}{v}')

6. 统计神器:Counter

from collections import Counter

# 统计列表中元素出现次数
nums = [123121312]
counter = Counter(nums)
print(counter)  # Counter({1: 4, 2: 3, 3: 2})

# 统计字符串
text = "hello world"
counter = Counter(text)
print(counter.most_common(3))  # [('l', 3), ('o', 2), ('h', 1)]

# 统计单词
words = ['apple''banana''apple''cherry''banana''apple']
word_count = Counter(words)
print(word_count)  # Counter({'apple': 3, 'banana': 2, 'cherry': 1})

7. 字典排序的多种方式

d = {'tom'85'jerry'92'spike'67}

# 按键排序
sorted_by_key = dict(sorted(d.items()))
# {'jerry': 92, 'spike': 67, 'tom': 85}

# 按值升序排序
sorted_by_value = dict(sorted(d.items(), key=lambda x: x[1]))
# {'spike': 67, 'tom': 85, 'jerry': 92}

# 按值降序排序
sorted_by_value_desc = dict(sorted(d.items(), key=lambda x: x[1], reverse=True))
# {'jerry': 92, 'tom': 85, 'spike': 67}

8. 字典的集合运算

d1 = {'a'1'b'2'c'3}
d2 = {'b'2'c'4'd'5}

# 键的交集
common_keys = d1.keys() & d2.keys()
# {'b', 'c'}

# 键的并集
all_keys = d1.keys() | d2.keys()
# {'a', 'b', 'c', 'd'}

# 键的差集
only_in_d1 = d1.keys() - d2.keys()
# {'a'}

# 键的对称差集(只在其中一个出现)
xor_keys = d1.keys() ^ d2.keys()
# {'a', 'd'}

9. 一行代码实现数据分组

from itertools import groupby

# 按成绩分组
students = [
    {'name''tom''score'85},
    {'name''jerry''score'92},
    {'name''spike''score'67},
    {'name''tyke''score'67}
]

# 按分数分组
scores = [85926767]
groups = {}
for student in students:
    score = student['score']
if score notin groups:
        groups[score] = []
    groups[score].append(student['name'])

print(groups)
# {85: ['tom'], 92: ['jerry'], 67: ['spike', 'tyke']}

# 更简洁的写法
from collections import defaultdict
groups = defaultdict(list)
for s in students:
    groups[s['score']].append(s['name'])
print(dict(groups))

10. 嵌套字典的优雅操作

# 创建嵌套字典
users = {
'tom': {'age'20'city''北京'},
'jerry': {'age'25'city''上海'}
}

# 使用 ChainMap 合并多个字典
from collections import ChainMap
default_settings = {'theme''dark''language''zh'}
user_settings = {'theme''light'}
merged = ChainMap(user_settings, default_settings)
print(merged['theme'])  # light(优先使用前面的)
print(merged['language'])  # zh(回退到后面的)

11. 字典弹出操作

d = {'a'1'b'2'c'3}

# pop() - 弹出并删除
value = d.pop('b')
print(value)  # 2
print(d)      # {'a': 1, 'c': 3}

# popitem() - 弹出最后一项(Python 3.7+)
key, value = d.popitem()
print(key, value)  # c 3

# clear() - 清空字典
d.clear()
print(d)  # {}

12. 字典视图对象

d = {'a'1'b'2'c'3}

# keys() - 键的视图
print(d.keys())  # dict_keys(['a', 'b', 'c'])

# values() - 值的视图
print(d.values())  # dict_values([1, 2, 3])

# items() - 键值对的视图
print(d.items())  # dict_items([('a', 1), ('b', 2), ('c', 3)])

# 视图是动态的!
d['d'] = 4
print(d.keys())  # dict_keys(['a', 'b', 'c', 'd'])

13. 字典推导式做数据转换

# JSON 转 字典
import json
json_str = '{"name": "xiaojiaoyu", "age": 18}'
data = json.loads(json_str)

# 字典键值转换大小写
d = {'Name''Tom''AGE'20}
d_lower = {k.lower(): v for k, v in d.items()}
# {'name': 'tom', 'age': 20}

# 扁平化嵌套字典
nested = {'user': {'name''tom''age'20}}
flat = {'_'.join([k1, k2]): v for k1, v1 in nested.items() for k2 in v1}
# {'user_name': 'tom', 'user_age': 20}

14. 字典的解包操作

d = {'a'1'b'2'c'3}

# ** 解包
deffunc(a, b, c):
print(a, b, c)

func(**d)  # 1 2 3

# 合并解包
d1 = {'a'1}
d2 = {'b'2}
d3 = {**d1, **d2}
print(d3)  # {'a': 1, 'b': 2}

15. 字典比较和相等判断

d1 = {'a'1'b'2}
d2 = {'b'2'a'1}
d3 = {'a'1'b'3}

# 比较内容(顺序无关)
print(d1 == d2)  # True!
print(d1 == d3)  # False

# 比较键
print(d1.keys() == d2.keys())  # True

总结

今天学习了Python字典的15个高级技巧:

  1. 1. 快速创建 - dict()、推导式、fromkeys()
  2. 2. 合并字典 - | 运算符(Python 3.9+)
  3. 3. 安全获取 - get()、setdefault()、defaultdict
  4. 4. 推导式进阶 - 过滤、交换键值
  5. 5. 高效遍历 - items()、values()
  6. 6. 统计神器 - Counter
  7. 7. 排序 - sorted() + lambda
  8. 8. 集合运算 - 键的交并差
  9. 9. 数据分组 - defaultdict
  10. 10. 嵌套字典 - ChainMap
  11. 11. 弹出操作 - pop()、popitem()
  12. 12. 视图对象 - keys()、values()、items()
  13. 13. 数据转换 - JSON、扁平化
  14. 14. 解包操作 - **dict
  15. 15. 比较判断 - == 比较内容

写在最后

今日话题:你在项目中用过哪些字典的高级用法?在评论区分享一下吧!

点赞 - 让更多Python学习者看到这篇文章
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关注 - 点关注不迷路,小甲鱼带你学Python!

我们下期再见!


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  1. CONNECT:[ UseTime:0.001226s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001836s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000672s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000595s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001260s ]
  6. SELECT * FROM `set` [ RunTime:0.000499s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001236s ]
  8. SELECT * FROM `article` WHERE `id` = 480221 LIMIT 1 [ RunTime:0.003022s ]
  9. UPDATE `article` SET `lasttime` = 1774593859 WHERE `id` = 480221 [ RunTime:0.001679s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000595s ]
  11. SELECT * FROM `article` WHERE `id` < 480221 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000965s ]
  12. SELECT * FROM `article` WHERE `id` > 480221 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.007478s ]
  13. SELECT * FROM `article` WHERE `id` < 480221 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001884s ]
  14. SELECT * FROM `article` WHERE `id` < 480221 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003828s ]
  15. SELECT * FROM `article` WHERE `id` < 480221 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.025253s ]
0.150765s