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Python 字典超实用技巧:添加/修改元素,一看就会!

  • 2026-07-01 18:41:46
Python 字典超实用技巧:添加/修改元素,一看就会!

字典(dict)是 Python 中最常用、最高效的数据结构,核心就是「键值对」(key: value),就像我们用的字典——键(key)是查找的字,值(value)是字的解释

今天用最简单的例子,一次性讲透字典添加元素、修改元素的所有用法,新手也能直接复制用!


一、先认识一个基础字典

先定义一个简单的用户信息字典,方便后面举例:

# 定义一个基础字典
user = {
"name""小明",
"age"20,
"gender""男"
}
print(user)
# 输出:{'name': '小明', 'age': 20, 'gender': '男'}

二、字典添加元素(3种常用方法)

1. 最常用:直接赋值(最简单)

语法字典名[新键] = 新值如果键不存在,就是添加新元素; 如果键已存在,就是修改元素

user = {"name""小明""age"20}

# 添加新键值对:城市
user["city"] = "北京"
# 添加新键值对:职业
user["job"] = "学生"

print(user)
# 输出:{'name': '小明', 'age': 20, 'city': '北京', 'job': '学生'}

✅ 适用场景:日常开发90%的场景都用这个,简单直观!


2. 批量添加:update() 方法

一次添加多个键值对,适合批量更新字典。语法字典名.update({键1:值1, 键2:值2})

user = {"name""小明""age"20}

# 一次性添加多个元素
user.update({
"city""上海",
"job""程序员",
"hobby""打篮球"
})

print(user)
# 输出:{'name': '小明', 'age': 20, 'city': '上海', 'job': '程序员', 'hobby': '打篮球'}

✅ 适用场景:需要一次性加很多键值对时,代码更整洁。


3. 安全添加:setdefault() 方法

这个方法很特别:

  • 键不存在:添加元素,返回新值
  • 键已存在不修改,返回原有值
user = {"name""小明""age"20}

# 键不存在 → 添加成功
user.setdefault("city""广州")
print(user)  # {'name': '小明', 'age': 20, 'city': '广州'}

# 键已存在 → 不修改,返回原值
user.setdefault("age"30)
print(user)  # {'name': '小明', 'age': 20, 'city': '广州'}

✅ 适用场景:怕覆盖原有数据,只想「有则不动、无则添加」。


三、字典修改元素(2种常用方法)

修改元素的核心:键必须已存在,否则会变成添加!

1. 最常用:直接赋值修改

语法字典名[已有键] = 新值

user = {"name""小明""age"20}

# 修改年龄
user["age"] = 25
# 修改姓名
user["name"] = "小红"

print(user)
# 输出:{'name': '小红', 'age': 25}

2. 批量修改:update() 方法

和批量添加用法一样,适合一次性改多个值:

user = {"name""小明""age"20"city""北京"}

# 批量修改
user.update({
"age"26,
"city""深圳"
})

print(user)
# 输出:{'name': '小明', 'age': 26, 'city': '深圳'}

四、1张表总结核心用法

操作
语法
特点
单个添加/修改
dict[key] = value
最简单、最常用
批量添加/修改
dict.update({...})
一次处理多个键值对
安全添加(不覆盖)
dict.setdefault(key, value)
键存在则不修改

五、新手必避坑!

  1. 字典的键(key)不能重复,重复键会自动覆盖旧值;
  2. 键可以是:字符串、数字、元组(不可变类型),不能是列表
  3. 修改元素时,一定要确保键存在,否则会变成「添加元素」。

总结

  1. 添加元素:直接赋值、update()setdefault(),按需选择;
  2. 修改元素:直接赋值、update(),键必须已存在;
  3. 日常开发优先用直接赋值,简单好记,代码最清爽!

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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:0.000878s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002015s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000286s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000706s ]
  6. SELECT * FROM `set` [ RunTime:0.000256s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000723s ]
  8. SELECT * FROM `article` WHERE `id` = 496122 LIMIT 1 [ RunTime:0.000788s ]
  9. UPDATE `article` SET `lasttime` = 1783016366 WHERE `id` = 496122 [ RunTime:0.004543s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000278s ]
  11. SELECT * FROM `article` WHERE `id` < 496122 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000442s ]
  12. SELECT * FROM `article` WHERE `id` > 496122 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003518s ]
  13. SELECT * FROM `article` WHERE `id` < 496122 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002189s ]
  14. SELECT * FROM `article` WHERE `id` < 496122 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.021315s ]
  15. SELECT * FROM `article` WHERE `id` < 496122 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.010521s ]
0.122160s