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Python快速入门学习笔记十一:数据容器 之 字典

  • 2026-05-02 18:53:17
Python快速入门学习笔记十一:数据容器 之 字典

Python入门第十一课,主要学习最重要的数据容器——字典,字典是基于键值对的映射容器,通过键快速存取数据,是组织和检索结构化信息的核心工具。

  • 什么是字典
  • 定义字典
  • 字典的增删改查
    • 新增
    • 删除
    • 修改
    • 查询
  • 字典的常用方法
  • 字典的循环遍历
  • 字典总结

什么是字典

字典:用来存放一组键值对数据,可通过键对值进行增删改查操作。

定义字典

字典用大括号{}包裹,每个元素之间用逗号,分隔,每个元素的格式为key:value

示例代码:

d1 = {'张三'72'李四'60'王五'85}
print(type(d1), d1) # <class 'dict'> {'张三': 72, '李四': 60, '王五': 85}

字典中的key不能重复,若出现重复,则后写的会覆盖之前写的。

d1 = {'张三'72'李四'60'王五'85'张三'99}
print(type(d1), d1) # <class 'dict'> {'张三': 99, '李四': 60, '王五': 85}

定义空字典。

d3 = {}
d33 = dict()
print(type(d3), d3) # <class 'dict'> {}
print(type(d33), d33) # <class 'dict'> {}

字典中的key必须是不可变类型,但value可以是任意类型。

d4 = {25272'李四'88'王五'41}
d5 = {('抽烟''喝酒'): 0'李四'88'王五'79}
print(type(d4), d4) # <class 'dict'> {252: 72, '李四': 88, '王五': 41}
print(type(d5), d5) # <class 'dict'> {('抽烟', '喝酒'): 0, '李四': 88, '王五': 79}
d6 = {['抽烟''喝酒']: 0'李四'88'王五'79# 运行报错:TypeError: unhashable type: 'list',列表是可变类型不能作为key

字典可以嵌套。

student_dict = {
2025001: {
'姓名''张三',
'年龄'18,
'成绩'72,
'爱好': ['抽烟''喝酒''烫头']
    },
2025002: {
'姓名''李四',
'年龄'19,
'成绩'60,
'爱好': ['唱歌''跳舞''打台球']
    },
2025003: {
'姓名''王五',
'年龄'20,
'成绩'85,
'爱好': ['学习''看书''打太极']
    },
}
print(type(student_dict), student_dict)

字典的增删改查

新增

新增语法:字典[key] = 值

d1 = {'张三'72'李四'60'王五'85}
d1['赵六'] = 100
print(d1) # {'张三': 72, '李四': 60, '王五': 85, '赵六': 100}

删除

删除有三种方式:

  • del 字典[key]除指定key所对应的那组键值对。
  • 字典.pop(key, default)删除指定Key所对应的那组键值对,并返回这个key所对应的值。如果key不存在,返回default(如果没有设置default,则会报错)。
  • d1.clear()清空字典。

示例代码:

d1 = {'张三'72'李四'60'王五'85}

# 删除指定key所对应的那组键值对
del d1['李四']
print(d1)

# 删除指定Key所对应的那组键值对,并返回这个key所对应的值
result = d1.pop('张三')
print(result) # 72
print(d1) # {'王五': 85}

# pop方法可以设置默认值
# 默认值可以保证,当要删除的key不存在的情况下,程序不会报错,并且返回这个默认值
# result = d1.pop('赵六') # 没有默认值,运行则会报错:KeyError: '赵六'
result = d1.pop('赵六''删除失败')
print(result) # 删除失败

# 清空字典
print(d1)
d1.clear()
print(d1) # {}

修改

修改单个元素,与新增的语法一样,字典[key] = 值,若字典中有对应的key则修改,否则为新增。

批量修改的语法为:字典.update(字典)

示例代码:

d1 = {'张三'72'李四'60'王五'85}
d1['张三'] = 92
print(d1) # {'张三': 92, '李四': 60, '王五': 85}

# 批量修改
d1.update({'李四':99'王五'88'赵六'100})
print(d1) # {'张三': 92, '李四': 99, '王五': 88, '赵六': 100}

查询

查询方式两种:

  • 字典[key]直接取值,若key不存在,会报错。
  • 字典.get(key, default)安全取值,若key不存在,会返回默认值,如果没有设置默认值,则会返回None。

示例代码:

d1 = {'张三'72'李四'60'王五'85}

# 直接取值
print(d1['张三']) # 72
# print(d1['张三丰']) # 运行报错:KeyError: '张三丰'

# 安全取值
print(d1.get('李四')) # 60
print(d1.get('张三丰')) # None
print(d1.get('张三丰''抱歉,key 不存在!')) # 抱歉,key 不存在!

字典的常用方法

keys方法,获取字典中所有的键。

该方法返回值不是list,是一种叫做dict_keys的类型。但是dict_keys和列表类似,可以被遍历,但要注意的是:它不能通过下标访问元素。借助内置的list函数,可以将dict_keys转换成list。

d1 = {'张三'72'李四'60'王五'85}

result = d1.keys()
print(type(result), result) # <class 'dict_keys'> dict_keys(['张三', '李四', '王五'])

# 遍历dict_keys
for item in result:
    print(item)

# 将dict_keys转换成list
l1 = list(result)
print(type(l1), l1) # <class 'list'> ['张三', '李四', '王五']

values方法,获取字典中所有的值。

该方法返回的值类型是dict_values,它的特点和dict_keys一样。

d1 = {'张三'72'李四'60'王五'85}
result = d1.values()
print(type(result), result) # <class 'dict_values'> dict_values([72, 60, 85])

# 遍历dict_values
for item in result:
    print(item)

# 将dict_values转换成list
l1 = list(result)
print(type(l1), l1) # <class 'list'> [72, 60, 85]

items方法,获取字典中所有的键值对,每组键值对以元组的形式呈现。

该方法返回的值类型是dict_items,它的特点和dict_keys一样。

d1 = {'张三'72'李四'60'王五'85}
result = d1.items()
print(type(result), result) # <class 'dict_items'> dict_items([('张三', 72), ('李四', 60), ('王五', 85)])

# 遍历dict_items
for item in result:
    print(item, type(item))
# 遍历打印结果:
# ('张三', 72) <class 'tuple'>
# ('李四', 60) <class 'tuple'>
# ('王五', 85) <class 'tuple'>

# 将dict_items装成list
l1 = list(result)
print(type(l1), l1) # <class 'list'> [('张三', 72), ('李四', 60), ('王五', 85)]

字典的循环遍历

字典不能使用while循环遍历,要使用for来循环遍历。

d1 = {'张三'72'李四'60'王五'85}

for key in d1:
    print(key, d1[key])

for key in d1.keys():
    print(key, d1[key])

# 这两种写法运行结果一致,如下:
# 张三 72
# 李四 60
# 王五 85

字典总结

  • 键值对结构:字典中的数据以key:value的形式存在,每个键都对应一个值。
  • 键唯一:字典中的键key不能重复,若重复则后写的会覆盖前写的。
  • 键不可变:键必须是不可变类型(如数字、字符串、元组等),而值可以是任意类型。
  • 不支持下标:字典中的元素不能通过下标取值。
  • 支持增删改查,支持for循环遍历。

一句话总结:字典是一种以“键”找“值”的映射型容器,当需要【唯一标识 -> 对应信息】的结构时,首选字典。

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  1. CONNECT:[ UseTime:0.000597s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000666s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000250s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000262s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000592s ]
  6. SELECT * FROM `set` [ RunTime:0.000228s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000558s ]
  8. SELECT * FROM `article` WHERE `id` = 485648 LIMIT 1 [ RunTime:0.000550s ]
  9. UPDATE `article` SET `lasttime` = 1777722464 WHERE `id` = 485648 [ RunTime:0.005078s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000256s ]
  11. SELECT * FROM `article` WHERE `id` < 485648 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000480s ]
  12. SELECT * FROM `article` WHERE `id` > 485648 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000725s ]
  13. SELECT * FROM `article` WHERE `id` < 485648 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000755s ]
  14. SELECT * FROM `article` WHERE `id` < 485648 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000783s ]
  15. SELECT * FROM `article` WHERE `id` < 485648 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002233s ]
0.083024s