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Python快速入门学习笔记十六:函数进阶知识(下)

  • 2026-06-30 05:48:35
Python快速入门学习笔记十六:函数进阶知识(下)

Python入门第十六课,主要是学习了函数的进阶知识:列表推导式,以及整理出了初学阶段需要掌握的一些常用函数。

  • 列表推导式
  • 常用内置函数梳理
    • 输入输出
    • 类型转换
    • 数学相关
    • 数据容器相关
    • 类型判断与对象相关
    • 判断逻辑相关
    • 字符串辅助相关

列表推导式

什么是列表推导式?用一条简洁语句来说,可迭代对象中,生成新列表的语法结构。

语法格式:

[ 表达式 for 变量 in 可迭代对象 ]

示例代码:

1️⃣ 让 nums 列表中所有的元素,都变为原来的2倍

nums = [12345]# 方式一:用map函数result = map(lambda num: num * 2, nums)print(type(result), list(result)) # <class 'map'> [2, 4, 6, 8, 10]# 方式二:使用for循环结合append方法print('\nnums', nums)result = []for num in nums:    result.append(num * 2)print(type(result), result) # <class 'list'> [2, 4, 6, 8, 10]# 方式三:使用列表推导式(实际上列表推导式就是 for + append 的简写形式)print('\nnums', nums)result = [num * 2for num in nums]print(type(result), result) # <class 'list'> [2, 4, 6, 8, 10]

2️⃣ 带条件的列表推导式

nums = [12345]result = [num * 2for num in nums if num > 2]print(type(result), result) # <class 'list'> [6, 8, 10]

3️⃣ 字典推导式

names = ['张三''李四''王五']scores = [607080]result = {names[i]: scores[i] for i in range(len(names))}print(type(result), result) # <class 'dict'> {'张三': 60, '李四': 70, '王五': 80}

4️⃣ 集合推导式

names = ['张三''李四''王五']result = {name + '!'for name in names}print(type(result), result) # <class 'set'> {'王五!', '李四!', '张三!'}

5️⃣ 注意:没有元组推导式,下面形似元组推导式的写法实际上叫:生成器(后面会介绍)

names = ['张三''李四''王五']result = ( name + '!'for name in names)print(type(result), result) # <class 'generator'> <generator object <genexpr> at 0x0000014946DEA8E0>

常用内置函数梳理

下面为大家整理出了初学阶段需要掌握的一些常用函数,当然后面随着继续学习持续学习还会接触到更多常用内置函数。

输入输出

函数/参数功能说明
print()
输出指定内容,下面是参数:
objects
要输出的内容
sep
输出多个内容时的分隔符
end
结尾追加的内容
file
输出位置(默认控制台)
flush
是否立即刷新输出
input()
获取用户输入

部分示例代码:

print(123, sep=' + ', end='\n\n'# 1 + 2 + 3

类型转换

函数/参数功能说明
int
转为整数
float()
转为浮点数
str()
转为字符串
bool()
转为布尔值
list()
转为列表
tuple()
转为元组
set()
转为集合
dict()
转为字典

数学相关

函数/参数功能说明
abs()
取绝对值
round()
银行家舍入法:小于5舍,大于5入,等于5看奇偶(奇入偶舍)
pow(a, b)
计算 a 的 b 次方
pow(a, b, c)
计算 a 的 b 次方,再对 c 取模
divmod(a, b)
返回(商,余数)
max()
最大值(支持 key)
min()
最小值(支持 key)
sum()
求和
map()
加工一组数据
filter()
按条件过滤数据
reduce()
合并计算(需要functools.reduce)
sorted
排序(支持 key)

部分示例代码:

print(abs(-1), abs(0), abs(1), abs(-3.14)) # 1 0 1 3.14print(round(3.141), round(3.161), round(3.151)) # 3.1 3.2 3.1print(pow(23), pow(231)) # 8 0print(divmod(102))  # (5, 0)print(divmod(103))  # (3, 1)print(divmod(104))  # (2, 2)items = [12345]print(max(items)) # 5print(min(items)) # 1print(sum(items)) # 15print(list(map(lambda x: x * 2, items))) # [2, 4, 6, 8, 10]print(list(filter(lambda x: x % 2 != 0, items))) # [1, 3, 5]print(reduce(lambda x, y: x + y, items)) # 15print(sorted(items)) # [1, 2, 3, 4, 5]print(sorted(items, reverse=True)) # [5, 4, 3, 2, 1]

数据容器相关

函数/参数功能说明
len()
获取容器中元素个数
range()
生成数字序列(常用于循环)
enumerate()
为序列添加索引
zip()
将多个序列一一配对

类型判断与对象相关

函数/参数功能说明
type()
查看对象类型
isinstance(obj, type)
判断对象是否属于某个类型
issubclass(A, B)
判断类 A 是否为类 B 的子类
id()
查看对象的内存地址

判断逻辑相关

函数/参数功能说明
all()
所有元素为真时,返回 True
any()
至少一个元素为真返回 True

字符串辅助相关

函数/参数功能说明
ord()
获取字符的 Unicode 编码值
chr()
将 Unicode 编码值转为字符

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  1. CONNECT:[ UseTime:0.000595s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000798s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000351s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000281s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000539s ]
  6. SELECT * FROM `set` [ RunTime:0.000245s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000586s ]
  8. SELECT * FROM `article` WHERE `id` = 491859 LIMIT 1 [ RunTime:0.000501s ]
  9. UPDATE `article` SET `lasttime` = 1783129059 WHERE `id` = 491859 [ RunTime:0.000993s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000269s ]
  11. SELECT * FROM `article` WHERE `id` < 491859 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001406s ]
  12. SELECT * FROM `article` WHERE `id` > 491859 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000485s ]
  13. SELECT * FROM `article` WHERE `id` < 491859 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003019s ]
  14. SELECT * FROM `article` WHERE `id` < 491859 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.015952s ]
  15. SELECT * FROM `article` WHERE `id` < 491859 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.038649s ]
0.132209s