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Python每日1语法·Day2

  • 2026-02-27 14:38:57
Python每日1语法·Day2

3个高频内置函数——len()/max()/min(),快速搞定数据统计

学习目标:掌握Python自带的3个实用内置函数,能用len()算长度、max()找最大值、min()找最小值,不用自己写复杂逻辑。


1. 今日核心语法

内置函数是Python提前帮我们写好的“工具函数”,直接调用就能用,不用自己定义。今天学3个新手最常用的:

函数名
作用
基本格式
len()
计算“容器”里的元素个数(长度)
len(容器)
(容器:字符串/列表/字典等)
max()
找一组数据里的最大值
max(数据集合)
min()
找一组数据里的最小值
min(数据集合)

2. 实用用法(直接复制运行)

# 用法1:len()——计算长度
# ① 计算字符串长度(字符个数)
name = "Python学习"
str_len = len(name)
print(f"字符串'{name}'的长度是:{str_len}")  # 输出:6(P/y/t/h/o/n/学/习?不,"Python学习"是6个字符?P(1),y(2),t(3),h(4),o(5),n(6),学(7),习(8)——修正,示例更简单)
# 修正示例:
name = "Python"
str_len = len(name)
print(f"字符串'{name}'的长度是:{str_len}")  # 输出:6

# ② 计算列表长度(元素个数)
scores = [8592789088]
list_len = len(scores)
print(f"成绩列表里有{list_len}个分数")  # 输出:5

# 用法2:max()——找最大值
max_score = max(scores)
print(f"最高分数是:{max_score}")  # 输出:92

# 用法3:min()——找最小值
min_score = min(scores)
print(f"最低分数是:{min_score}")  # 输出:78

# 综合用法:同时用3个函数
fruits = ["苹果""香蕉""橙子""草莓"]
print(f"水果列表有{len(fruits)}种水果")
print(f"按字母排序,最大的水果名是:{max(fruits)}")  # 字符串按Unicode排序,"香蕉">"橙子">"苹果">"草莓"
print(f"按字母排序,最小的水果名是:{min(fruits)}")

3. 今日小练习(动手敲一遍)

要求:

  1. 定义列表prices = [8.5, 6.8, 5.2, 9.1, 7.9](代表5种水果的单价);
  2. len()计算列表里有多少种水果;
  3. max()找最贵的水果单价;
  4. min()找最便宜的水果单价;
  5. 打印结果:“共有X种水果,最贵的单价是X元,最便宜的单价是X元”。

参考框架:

# 定义价格列表
prices = [8.56.85.29.17.9]

# 计算长度、最大值、最小值
fruit_count = len(prices)
max_price = max(prices)
min_price = min(prices)

# 打印结果
print(f"共有{fruit_count}种水果,最贵的单价是{max_price}元,最便宜的单价是{min_price}元")

4. 新人小提醒

✅ len()的参数必须是“有长度的容器”(比如字符串、列表),不能直接传数字(比如len(123)会报错); ✅ max()/min()处理的数据类型要统一:比如不能混传数字和字符串(max([123, "abc"])会报错); ✅ 如果传给max()/min()的列表是空的(比如max([])),程序会报错,新手先确保列表里有数据; ✅ 字符串的max()/min()是按字符的Unicode编码排序(比如字母a<b,中文按拼音/笔画排序),不用深究,知道“能比较”即可。


每天只吃透这一组语法!今天把示例和练习敲一遍、运行成功,就算掌握啦~ 明天我们学:if条件判断语句——让程序学会“做选择”。

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  1. CONNECT:[ UseTime:0.000467s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000658s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000311s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000293s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000569s ]
  6. SELECT * FROM `set` [ RunTime:0.000258s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000598s ]
  8. SELECT * FROM `article` WHERE `id` = 476625 LIMIT 1 [ RunTime:0.000433s ]
  9. UPDATE `article` SET `lasttime` = 1772260661 WHERE `id` = 476625 [ RunTime:0.006035s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.001761s ]
  11. SELECT * FROM `article` WHERE `id` < 476625 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000490s ]
  12. SELECT * FROM `article` WHERE `id` > 476625 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000516s ]
  13. SELECT * FROM `article` WHERE `id` < 476625 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000952s ]
  14. SELECT * FROM `article` WHERE `id` < 476625 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001167s ]
  15. SELECT * FROM `article` WHERE `id` < 476625 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002802s ]
0.087420s