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Python知识点|Day21 列表推导式

  • 2026-08-22 03:39:44
Python知识点|Day21 列表推导式

Python知识点｜Day21 列表推导式

✨今日核心知识点
列表推导式是简洁语法，快速生成新列表。用一行代码替代简易for循环，常用于筛选、转换序列数据，代码精简，日常数据处理高频使用。
🌴基础语法原理
1. 基础格式： [表达式 for 变量 in 可迭代对象] 
2. 带条件筛选： [表达式 for 变量 in 可迭代对象 if 条件] 
3. 优势：代码简短；弊端：逻辑过于复杂时可读性变差
4. 仅适合生成列表，复杂循环依旧建议使用普通for循环
🎈代码实操示例
# 基础：生成0~9数字列表
num_list = [i for i in range(10)]
# 数据转换：数值翻倍
double = [i*2 for i in range(5)]
# 条件筛选：只保留偶数
even = [i for i in range(10) if i % 2 == 0
⚠️新手易错点
1. 不要堆砌多层循环与复杂判断，可读性会急剧下降
2. 列表推导式一次性生成完整列表，大数据会占用更多内存
3. 区分：()包裹不是列表推导式，是生成器表达式
4. 不要在推导式内执行print、文件操作等副作用代码
🏖️今日小结
列表推导式一行快速构建列表，支持条件筛选。简单转换、筛选场景首选；多层嵌套、复杂逻辑优先换成常规for循环，方便后期维护。
#Python #Python自学 #编程入门 #零基础学编程 #每日编程打卡 #一天一个Python知识点

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      140. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/vendor/topthink/think-trace/src/Html.php ( 4.42 KB )
      1. CONNECT:[ UseTime:0.000873s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
      2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001606s ]
      3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.021383s ]
      4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.009692s ]
      5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001815s ]
      6. SELECT * FROM `set` [ RunTime:0.000780s ]
      7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001512s ]
      8. SELECT * FROM `article` WHERE `id` = 511766 LIMIT 1 [ RunTime:0.030915s ]
      9. UPDATE `article` SET `lasttime` = 1787360563 WHERE `id` = 511766 [ RunTime:0.014589s ]
      10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000997s ]
      11. SELECT * FROM `article` WHERE `id` < 511766 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001503s ]
      12. SELECT * FROM `article` WHERE `id` > 511766 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001224s ]
      13. SELECT * FROM `article` WHERE `id` < 511766 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005106s ]
      14. SELECT * FROM `article` WHERE `id` < 511766 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.039779s ]
      15. SELECT * FROM `article` WHERE `id` < 511766 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.149749s ]
      0.487129s