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Python基础逻辑运算

  • 2026-02-06 22:19:28
Python基础逻辑运算

Python基础💡逻辑运算

💡 一、为什么需要逻辑运算?
举例:判断一个人是否是未成年学生、或者是否允许进入某个活动,仅靠单一条件无法判断完整情况。逻辑运算能让程序像人一样“思考多条规则”,执行更灵活的操作。

💡 二、主要逻辑运算符
1️⃣ and:同时满足条件
当所有条件都成立时,执行代码。
例子:未成年且是学生
age = 17
is_student = True

if age < 18 and is_student:
print("未成年学生")

输出:
未成年学生


2️⃣ or:满足任意条件
任意一个条件成立即可执行代码。
例子:成年或有许可
age = 17
has_permission = True

if age >= 18 or has_permission:
print("可以进入")

输出:
可以进入

3️⃣ not:取反
用于反转条件的布尔值。
例子:不下雨就可以出门
is_raining = False

if not is_raining:
print("可以出门")

输出:

可以出门

💡 三、组合使用
逻辑运算可以组合使用,形成更复杂的判断规则。
例如判断是否允许访问某个场景,可以同时考虑年龄、学生身份和权限。

age = 17
is_student = True
has_permission = False

if age < 18 and is_student or has_permission:
print("允许访问")


输出:

允许访问


✅ 说明:

and 优先计算,再计算 or

逻辑运算组合让程序处理更复杂的条件

💡 四、本讲总结
and:所有条件都成立
or:任意条件成立
not:条件取反
逻辑运算让程序更智能,可以处理多条件判断
结合 if/else,你就能写出更贴近真实场景的程序逻辑
#Python#编程#转码#人工智能#大模型#Python零基础

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      136. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/vendor/topthink/think-template/src/Template.php ( 46.61 KB )
      137. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/vendor/topthink/think-template/src/template/driver/File.php ( 2.41 KB )
      138. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/vendor/topthink/think-template/src/template/contract/DriverInterface.php ( 0.86 KB )
      139. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/runtime/temp/067d451b9a0c665040f3f1bdd3293d68.php ( 11.98 KB )
      140. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/vendor/topthink/think-trace/src/Html.php ( 4.42 KB )
      1. CONNECT:[ UseTime:0.000874s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
      2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001401s ]
      3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.011544s ]
      4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.016483s ]
      5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001619s ]
      6. SELECT * FROM `set` [ RunTime:0.007805s ]
      7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001405s ]
      8. SELECT * FROM `article` WHERE `id` = 474011 LIMIT 1 [ RunTime:0.029588s ]
      9. UPDATE `article` SET `lasttime` = 1770431964 WHERE `id` = 474011 [ RunTime:0.122452s ]
      10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.101153s ]
      11. SELECT * FROM `article` WHERE `id` < 474011 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.094851s ]
      12. SELECT * FROM `article` WHERE `id` > 474011 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.015038s ]
      13. SELECT * FROM `article` WHERE `id` < 474011 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.066807s ]
      14. SELECT * FROM `article` WHERE `id` < 474011 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.011716s ]
      15. SELECT * FROM `article` WHERE `id` < 474011 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.018815s ]
      0.659776s