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Python知识点 | Day05while循环基础用法

  • 2026-08-18 23:11:41
Python知识点 | Day05while循环基础用法

Python知识点 | Day05while循环基础用法

🎈今日核心知识点🎈
循环语句用来重复执行一段代码，while是Python基础循环，依靠条件真假控制循环启停，适合不确定循环次数的场景。
基础语法原理
while 循环语法格式：
while 条件表达式:
循环体代码
逻辑规则：条件结果为True，持续执行循环代码；条件为False，立刻退出循环。
☃️代码实操示例☃️
# 示例1：简单循环，打印1-5
i = 1
while i <= 5:
print(i)
i = i + 1 # 计数器自增，避免死循环

# 示例2：循环求和 1~10累加
sum_num = 0
n = 1
while n <= 10:
sum_num = sum_num + n
n += 1
print("1到10总和：", sum_num)

# 示例3：break跳出整个循环
a = 1
while a <= 10:
if a == 6:
break
print(a)
a += 1
⚠️新手易错点
1. 循环内必须设置变量更新语句，否则条件永久成立，进入死循环
2. while后条件末尾添加英文冒号，循环代码严格缩进对齐
3. break作用是直接终止并跳出当前循环，仅对所在一层循环生效
4. 不要混用赋值符号=与判断符号==作为循环条件
✨今日小结
while循环依靠条件控制重复逻辑，多用于次数未知的重复操作，搭配break灵活退出循环，是批量处理数据的基础语法。
#Python #Python自学 #编程入门 #计算机基础 #零基础学编程 #每日编程打卡

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      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:0.001077s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
      2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001471s ]
      3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000682s ]
      4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000685s ]
      5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001289s ]
      6. SELECT * FROM `set` [ RunTime:0.000611s ]
      7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001412s ]
      8. SELECT * FROM `article` WHERE `id` = 508674 LIMIT 1 [ RunTime:0.000921s ]
      9. UPDATE `article` SET `lasttime` = 1787313478 WHERE `id` = 508674 [ RunTime:0.006780s ]
      10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000669s ]
      11. SELECT * FROM `article` WHERE `id` < 508674 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000984s ]
      12. SELECT * FROM `article` WHERE `id` > 508674 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001293s ]
      13. SELECT * FROM `article` WHERE `id` < 508674 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003271s ]
      14. SELECT * FROM `article` WHERE `id` < 508674 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001521s ]
      15. SELECT * FROM `article` WHERE `id` < 508674 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004130s ]
      0.189128s