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Python学习记录8——循环语句

  • 2026-08-22 00:14:32
Python学习记录8——循环语句
循环语句：可以让代码重复执行。
一、while循环（死循环多用）
while 条件：
      代码
判断条件是否为真，如果真，执行代码，再次判断条件，直到条件循环为假。
二、break：让当前循环立即停止
三、continue：停止执行本次循环，继续执行下一次循环
四、for循环（多用）
语法：
for 变量 in 可迭代的东西：
      代码
作用：把可迭代的东西中每一项内容拿出来，挨个赋值给变量，每一个变量每一次赋值都有执行一次循环体（代码）。
for循环计数，需要借助range
range(n)：从0数到n，不包含n
range（m，n）：从m数到n，不包含n
range（m，n，s）：从m数到n，不包含n，每次间隔为s
while也可以实现间隔数数。
五、pass：代码占位作用
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  1. CONNECT:[ UseTime:0.000803s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001381s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000688s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000643s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001233s ]
  6. SELECT * FROM `set` [ RunTime:0.000593s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001447s ]
  8. SELECT * FROM `article` WHERE `id` = 511751 LIMIT 1 [ RunTime:0.000934s ]
  9. UPDATE `article` SET `lasttime` = 1787341477 WHERE `id` = 511751 [ RunTime:0.002262s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000684s ]
  11. SELECT * FROM `article` WHERE `id` < 511751 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001153s ]
  12. SELECT * FROM `article` WHERE `id` > 511751 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000969s ]
  13. SELECT * FROM `article` WHERE `id` < 511751 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004397s ]
  14. SELECT * FROM `article` WHERE `id` < 511751 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002884s ]
  15. SELECT * FROM `article` WHERE `id` < 511751 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002964s ]
0.135503s