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10分钟学会Python循环

  • 2026-02-05 10:56:47
10分钟学会Python循环
1.我们来学习如何使用while循环，我们使用循环来多次执行一段代码。While语句的结构是while条件：（一定冒号）。语句块执行时Python会判断条件是否成立。也就是true或false。如果条件成立，则执行后面的语句块儿，并进入下次循环；如果条件不成立，则结束没有循环。
2、我们定义一个变量：i = 1  写一个while语句，把条件设置成i <= 4，注意不要忘了冒号。语句块儿写print i  i=i+1
3、先模拟一下程序的执行流程，首先把1赋值量i，接下来执行while语句，先判断条件，条件是1 <= 4成立，所以执行后面的语句块print的函数会输出1，之后给变量i+1，变量i的值是2
4、进入下次循环:判断条件是否成立，现在是2 <= 4成立，所以执行后面的语句块输出2，并且把i赋值为3
5、再次判断条件，条件成立，输出3,i被赋值为4。
6、再次判断条件：条件成立，输出4,i赋值为5
7、再次判断条件：这里 5<= 4已经不成立了，所以while语句后面的语句块儿都不会被执行。While循环结束。
8、Python继续执行后面的语句，比如我们输出循环结束，执行程序与我们讲的一致：输出的是1~4循环。结束后运行了我们的输出语句“循环结束”
9、如果这里不写i=i+1会发生什么？
10、这个时候条件就会一直成立，也就是1 <= 4一直成立,循环就不会结束
11、下次再学习break是怎么终止循环的
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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:0.000744s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000867s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000343s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000994s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000488s ]
  6. SELECT * FROM `set` [ RunTime:0.000782s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000599s ]
  8. SELECT * FROM `article` WHERE `id` = 468641 LIMIT 1 [ RunTime:0.002261s ]
  9. UPDATE `article` SET `lasttime` = 1770505482 WHERE `id` = 468641 [ RunTime:0.004427s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000225s ]
  11. SELECT * FROM `article` WHERE `id` < 468641 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000445s ]
  12. SELECT * FROM `article` WHERE `id` > 468641 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000414s ]
  13. SELECT * FROM `article` WHERE `id` < 468641 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003650s ]
  14. SELECT * FROM `article` WHERE `id` < 468641 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.008108s ]
  15. SELECT * FROM `article` WHERE `id` < 468641 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006085s ]
0.175868s