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0基础学python(3)

  • 2026-02-05 06:20:18
0基础学python(3)
今天我们来学习循环。循环分为两种，for循环和while循环，我们先学while循环
while循环的结构是这样的：
while x:  pass
重复执行，直到x为假。
但是你写了这一串代码：
while Ture:  print("111")
但是你发现这是个死循环，于是你发现了这两个模块continue和break。break:跳出循环。
continue：跳出本次循环剩余部分，立即开始下一次循环。pass：是占位符。
我们也可以用for循环：
for i in range(x):  pass
i被定义为变量，第几次循环就是几，循环x次。想让i变得更好，可以把后面的x改成（开始，结束+1，步长）。
在他们俩的后面都可以加else，意思是循环为被跳出且执行完毕后执行。
下期预告：注释与导入
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  1. CONNECT:[ UseTime:0.000408s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000625s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.100651s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.100661s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000546s ]
  6. SELECT * FROM `set` [ RunTime:0.100536s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000634s ]
  8. SELECT * FROM `article` WHERE `id` = 463196 LIMIT 1 [ RunTime:0.051366s ]
  9. UPDATE `article` SET `lasttime` = 1770540645 WHERE `id` = 463196 [ RunTime:0.007715s ]
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