while 循环
- 只要循环语句中的条件布尔值为True ，就会不停的执行下面的代码块 命令。
- while循环是无边界循环，for in 循环是有边界循环
- 和 if 语句的相似点都是检查一个布尔表达式的真假，if 语句是执行一次，while 循环是执行完跳回到while 顶部，如此重复，直到布尔值为假False
- 尽量少用 while 循环，大部分时候用 for in 循环是更好选择
1 i = 0 # 第一种while 循环 写法
2 numbers = [] # 把空数组赋值给变量numbers
3
4 while i < 6: # 进入while 循环 当i<6:
5 print(f'At the top is {i}') # 打印 i的头部数
6 numbers.append(i) # 变量numbers 尾部追加 i 数字
7
8 i+=1 # i 每次自增1
9 print("Numbers now:",numbers) # 记得加逗号//打印 数组现在：
10 print(f"At the bottom is {i}") # 打印 i的底部数
11
12 print("The numbers :") # 打印 这个数字是：
13 for num in numbers: # 用for循环来循环数组numbers
14 print(num) # 打印 num 变量
15
16
17
18
19 shuzu = [] # 第二种for in 循环语句改写
20
21 for t in range(0,6):
22 print(f"top of t:{t}")
23 shuzu.append(t)
24 print(f"shuzu:",shuzu)
25 t+=1
26 print(f"bottom of t:{t}")
27
28 print(f"The shuzu:")
29 for shu in shuzu:
30 print(shu)
PS C:\Users\Administrator\lpthw> python ex33.py At the top is 0 Numbers now: [0] At the bottom is 1 At the top is 1 Numbers now: [0, 1] At the bottom is 2 At the top is 2 Numbers now: [0, 1, 2] At the bottom is 3 At the top is 3 Numbers now: [0, 1, 2, 3] At the bottom is 4 At the top is 4 Numbers now: [0, 1, 2, 3, 4] At the bottom is 5 At the top is 5 Numbers now: [0, 1, 2, 3, 4, 5] At the bottom is 6 The numbers : 0 1 2 3 4 5 top of t:0 shuzu: [0] bottom of t:1 top of t:1 shuzu: [0, 1] bottom of t:2 top of t:2 shuzu: [0, 1, 2] bottom of t:3 top of t:3 shuzu: [0, 1, 2, 3] bottom of t:4 top of t:4 shuzu: [0, 1, 2, 3, 4] bottom of t:5 top of t:5 shuzu: [0, 1, 2, 3, 4, 5] bottom of t:6 The shuzu: 0 1 2 3 4 5
标签：笨办法,bottom,33,top,shuzu,while,循环,习题,now From： https://www.cnblogs.com/luxiaoli/p/17760495.html