loops - 如何阻止这种情况重复发生？

Question

我目前在初学者 python 类中，所以不要太用力....但是我根据随机生成的数字做文本模式，目前面临一个我无法弄清楚的问题

if random_num > 0:
        for j in range(random_num):
            for i in range(random_num):
                print("*"*(random_num-i))
            print()

这是我的代码的一部分，它根据已经生成的随机数创建三角形图案。我运行的结果是：

Do you wish to print another pattern (y/n)? y
Random Number:  4
****
***
**
*

****
***
**
*

****
***
**
*

****
***
**
*
````````````````````````````````````````````````````````````````````````````````````````````````````````
it prints the triangle how I want it by taking one off after every row but as you can see it prints itself same amount of times as number generated. anyone have any imput? also I cannot use "break"

Answer 1

随机数 = 4

while random_num > 0:
  print('*'*random_num)
  random_num -= 1

将 while 循环视为一个 if 语句，它不断重复循环，直到条件不满足。

Answer 2

您不需要两个 for 循环。

一个循环将打印 n 行，其中 n 是 random_number。每行将有 n - i 个星号，其中 i 是行的索引——这是因为您将星号乘以 (random_number-1)。所以第 0 行将有 n - 0 = n 颗星，然后下一行将有 n - 1 颗星，依此类推。