如何阻止这种重复?

Question

我目前在一个初学者python类，所以不要bash太辛苦....但我做基于随机生成的数字的文本模式，目前我面临一个问题，我不能弄清楚

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

是我的代码的一部分，它创建了一个基于已经生成的随机数的三角形图案。我运行这个命令的结果是:

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

你不需要两个for循环。

一个循环将打印n行，其中n为random_number。每一行将有n - i个星号，其中i是该行的索引——这是因为您将星号乘以(random_number-1)。因此，第0行将有n - 0 = n颗星，然后下一行将有n - 1颗星，以此类推。

Answer 2

random_num = 4

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

把while循环看作if语句，它不断重复循环，直到条件不满足为止。