颠倒的星号三角形 [英] Reverse upside-down asterisk triangle

问题描述

我正在尝试使用嵌套的for循环向用户询问整数，然后程序将输出一个倒置的倒置三角形，其底数带有星号，然后逐渐减小。
应该看起来像这样：

I am trying to use nested for loops to ask the user for an integer and then the program will output a reverse, upside-down triangle, with the base of it having the number of asterisks and working its way down. It's supposed to look like this:

*****
 ****
  ***
   **
    *

我拥有的代码：

def pattern():
  integer = requestInteger("Please enter a number")
  for number in range(0, integer):
    for variable in range(integer, 0, -1):
      if variable - 1 > number:
        sys.stdout.write(' ')
      else:
        sys.stdout.write('*')
  sys.stdout.write('\n')

输出以下内容：

    *
   **
  ***
 ****
*****

我不太确定如何更改for循环来完成这项工作，并且我已经尝试了一段时间，所以会有所帮助非常感谢。

I'm not really sure how to go about changing my for loops around to make this work, and I've been trying for a while, so help would be much appreciated.

推荐答案

我的想法是这样的：

def pattern():
    integer = int(raw_input("Please enter a number"))
    for number in range(0, integer):
        print " " * number + "*" * (integer - number)

这是作业吗（嵌套循环是必需的）？提示： * 运算符可以很容易地由 for 循环替换。

Is this homework (nested loops are mandatory)? Hint: the * operator can be easily replaced by a for loop.

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