我如何在Python中创建一个递减的numberPyramid（num）？

问题描述

我试图创建一个如下图所示的金字塔（numberPyramid（6）），金字塔不是由数字组成的，而是实际上是一个黑色的空格。该函数接受一个名为num的参数，它是金字塔中的行数。我怎么去做这个？我需要使用for循环，但我不知道如何实现它。

  666666666666 
 55555 55555 
 4444 4444 $ b $ 333 333 
 22 22 
 1 1 
  

解决方案

  max_depth = int（raw_input（输入最大金字塔深度（2  -  9）：））
我在范围（max_depth，0，-1）：
 print str（i）* i +*（（max_depth-i）* 2）+ str（i）* i 
  
 
 
输出：
 
 
 （numpyramid ）macbook：numpyramid joeyoung $ python numpyramid.py 
输入金字塔的最大深度（2  -  9）：6 
 666666666666 
 55555 55555 
 4444 4444 
 333 333 
 22 22 
 1 1 
  
这是如何工作的：
 
 
 
 Python有一个名为的内置函数  range（） 它可以帮助您为 for-loop 构建迭代器。你可以通过传递 -1 作为第三个参数来减少递增，而不是递增。
 
 
我们的for循环将会从用户提供的 max_depth （我们的例子中为6）和 i 会为循环的每次迭代递减1 。
 
现在输出行应该执行以下操作：
 $ b $ ul 
 
打印出当前的迭代器编号（ i ）并重复 i 次。在中间添加多少空白。 
 
 
 
 
这将是max_depth减去当前迭代器数量，然后将结果乘以2，因为每次迭代需要将空白加倍。 > 
 
  
 
附加第二组重复的数字：当前的迭代器数量（ i ）重复 i 次数 
 
 
 
 
打印字符时，可以用星号 * 跟随字符来重复这些字符，以及字符的次数重复。 
例如：
 
 
 >>> ＃重复字符'A'5次
 ...打印A* 5 
 AAAAA 
  
 
I'm trying to create a pyramid that looks like the picture below(numberPyramid(6)), where the pyramid isn't made of numbers but actually a black space with the numbers around it. The function takes in a parameter called "num" and which is the number of rows in the pyramid. How would I go about doing this? I need to use a for loop but I'm not sure how I implement it. Thanks!
                                 666666666666
                                 55555  55555
                                 4444    4444
                                 333      333
                                 22        22
                                 1          1
 解决方案 
First the code: 
max_depth = int(raw_input("Enter max depth of pyramid (2 - 9): "))
for i in range(max_depth, 0, -1):
    print str(i)*i + " "*((max_depth-i)*2) + str(i)*i
Output:
(numpyramid)macbook:numpyramid joeyoung$ python numpyramid.py
Enter max depth of pyramid (2 - 9): 6
666666666666
55555  55555
4444    4444
333      333
22        22
1          1
How this works:
Python has a built-in function named range() which can help you build the iterator for your for-loop.  You can make it decrement instead of increment by passing in -1 as the 3rd argument.
Our for loop will start at the user supplied max_depth (6 for our example) and i will decrement by 1 for each iteration of the loop.
Now the output line should do the following:
Print out the current iterator number (i) and repeat it itimes.
Figure out how much white space to add in the middle.
This will be the max_depth minus the current iterator number, then multiply that result by 2 because you'll need to double the whitespace for each iteration
Attach the whitespace to the first set of repeated numbers.
Attach a second set of repeated numbers: the current iterator number (i) repeated itimes
When your print characters, they can be repeated by following the character with an asterisk * and the number of times you want the character to be repeated.For example:
>>> # Repeats the character 'A' 5 times
... print "A"*5
AAAAA
                        
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