Pyramid of stars using while loops python nested while loops

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I have been having trouble with something I am working on for the past two days trying to make a pyramid of stars using while loops from user input

an example of the final result would look like this:

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

but I am not even clearly sure how this is supposed to work. As I have tried for the past two nights to figure this problem out.

This is all I have so far:

userInput = int(input("Please enter the amount of rows: "))
count = 1
spacing = 0
actualStars = "*"
numberStars = 0
rows = 0
while(userInput <= rows):
    rows += count
    print()
    while(spacing <= userInput):
        spacing += count
        print(" ")
        while(numberStars <= 0):
            print(actualStars)

Since this is homework, rather than give you a code answer, I'll give you an outline of how this should work. Given the constraint of three loops, here is what seems to be expected:

  1. The first, outer loop should iterate over the rows. The first pass generates the first row, the second pass generates the second row, etc.

  2. The second loop is nested inside the first loop. It generates the leading spaces for the current row.

  3. The third loop is also nested inside the first loop, but not the second. It is executed after the second loop, and should follow it in your code. It generates the stars for the current row.

Each of these loops is very simple and you should have no trouble with them. The only tricky part is getting print to print a string without following it with a newline character (which ends the current line). If you're using Python 3, you can do this with print("abc", end="") This will print the string abc but will not end the line. After the third loop, you will need to end the line, which you can do with print().

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So, let's approach this arithmetically. The first row needs one star, the second row needs two stars, and the third row needs three stars, etc.

In other words the number of stars is equal to the current row index (assuming you start your index at 1). Python's string format method allows you to specify centered strings and you can multiply the stars by the row index, since strings in Python implement the multiplication protocol mul:

i = 0
rows = 8
while i <= rows:
  print("{:^8}".format("*"*i))
  i += 1

This will output the following:

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

As you can see, it's a little lopsided, but we're on the right track. It's lopsided because the number of 'columns' is even, and when there's an odd number of stars, they can't be centered. The exact opposite would occur if we had an odd number of columns.

So, how do we center these? There are a few ways to approach it, but I would just make every row of stars odd by printing a space between every star. At this point they are perfectly centered.

All you need to do is add another two loops that:

1) Replicate the format() template's white space padding

2) Create the 'true' centered string by putting a space between stars

This could be done with three while loops, but I don't see how that's pythonic. But I didn't write the assignment :)

hth

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userInput=int(input("Please enter the amount of rows:"))
row=""
count =1
spacing =0
star=0
u=0
while(count <=userInput):
    spacing =spacing +count 
    while(spacing<userInput):
        row+=" "
        spacing +=1
    star=count +u
    while(star>0):
        row+="*"
        star-=1
    count +=1
    spacing=0
    u+=1
    print(row)
    row*=-1

Using nested while loop to print pyramid of stars, Hi All, I am learning python using Python 3.6.1 by online complier. I have a doubt about the below pyramid program. To print star pyramid patterns in C++ programming, we have used two nested for loops.. The outer for loop is responsible for the number of rows in star (*) pyramid triangle or patterns whereas inner for loop will print the required number of stars * in each row.

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Comments
  • Is this a homework assignment? And does it specifically say that you need to use while loops?
  • yes it specifies 3 while loops
  • I would first take a look at your conditions.
  • Forget the spaces for a second. Are you able to just print 1 star, then 2 stars, etc..?
  • Hint: in python, you can write a = '*' * 10 which does the same as a='**********'. You can also concatenate strings b='X' * 3 + 'O' * 4 is equivalent to b='XXXOOOO'. You therefore need only one loop. So each line prints a sequence of spaces followed by another sequence of starts. Just figure how many of each you have to print on each line. (Unless your assignment specifically asks for multiple loops, of course)
  • @TomKarzes OP obviously had an attempt, The question was not "give me code". I also explained what OP was doing wrong, so this isn't a "code only" answer
  • The wonky pyramid of stars :D.
  • The number of stars should increase by 2 on each row, not 1
  • The way to work the pyramid Najob using String.The excuse is if there is a failure to explain the code
  • While this might answer the authors question, it lacks some explaining words and/or links to documentation. Raw code snippets are not very helpful without some phrases around them. You may also find how to write a good answer very helpful. Please edit your answer - From Review