Draw a triangle using a nested loop

Question

I am using nested loops to create a reverse triangle that goes down by whatever character amount I enter. For example, if 8 is entered, my triangle is supposed to look like this

xxxxxxxx
 xxxxxxx
  xxxxxx
   xxxxx
    xxxx
     xxx
      xx
       x

My code currently consists of whats below, but the output is not what I was looking for.

row = 1
while row <= size:
    # Output a single row
    col = size - row + 1
    while col <= size:
        # Output the drawing character
        print(end=' ')

        # The next column number
        col = col + 1
    col = 0
    while col <= size - row:
        print(drawingChar, end=' ')
        col = col + 1
    row = row + 1
    print()   
print()

Output:

 x x x x x x x x 
  x x x x x x x 
   x x x x x x 
    x x x x x 
     x x x x 
      x x x 
       x x 
        x

Im sure i screwed up something minor with my <= size or col somewhere. All input is appreciated.

possible duplicate of reverse upside down asterisk triangle in python — chickity china chinese chicken
– chickity china chinese chicken, Commented Apr 3, 2017 at 21:44
@downshift i saw that post, and took some things from that answer, but im still getting that down pointing equilateral triangle — Astonishing
– Astonishing, Commented Apr 3, 2017 at 21:45
ok sorry that one wasn't helpful. Try removing the <space> character from the end parameter in the second while loop: print(drawingChar, end='') — chickity china chinese chicken
– chickity china chinese chicken, Commented Apr 3, 2017 at 21:51
Yes, @Astonishing, it's just that one space character in end=' ') that you should remove, that's all — chickity china chinese chicken
– chickity china chinese chicken, Commented Apr 3, 2017 at 21:53

pkacprzak · Accepted Answer · 2017-04-03 21:54:05Z

1

>>> def foo(n):
...    for i in range(n):
...       print((" "*i) + ("x"*(n-i)))
... 
>>> foo(8)
xxxxxxxx
 xxxxxxx
  xxxxxx
   xxxxx
    xxxx
     xxx
      xx
       x

Edit:

Since OP is asking for nested loop solution, here it is:

>>> def foo(n):
...    out = ""
...    for i in range(n):
...       for _ in range(i):
...          out += " "
...       for _ in range(n-i):
...          out += "x"
...       out += "\n"
...    print(out)
... 
>>> foo(8)
xxxxxxxx
 xxxxxxx
  xxxxxx
   xxxxx
    xxxx
     xxx
      xx
       x

edited Apr 3, 2017 at 21:54

answered Apr 3, 2017 at 21:42

pkacprzak

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4 Comments

Astonishing Over a year ago

I need to do it the way I am doing it with nested loops

pkacprzak Over a year ago

@Astonishing then convert my solution to use nested loops, however, there is no point to do that in general.

Astonishing Over a year ago

I am in an intro python class and have to use nested loops and I have absolutely no idea what any of what you gave me means. I think the code i provided is very close to what im trying to accomplish

pkacprzak Over a year ago

@Astonishing I added nested loops solution to my answer, check it out

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