print() go wrong when multiple a string by any number, why does that happen?

when I use print() for string multiplication, it prints out an extra space (" ") at the beginning of each line. Strange. Anyone could explain why?

I was writing a Mario program with python. The program should run like this

$ python mario.py
Height: 4
   #
  ##
 ###
####

And this is my code

import cs50

while True:
    height = cs50.get_int("Height: ")
    if height > 0 and height < 9:
        break

for i in range(1, height + 1):
    print( " " * (height - i), "#" * i)

while the result gives me this

~/ $ python mario.py
Height: 4
    #
   ##
  ###
 ####

As you can see, each line has additional space in the front which shouldn’t even exist.

>Solution :

print separates its arguments with space, your calculations are right but there’s an added space.
change it to this:

import cs50

while True:
    height = cs50.get_int("Height: ")
    if height > 0 and height < 9:
        break

for i in range(1, height + 1):
    print( " " * (height - i), "#" * i, sep="")