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

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.

CodePudding user response：

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="")

CodePudding user response：

You can use f-strings:

for i in range(1, height   1):
    print(f"{'#'*i: >{height}}")

Output:

Height: 4
   #
  ##
 ###
####

CodePudding user response：

if you don't want the spaces that comes before the "#" just make the code like 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("#" * i)