I just started a python course in my university and need help solving an exercise. It is asking me to write a Christmas_tree(h,n,s) function that draws a christmas tree with the "*" character. The exercise requires to have a

• h: height level, number of lines in each level of the tree
• n: number of levels
• s: shifts in between each level of the tree and the next level in number of "*"

ex. Christmas_tree(5,4,2) will be represented as such:

>Solution :

Use two nested loops to handle the levels and the changes within each level, and use the str.center method to center each row.

>>> def christmas_tree(h, n, s):
...     max_width = 1 + 2 * h * n
...     width = 1
...     for _ in range(n):
...         for _ in range(h):
...             print(("*" * width).center(max_width))
...             width += 2
...         width -= 2 * s
...
>>> christmas_tree(5, 4, 2)
                    *
                   ***
                  *****
                 *******
                *********
                 *******
                *********
               ***********
              *************
             ***************
              *************
             ***************
            *****************
           *******************
          *********************
           *******************
          *********************
         ***********************
        *************************
       ***************************