def staircase(n):
    for i in range(1, n+1):  # starts in '1' until 'i' is equal to 'n+1'
        print(' '*(n-i)+"#"*i)
        ''' adds a number of spaces equal to 'n-i'.
         Let's say if the number of the input (n) is '5',
         on the first iteration, 'i' will have the '1'
         value, wich by the syntax (n-i), it will print
         '4' spaces in total (' '*4).
         The same logic is applied to '#', it will print
         '#' based on the value of 'i' and since it is
         a string, it will always concatenate to the
         end of the string. '''