Python Program to Print Hollow Inverted Triangle Star Pattern

This article shows how to write a Python Program to Print a Hollow Inverted Triangle Star Pattern using a for loop, while loop, and functions. This example uses the for loop and if else condition to iterate and print the Hollow inverted Triangle Star Pattern.

rows = int(input("Enter Hollow Inverted Triangle Pattern Rows = "))

print("====Hollow Inverted Triangle Star Pattern====")

for i in range(rows, 0, -1):
    for j in range(1, rows - i + 1):
        print(' ', end = '')
    for k in range(1, i * 2):
        if i == 1 or i == rows or k == 1 or k == i * 2 - 1:
            print('*', end = '')
        else:
            print(' ', end = '')       
    print()

Output.

This Python program replaces the above for loop with a while loop to print the Hollow Inverted Triangle Star Pattern.

rows = int(input("Enter Hollow Inverted Triangle Pattern Rows = "))

print("====Hollow Inverted Triangle Star Pattern====")

i = rows
while i > 0:
    j = 1
    while j < rows - i:
        print(' ', end = '')
        j = j + 1
    k = 1
    while k < i * 2:
        if i == 1 or i == rows or k == 1 or k == i * 2 - 1:
            print('*', end = '')
        else:
            print(' ', end = '')
        k = k  + 1
    i = i - 1
    print()

Output

Enter Hollow Inverted Triangle Pattern Rows = 12
====Hollow Inverted Triangle Star Pattern====
***********************
*                   *
 *                 *
  *               *
   *             *
    *           *
     *         *
      *       *
       *     *
        *   *
         * *
          *

In this example, we created a HolIowInvTriangle function that accepts the rows and characters to Print the Hollow Inverted Triangle Star Pattern. It replaces the star in the Hollow Inverted Triangle pattern with a given symbol.

def HolIowInvTriangle(rows, ch):
    for i in range(rows, 0, -1):
        for j in range(1, rows - i + 1):
            print(' ', end = '')
        for k in range(1, i * 2):
            if i == 1 or i == rows or k == 1 or k == i * 2 - 1:
                print('%c' %ch, end = '')
            else:
                print(' ', end = '')       
        print()


rows = int(input("Enter Hollow Inverted Triangle Pattern Rows = "))
ch = input("Symbol in Hollow Inverted Mirrored Right Triangle = ")

HolIowInvTriangle(rows, ch)

Output

Enter Hollow Inverted Triangle Pattern Rows = 14
Symbol in Hollow Inverted Mirrored Right Triangle = $
$$$$$$$$$$$$$$$$$$$$$$$$$$$
 $                       $
  $                     $
   $                   $
    $                 $
     $               $
      $             $
       $           $
        $         $
         $       $
          $     $
           $   $
            $ $
             $