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How to generate an inverted hollow triangle using asterisks

Vinisha Maheshwari

In this shot, we will discuss how to generate an inverted hollow equilateral triangle using asterisks in Python.

We can print a plethora of patterns using Python. A prerequisite for doing so is having a good understanding of loops.

Here, we will be using simple for loops to generate the inverted triangle.

Description

A triangle is said to be equilateral if all three sides are of the same length. An inverted equilateral triangle is an upside-down triangle with equal sides.

To execute it using Python, we will be using two for loops nested within an outer for loop:

  • An outer loop to handle the number of rows and columns.
  • Two inner loops, one to handle the initial spaces, and the other to handle spaces in between the characters, as well as to print the characters.

Code

Let’s look at the code snippet below.

def inverted_hollow_triangle(n):
    
    # Loop over number of rows and columns
    for i in range(n):
        
        # Spaces across rows
        for j in range(i):
            print(" ", end="")
            
        # Conditions for creating the pattern
        for k in range(2*(n-i)-1):
            if k==0 or k==2*(n-i-1) or i==0:
                print("*", end="")
            else:
                print(" ", end="")
        print()
        
inverted_hollow_triangle(9)

Explanation

  • In line 4, we create a loop to iterate over the number of rows.

  • In lines 7 and 8, we create a loop that gives the initial spaces (before characters) across each row.

  • In lines 11 to 15, we create another inner loop to form the given pattern.

  • In lines 13 to 15, we specify that whenever the condition for either being the left asterisk or the right asterisk is met, a * is printed. In case the conditions aren’t met, we print empty spaces.

  • In line 16, the print() statement is used to move to a new line.

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