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How to generate an inverted equilateral triangle in Python

Vinisha Maheshwari

We can print a plethora of patterns using Python. The basic and only prerequisite is a good understanding of how loops work in Python. In this shot, we will use simple for loops to generate an inverted equilateral triangle using stars.

Description

A triangle is said to be equilateral if it has the same length on all three sides. An inverted equilateral triangle will be the inverted form of the same, with its vertex lying on the bottom, pointing downwards.

To execute this using Python programming, we will use two for loops nested within an outer for loop:

  • The outer loop will handle the number of rows and columns.
  • One inner loop will handle the initial spaces and the other inner loop will handle spaces in between the characters as well as printing the characters.

Code

Let us look at the code snippet below to understand this better.

# User Input for number of rows and columns (Length of Triangle)
num = 3

# Loop over number of rows and columns
for i in range(num, 0, -1):
    
    # Spaces across rows
    for j in range(0, num-i):
        print(end=" ")
    
    # Print spaced stars
    for j in range(0, i):
        print("*", end=" ")
    
    # Go to next line
    print()

Explanation

  • In line 2, the user gives input to specify the number of rows and columns, i.e., the length of the triangle

  • In line 5, we create an outer for loop to loop over the rows and columns

  • In lines 8 and 9, we create an inner for loop to print the initial spaces across the rows.

  • In lines 12 and 13, we create another inner loop to print the characters and spaces in between them.

  • In line 16, we use print() outside the inner loops but inside the outer loop to move to the next line.

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