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Generate an inverted hollow left angled triangle using stars

Vinisha Maheshwari

In this shot, we will discuss how to generate an inverted hollow left angled triangle using stars in Python.

We can print a plethora of patterns using Python. The only prerequisite to do this is a good understanding of how loops work in Python. Here, we will be using simple for loops to generate an inverted hollow left-angled triangle using stars.

Description

A triangle is said to be left-angled if it has an angle equal to 90 degrees on its right side. An inverted left-angled triangle is just the inverted form of that, with its vertex lying on the bottom.

To execute an inverted left-angled triangle using Python programming, we will be using two for loops:

  • An outer loop: To handle the number of rows.
  • An inner loop: To handle the number of columns.

Code

Let’s look at the code snippet below.

# Number of rows
n = 5

# Loop through rows
for i in range(1,n+1):
    
    # Loop through columns
    for j in range(1, n+1):
        
        # Printing Pattern
        if (j==n) or (i==1) or (i==j):
            print("*", end=" ")
        else:
            print(" ", end=" ")
    print()  

Explanation

  • In line 2, we take the input for the number of rows (i.e., the length of the triangle).

  • In line 5, we create a for loop to iterate through the number of rows.

  • In line 8, we create an inner nested for loop to iterate through the number of columns.

  • From lines 11 to 14, we create the pattern using conditional statements. The end statement helps to stay on the same line.

  • In line 15, the print() statement is used to move to the next line.

In this way, we generate an inverted hollow left-angled triangle using stars in Python.

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