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How to generate a hollow right-angled triangle in Python

Vinisha Maheshwari

In this shot, we will discuss how to generate a hollow right-angled triangle with stars in Python.

We can print a plethora of patterns with Python. The basic and only prerequisite is a good understanding of how loops work in Python.

Here, we will use simple for loops to generate a hollow right-angled triangle with stars.

Description

A triangle is said to be right-angled if it has an angle equal to 90 degrees on its left side.

We will use 2 for loops:

  • Outer loop: To handle the number of rows.
  • Inner loop: To handle the number of columns.
# 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 (i == j) or (j == 1) or (i == n):
            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 4, we create a for loop to iterate through the number of rows.

  • In line 6, we create an inner nested for loop to iterate through the number of columns.

  • From lines 8 to 11, we use conditional statements to create the pattern. The end statement helps to stay on the same line.

  • In line 12, we use the print() statement to move to the next line.

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