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How to generate a diamond pattern using stars in Python

Vinisha Maheshwari

In this shot, we will discuss how to generate a diamond pattern using stars in Python. Numerous patterns can be printed using python, once we have a strong understanding of loops. Here we will be using simple for loops to generate a diamond pattern using stars.

Description

To execute the same using Python programming, we will be using 2 outer for loops and 4 nested loops to print the pattern:

  • Outer loops: One is used for the upper triangle, while the other is used for the lower triangle.
  • Nested loops: These are used to print the exact pattern.

Code

Let’s take a look at the code snippet below.

# Number of rows
rows = 5

# Upper Triangle
k = 2 * rows - 2

# Outer loop to handle number of rows
for i in range(rows):
    
    #Inner loop to handle number of spaces
    for j in range(k):
        print(end=" ")
    k = k - 1
    
    #Inner loop to print patterns
    for j in range(0, i + 1):
        print("*", end=" ")
    print("")

    
# Lower Triangle   
k = rows - 2

# Outer loop to handle number of rows
for i in range(rows, -1, -1):
    
    #Inner loop to handle number of spaces
    for j in range(k, 0, -1):
        print(end=" ")
    k = k + 1
    
    #Inner loop to print patterns
    for j in range(0, i + 1):
        print("*", end=" ")
    print("")

Explanation

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

  • From lines 5 to 18, we create a for loop to generate the upper triangle.

  • In line 8, we create a for loop to handle the number of rows.

  • In lines 11 to 13, we create a loop to handle the number of spaces.

  • In lines 16 to 18, we create a loop to print the patterns.

  • From lines 22 to 35, we create a for loop to generate the lower triangle.

  • In line 25, we create a for loop to handle the number of rows.

  • In lines 28 to 30, we create a loop to handle the number of spaces.

  • In lines 33 to 35, we create a loop to print the patterns.

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