Hollow Diamond Pattern in Python

In this article, you will learn how to print the Hollow Diamond Pattern using the Python programming language. Such a type of logical question is generally asked in programming interviews or on a competitive exams. This can be helpful to improve your logical programming skills and is useful in game development and other logical application development.

The following Python program prints a Hollow Diamond Pattern made up of stars up to the specified n lines. In this Python program, we take the row number as input from the client. Here, the row demonstrates the number of lines that will be printed in one triangle shape of the Hollow Diamond design. If we have a row value of 7 as input, the total number of lines in the hollow diamond pattern will be 13.

Hollow Diamond Pattern Python Program using for loop and while loop

The given Python program uses nested for loops, while loops and an if-else statements to return the hollow diamond pattern.

# Hollow diamond pattern program
  
def hollowDiamondPattern(n) : 
    k = 0; 
  
    # Upper triangle shape
    for i in range(1,n+1) : 
  
        # Print spaces 
        for j in range(1,n-i+1) : 
            print(" ",end="") 
              
        # Print * 
        while (k != (2 * i - 1)) : 
            if (k == 0 or k == 2 * i - 2) : 
                print("*",end="") 
            else : 
                print(" ",end="") 
            k = k + 1
              
        k = 0
  
        # move to next row 
        print(""), 
      
    n = n - 1
  
    # Lower triangle shape 
    for m in range (n,0,-1) : 
        # Print spaces 
        for p in range(0,n-m+1) : 
            print(" ",end="") 
              
        # Print *
        k = 0
        while (k != (2 * m - 1)) : 
            if (k == 0 or k == 2 * m - 2) : 
                print("*",end="") 
            else : 
                print(" ",end="") 
            k = k + 1
          
        print(""), 
              
# Input number of rows
row = int(input('Enter number of row: '))

hollowDiamondPattern(row) 

We will get the following output of the above code-

Hollow Diamond Pattern Python Program using only for loop

The given Python program uses nested for loops, and if-else statement to return the hollow diamond pattern.

# Hollow diamond pattern program
  
rows = int(input("Enter number of rows : "))

print("Hollow Diamond Pattern")

# Upper triangle shape
for i in range(1, rows + 1):
    for j in range(1, rows - i + 1):
        # print spaces 
        print(end = ' ')
    for k in range(1, 2 * i):
        if k == 1 or k == i * 2 - 1:
            # print spaces 
            print('*', end = '')
        else:
            # move to next row 
            print(' ', end = '')
    print()

# Lower triangle shape 
for i in range(rows - 1, 0, -1):
    for j in range(1, rows - i + 1):
        # print spaces 
        print(' ', end = '')
    for k in range(1, 2 * i):
        if k == 1 or k == i * 2 - 1:
            # print spaces 
            print('*', end = '')
        else:
            # move to next row 
            print(' ', end = '')
    print()

We will get the following output of the above code-

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