How to generate a hollow diamond pattern using letters in Python

This shot will discuss how to generate a hollow diamond pattern using letters of the alphabet in Python.

Numerous patterns can be printed using Python once we have a firm grip over the loops concepts. Here we will be using simple for loops to generate a hollow diamond pattern using letters of the alphabet in Python.

Description

To execute a diamond pattern using Python programming, we will be using 2 outer for loops, one for the upper triangle and the other for the lower triangle, and 4 nested loops to print the pattern.

Code

Let’s have a look at the code.

# Number of rows
row = 5
# Upper part of hollow diamond
for i in range(1, row+1):
    for j in range(1,row-i+1):
        print(" ", end="")
    for j in range(1, 2*i):
        ch = chr(64+i)
        if j==1 or j==2*i-1:
            print(ch, end="")
        else:
            print(" ", end="")
    print()
# Lower part of hollow diamond
for i in range(row-1,0, -1):
    for j in range(1,row-i+1):
        print(" ", end="")
    for j in range(1, 2*i):
        if j==1 or j==2*i-1:
            ch = chr(64+i)
            print(ch, end="")
        else:
            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).

  • In lines 5-14, we create a for loop to generate the upper triangle.

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

  • In lines 6-7, we create a for loop to handle the number of spaces.

  • In lines 8 to 14, we create a for loop to print the patterns.

    • ch is used to create letters from numbers by using the iterative value of i and the concept of ASCIIAmerican Standard Code for Information Interchange conversion. The starting value 64 + (i=1) has been used as ASCII value of A (starting the diamond is 65).
    • j==1 creates the left arm of the triangle.
    • j==2*i-1 creates the right arm of the triangle.
    • The end statement is used to stay on the same line.
    • The print() statement is used to move to the next line.

  • In lines 17-26, we create a for loop to generate the lower triangle.

  • In line 17, we create a for loop to handle the number of rows.

  • In lines 18-19, we create a for loop to handle the number of spaces.

  • In lines 20-26, we create a for loop to print the patterns.

    • ch is used to create letters from numbers by using the iterative value of i and the concept of ASCII conversion. The starting value 64 + (i=1), has been used as ASCII value of A (starting the diamond is 65).
    • j==1 creates the left arm of the triangle.
    • j==2*i-1 creates the right arm of the triangle.
    • The end statement is used to stay on the same line.
    • The print() statement is used to move to the next line.
Free AI Mock Interviews
Coding Interview
Coding PatternsFree Interview
Gain insights and practical experience with coding patterns through targeted MCQs and coding problems, designed to match and challenge your expertise level.
System Design
You TubeFree Interview
Learn to design a video streaming platform like YouTube by tackling functional and non-functional requirements, core components, and high-level to detailed design challenges.

Free Resources

Attributions:
  1. undefined by undefined
License: Creative Commons-Attribution-ShareAlike 4.0 (CC-BY-SA 4.0)