Python Exercise: Construct a specified pattern, using a nested for loop

Last update on December 21 2024 09:13:23 (UTC/GMT +8 hours)

Write a Python program to construct the following pattern, using a nested for loop.

* 
* * 
* * * 
* * * * 
* * * * * 
* * * * 
* * * 
* * 
*

Pictorial Presentation:

Sample Solution:

Python Code:

# Set the value of 'n' to 5 (this will determine the number of lines in the pattern)
n = 5

# Iterate through the range of numbers from 0 to 'n' (exclusive)
for i in range(n):
    # Iterate through the range of numbers from 0 to 'i' (exclusive) for each 'i' in the outer loop
    for j in range(i):
        # Print '*' followed by a space without a new line (end="" ensures printing in the same line)
        print('* ', end="")
    # Move to the next line after printing '*' characters for the current 'i'
    print('')

# Iterate through the range of numbers from 'n' down to 1 (inclusive), decreasing by 1 in each iteration
for i in range(n, 0, -1):
    # Iterate through the range of numbers from 0 to 'i' (exclusive) for each 'i' in the outer loop
    for j in range(i):
        # Print '*' followed by a space without a new line (end="" ensures printing in the same line)
        print('* ', end="")
    # Move to the next line after printing '*' characters for the current 'i'
    print('') 
	

Sample Output:

*                                                                                                             
* *                                                                                                           
* * *                                                                                                         
* * * *                                                                                                       
* * * * *                                                                                                     
* * * *                                                                                                       
* * *                                                                                                         
* *                                                                                                           
* 

Flowchart:

Python Code Editor:

Have another way to solve this solution? Contribute your code (and comments) through Disqus.

Previous: Write a Python program to guess a number between 1 to 9.
Next: Write a Python program that accepts a word from the user and reverse it.