Python Program to Print J Star Pattern

This article shows how to write a Python program to print the Alphabet J star pattern using the for loop, while loop, and functions with an example. 

The below alphabet J star pattern example accepts the user-entered rows, and the nested for loop iterates the rows. The elif condition is to print stars at a few positions to get the Alphabetical J pattern of stars and skip others.

rows = int(input("Enter Alphabet J of Stars Rows = "))
print("====The Alphabet J Star Pattern====")

for i in range(rows):
    for j in range(rows):
        if i == rows - 1 and (0 < j < rows - 1):
            print("*", end="")
        elif (j == rows - 1 and i != rows - 1) or (i > rows // 2 and j == 0 and i != rows - 1):
            print("*", end="")
        else:
            print(end=" ")
    print()

The Python code below uses the if else statement to print the Alphabet J pattern of stars in more straight lines.

rows = int(input("Enter Alphabet J of Stars Rows = "))

for i in range(rows):
    for j in range(rows):
        if (i == 0 or j == rows // 2) or (i == rows - 1 and j <= rows // 2):
            print("*", end="")
        else:
            print(end=" ")
    print()

Enter Alphabet J of Stars Rows = 13
*************
      *      
      *      
      *      
      *      
      *      
      *      
      *      
      *      
      *      
      *      
      *      
*******  

Python program to print the Alphabet J Star pattern using while loop

Instead of a For loop, this program uses the while loop to iterate the Alphabet J pattern rows and prints the stars at each position. For more Star Pattern programs >> Click Here.

rows = int(input("Enter Alphabet J of Stars Rows = "))

i = 0
while i < rows:
    j = 0
    while j < rows:
        if i == rows - 1 and (0 < j < rows - 1):
            print("*", end="")
        elif (j == rows - 1 and i != rows - 1) or (i > rows // 2 and j == 0 and i != rows - 1):
            print("*", end="")
        else:
            print(end=" ")
        j = j + 1
    print()
    i += 1

Enter Alphabet J of Stars Rows = 9
        *
        *
        *
        *
        *
*       *
*       *
*       *
 ******* 

In this Python example, we created a JPattern function that accepts the rows and the symbol or character to print the Alphabet J pattern of the given symbol.

def JPattern(rows, ch):
    for i in range(rows):
        for j in range(rows):
            if i == rows - 1 and (0 < j < rows - 1):
                print('%c' %ch, end='')
            elif (j == rows - 1 and i != rows - 1) or (i > rows // 2 and j == 0 and i != rows - 1):
                print('%c' %ch, end='')
            else:
                print(end=" ")
        print()


row = int(input("Enter Alphabet J of Stars Rows = "))
sy = input("Symbol for J Star Pattern = ")
JPattern(row, sy)

Enter Alphabet J of Stars Rows = 14
Symbol for J Star Pattern = @
             @
             @
             @
             @
             @
             @
             @
             @
@            @
@            @
@            @
@            @
@            @
 @@@@@@@@@@@@