Python Program to Print R Star Pattern

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

The below alphabet R 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 required positions to get the Alphabetical R pattern of stars and skip others.

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

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

Enter Alphabet R of Stars Rows = 9
====The Alphabet R Star Pattern====
 ******* 
*       *
*       *
*       *
******** 
*    *   
*     *  
*      * 
*       *

The Python code below reduced the number of else if conditions to print the Alphabet R pattern of stars. We have added extra spaces to make it (R) look better.

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

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

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

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

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

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

Enter Alphabet R of Stars Rows = 12
  * * * * * * * * * *   
*                     * 
*                     * 
*                     * 
*                     * 
*                     * 
* * * * * * * * * * *   
*             *         
*               *       
*                 *     
*                   *   
*                     * 

In this Python example, we created an RPattern function that accepts the rows and the symbol or character to print the Alphabet R pattern of the given symbol.

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


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

Enter Alphabet R of Stars Rows = 15
Symbol for R Star Pattern = @
  @ @ @ @ @ @ @ @ @ @ @ @ @   
@                           @ 
@                           @ 
@                           @ 
@                           @ 
@                           @ 
@                           @ 
@ @ @ @ @ @ @ @ @ @ @ @ @ @   
@               @             
@                 @           
@                   @         
@                     @       
@                       @     
@                         @   
@                           @