Alphabet Pattern Programs in Python

Patterns are a valuable exercise for enhancing logical thinking and coding skills. Using loops in Python, we can create diverse alphabetical patterns like stars, squares, pyramids, and triangles. In this discussion, we’ll explore Python programs for printing these patterns using simple iteration and for loops. Before printing Python patterns, know ASCII: each alphabet corresponds to an ASCII value (e.g., A is 65). Uppercase (A-Z) values range from 65 to 90, and lowercase (a-z) from 97 to 122. Use `chr()` to print an alphabet via its ASCII value, like ‘A’ with ASCII 65.

What is an Alphabet Pattern?

An Alphabetic pattern is a visual arrangement of alphabets, whether uppercase or lowercase, presented in an aesthetically pleasing manner. These patterns can take on various predefined shapes such as squares, triangles, or even stars. Moreover, the customization of these patterns extends to choosing how they are filled.

Print Alphabet Pattern Programs in Python

Below are the Alphabet pattern programs in Python which we can print in Python.

Left Triangle Alphabet Pattern in Python

In this example, below Python code creates a function, `left_triangle_pattern`, to print a left-angled triangle of uppercase letters based on the specified number of rows. After defining the function, it sets the row count to 7 and calls the function to generate the desired pattern.

Python3

#define a function
def left_triangle_pattern(rows):
    #goes to new lines
    for i in range(rows):
        #print characters in current line
        for j in range(i + 1):
            print(chr(j + 65), end="")
        print()

#no of rows to span
n = 7

#call the function
left_triangle_pattern(n)

Output

A
AB
ABC
ABCD
ABCDE
ABCDEF
ABCDEFG

Space Complexity: O(1)
Time Complexity: O(n^2)

Right Triangle Alphabet Pattern in Python

In this example, below The Python code defines the function `right_triangle_pattern` to print a right-angled triangle of uppercase letters. It uses nested loops to manage line breaks, leading spaces, and character printing. The code sets the row count to 7 and calls the function to generate the pattern.

Python3

#define the function
def right_triangle_pattern(rows):
    #changes lines
    for i in range(rows):
        #adds spaces
        for j in range(1, rows - i):
            print(" ", end="")
        # prints characters
        for k in range(i + 1):
            print(chr(65 + k), end="")
        print()

#rows to be spanned
n = 7

#call the function
right_triangle_pattern(n)

Output

      A
     AB
    ABC
   ABCD
  ABCDE
 ABCDEF
ABCDEFG

Space Complexity: O(1)
Time Complexity: O(n^2)

Hollow Triangle Alphabet Pattern in Python

In this example, below given Python code defines a function `hollow_left_triangle` to print a hollow left-angled triangle pattern of uppercase letters. It uses nested loops, with the outer loop managing lines and the inner loop controlling character printing, including spaces for the hollow effect. The code sets the number of rows to 7 .

Python3

#define function
def hollow_left_triangle(rows):

    #change rows
    for i in range(1, rows+1):
        counter = 0
        for j in range(i):
            # print characters at the end and start
            if j == 0 or j == i-1:
                print(chr(65 + counter), end='')
                counter += 1
            else:
                # print spaces in between
                if i != rows:
                    print(' ', end='')
                # print characters in the last row
                else:
                    print(chr(65 + counter), end='')
                    counter += 1
        print()

#rows to be spanned
n = 7

#call the function
hollow_left_triangle(n)

Output

A
AB
A B
A  B
A   B
A    B
ABCDEFG

Space Complexity: O(1)
Time Complexity: O(n^2)

Pyramid Alphabet Pattern in Python

In this example, below Python code defines a function `pyramid_pattern` to print a pyramid pattern of uppercase letters. It utilizes nested loops, with the first loop managing spaces before each line, and the second loop controlling the printing of an odd number of characters. The code then sets the number of rows to 7.

Python3

#define the function
def pyramid_pattern(rows):
    for i in range(rows):
        # prints spaces
        for j in range(rows - i - 1):
            print(' ', end='')

        # prints odd number of characters
        for k in range(2 * i + 1):
            print(chr(65 + k), end='')

        print()

#rows to be spanned
n = 7

#call the function
pyramid_pattern(n)

Output

      A
     ABC
    ABCDE
   ABCDEFG
  ABCDEFGHI
 ABCDEFGHIJK
ABCDEFGHIJKLM

Space Complexity: O(1)
Time Complexity: O(n^2)

Upside Down Pyramid Alphabet Pattern in Python

In this example, below Python code defines a function `reverse_pyramid` to print a reversed pyramid pattern of uppercase letters. It uses nested loops, with the first loop managing spaces before each line, and the second loop controlling the printing of an odd number of characters. The code then sets the number of rows to 7 .

Python3

#define the function
def reverse_pyramid(rows):
    for i in range(rows):
        # prints spaces
        for j in range(i):
            print(' ', end='')

        # prints an odd number of characters in each row
        for j in range(2 * (rows - i) - 1):
            print(chr(65 + j), end='')

        print()

#rows to be spanned
n = 7

#call the function
reverse_pyramid(n)

Output

ABCDEFGHIJKLM
 ABCDEFGHIJK
  ABCDEFGHI
   ABCDEFG
    ABCDE
     ABC
      A

Space Complexity: O(1)
Time Complexity: O(n^2)

Hollow Pyramid Alphabet Pattern in Python

In this example , below Python code defines a function `hollow_pyramid` to print a hollow pyramid pattern of uppercase letters. It uses nested loops, with the first loop managing spaces before each line, and the second loop controlling the printing of characters. The function includes conditions to print characters only at the start and end of each row, as well as in the last row for the hollow effect.

Python3

#define the function
def hollow_pyramid(rows):
    for i in range(rows):
        #print spaces
        for j in range(rows - i - 1):
            print(' ', end='')

        #print characters
        counter = 0
        for k in range(2 * i + 1):
            #print characters only in the start and end of row
            if k == 0 or k == 2 * i:
                print(chr(65 + counter), end='')
                counter += 1

            #print characters if it is the last row
            else:
                if i == rows - 1:
                    print(chr(65 + counter), end='')
                    counter += 1
                else:
                    print(' ', end='')
        print()

#rows to be spanned
n = 7

#call the function
hollow_pyramid(n)

Output

      A
     A B
    A   B
   A     B
  A       B
 A         B
ABCDEFGHIJKLM

Space Complexity: O(1)
Time Complexity: O(n^2)

Diamond Alphabet Pattern in Python

In this example, below Python code defines a function `print_diamond` to print either an upright or a reversed diamond pattern of uppercase letters, based on the `is_upright` parameter. It uses nested loops, with the first loop managing spaces before each line, and the second loop controlling the printing of characters. The code sets the number of rows to 7 and calls the function twice.

Python3

#define the function
def print_diamond(rows, is_upright=True):
    if is_upright:
        for i in range(rows):
            for j in range(rows - i - 1):
                print(' ', end='')
            for j in range(2 * i + 1):
                print(chr(65 + j), end='')
            print()
    else:
        for i in range(rows - 1):
            for j in range(i + 1):
                print(' ', end='')
            for j in range(2 * (rows - i - 1) - 1):
                print(chr(65 + j), end='')
            print()

#rows to be spanned
n = 7

#call the function to print upright triangle
print_diamond(n, is_upright=True)

#call the function to print reverse triangle
print_diamond(n, is_upright=False)

Output

      A
     ABC
    ABCDE
   ABCDEFG
  ABCDEFGHI
 ABCDEFGHIJK
ABCDEFGHIJKLM
 ABCDEFGHIJK
  ABCDEFGHI
   ABCDEFG
    ABCDE
     ABC
      A

Space Complexity: O(1)
Time Complexity: O(n^2)

Hourglass Alphabet Pattern in Python

In this example, below Python code defines a function `print_hourglass` to print an hourglass pattern of uppercase letters. It combines a reversed pyramid pattern and an upright pyramid pattern. The function uses nested loops to manage spaces and character printing for both the upper and lower halves of the hourglass.

Python3

#define function
def print_hourglass(rows):
    #print reverse pyramid
    for i in range(rows - 1):
        for j in range(i):
            print(' ', end='')
        for k in range(2 * (rows - i) - 1):
            print(chr(65 + k), end='')
        print()

    #print upright pyramid
    for i in range(rows):
        for j in range(rows - i - 1):
            print(' ', end='')
        for k in range(2 * i + 1):
            print(chr(65 + k), end='')
        print()

#rows to be spanned
n = 7

#call the function
print_hourglass(n)

Output

ABCDEFGHIJKLM
 ABCDEFGHIJK
  ABCDEFGHI
   ABCDEFG
    ABCDE
     ABC
      A
     ABC
    ABCDE
   ABCDEFG
  ABCDEFGHI
 ABCDEFGHIJK
ABCDEFGHIJKLM

Space Complexity: O(1)
Time Complexity: O(n^2)

Square Alphabet Pattern in Python

In this example , below Python code defines a function `print_square_pattern` to print a square pattern of uppercase letters. It uses nested loops, with the outer loop managing rows and the inner loop controlling the printing of characters.

Python3

#define the function
def print_square_pattern(rows):
    #print rows
    for i in range(rows):
        #print characters in each row
        for j in range(rows):
            print(chr(65 + i), end=" ")
        print()

#rows to be spanned
n = 7

#call the function
print_square_pattern(n)

Output

A A A A A A A 
B B B B B B B 
C C C C C C C 
D D D D D D D 
E E E E E E E 
F F F F F F F 
G G G G G G G 

Space Complexity: O(1)
Time Complexity: O(n^2)

Heart Alphabet Pattern in Python

In this example, below Python code defines a function `print_heart_pattern` to print a heart-shaped pattern of uppercase letters. It consists of an upper part and a lower part. The upper part prints characters and spaces in a specific pattern, and the lower part prints characters in a descending order. The code sets the size of the heart based on the rows .

Python3

#define the function
def print_heart_pattern(rows):
    #upper part of the heart
    for i in range(rows // 2, rows, 2):
        #prints spaces in the first half
        for j in range(1, rows - i, 2):
            print(" ", end="")
        #prints alphabets in the first half
        for j in range(i):
            print(chr(65 + j), end="")
        #prints spaces in the second half
        for j in range(1, rows - i + 1, 1):
            print(" ", end="")
        #print alphabets in the second half
        for j in range(i):
            print(chr(65 + j), end="")
        print()

    #lower part of the heart
    for i in range(rows, 0, -1):
        for j in range(i, rows):
            print(" ", end="")
        for j in range(i * 2):
            print(chr(65 + j), end="")
        print()

#size of the heart based on the rows in the lower part
n = 10

#call the function
print_heart_pattern(n)

Output

  ABCDE     ABCDE
 ABCDEFG   ABCDEFG
ABCDEFGHI ABCDEFGHI
ABCDEFGHIJKLMNOPQRST
 ABCDEFGHIJKLMNOPQR
  ABCDEFGHIJKLMNOP
   ABCDEFGHIJKLMN
    ABCDEFGHIJKL
     ABCDEFGHIJ
      ABCDEFGH
       ABCDEF
   ...

Space Complexity: O(1)
Time Complexity: O(n^2)

Right Pascal Alphabet Pattern in Python

In this example, Below Python function `right_pascal_triangle` generates a right-angled Pascal’s Triangle pattern using uppercase letters. It consists of ascending and descending parts, printing spaces and characters in a specific pattern. The code sets the row count to 7 and calls the function to produce the pattern.

Python3

#define the function
def right_pascal_triangle(rows):
    #prints ascending part
    for i in range(1, rows + 1):
        #prints spaces
        print(" " * (rows - i), end="")

        #prints alphabets
        for j in range(1, i + 1):
            print(chr(64 + j), end="")
        print()

    #prints descending part
    for i in range(rows - 1, 0, -1):
        #prints spaces
        print(" " * (rows - i), end="")

        #prints alphabets
        for j in range(1, i + 1):
            print(chr(64 + j), end="")
        print()

#rows to be spanned
n = 7

#call the function
right_pascal_triangle(n)

Output

      A
     AB
    ABC
   ABCD
  ABCDE
 ABCDEF
ABCDEFG
 ABCDEF
  ABCDE
   ABCD
    ABC
     AB
      A

Space Complexity: O(1)
Time Complexity: O(n^2)

Left Pascal Alphabet Pattern in Python

In this example, below Python code defines a function `left_pascal` to print a left-angled Pascal’s Triangle pattern using uppercase letters. It consists of an ascending part and a descending part, with each part printing characters in a specific pattern. The code sets the number of rows to 7 and calls the function to generate the left-angled Pascal’s Triangle pattern.

Python3

#define the function
def left_pascal(rows):
    #ascending part of the pattern
    for i in range(1, rows + 1):
        for j in range(1, i + 1):
            print(chr(64 + j), end="")
        print()

    #descending part of the pattern
    for i in range(rows - 1, 0, -1):
        for j in range(1, i + 1):
            print(chr(64 + j), end="")
        print()

#rows to be spanend
n = 7

#call the function
left_pascal(n)

Output

A
AB
ABC
ABCD
ABCDE
ABCDEF
ABCDEFG
ABCDEF
ABCDE
ABCD
ABC
AB
A

Space Complexity: O(1)
Time Complexity: O(n^2)

Conclusion

In conclusion, exploring alphabet pattern programs in Python has provided a comprehensive insight into the versatility and creative potential of the language. From simple triangular patterns to intricate shapes, these programs serve as a practical and engaging way to enhance one’s understanding of Python’s loop structures and string manipulation capabilities. The ability to customize patterns by adjusting rows, columns, and repetition adds an extra layer of complexity, allowing learners to sharpen their programming skills.