⭐ Hollow Patterns in Python (With Code & Output)

[hirenpatel1903]

⭐ Hollow Patterns in Python (With Code & Output)

A curated collection of Python hollow pattern programs with clear explanations, clean code, and expected output.
This repository is ideal for beginners to intermediate learners who want to improve logic building and pattern programming skills.

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📌 Pattern List

1. Hollow Square Pattern (Stars)
2. Hollow Right Triangle Pattern (Stars)
3. Hollow Inverted Right Triangle Pattern (Stars)
4. Hollow Diamond Pattern (Stars)
5. Hollow Number Square Pattern
6. Hollow Butterfly Pattern (Stars)
7. Hollow Alphabet Box Pattern
8. Hollow Hourglass Pattern (Stars)

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1️⃣ Hollow Square Pattern (Stars)

This pattern prints a hollow square using * symbols.
Only the border elements are printed, while the inner area remains blank.

✅ Code:

n = 5
for i in range(n):
    for j in range(n):
        if i == 0 or i == n - 1 or j == 0 or j == n - 1:
            print("*", end=" ")
        else:
            print(" ", end=" ")
    print()

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

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2️⃣ Hollow Right Triangle Pattern (Stars)

This pattern prints a hollow right-angled triangle using * symbols.
Only the edges of the triangle are printed, while the inner area remains blank.

✅ Code:

n = 5
for i in range(1, n + 1):
    for j in range(1, i + 1):
        if i == n or j == 1 or j == i:
            print("*", end=" ")
        else:
            print(" ", end=" ")
    print()

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

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3️⃣ Hollow Inverted Right Triangle Pattern (Stars)

This pattern prints a hollow inverted right-angled triangle using * symbols.
Only the boundary elements are printed, while the inner area remains blank.

✅ Code:

n = 5
for i in range(n, 0, -1):
    for j in range(1, i + 1):
        if i == n or j == 1 or j == i:
            print("*", end=" ")
        else:
            print(" ", end=" ")
    print()

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

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4️⃣ Hollow Diamond Pattern (Stars)

This pattern prints a hollow diamond shape using * symbols.
Only the outline of the diamond is displayed, while the inner area remains blank.

✅ Code

n = 5

for i in range(1, n + 1):
    for j in range(n - i):
        print(" ", end="")
    for j in range(1, 2 * i):
        if j == 1 or j == 2 * i - 1:
            print("*", end="")
        else:
            print(" ", end="")
    print()

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

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

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5️⃣ Hollow Number Square Pattern

This pattern prints a hollow square using numbers.
Numbers appear only on the border, while the inner area remains empty.

✅ Code

n = 5

for i in range(1, n + 1):
    for j in range(1, n + 1):
        if i == 1 or i == n or j == 1 or j == n:
            print(j, end=" ")
        else:
            print(" ", end=" ")
    print()

1 2 3 4 5
1       5
1       5
1       5
1 2 3 4 5

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6️⃣ Hollow Butterfly Pattern (Stars)

This pattern prints a hollow butterfly shape using * symbols.
Only the outline of the butterfly wings is displayed, keeping the center hollow.

✅ Code

row = 5

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

for i in range(2, row + 1):
    for j in range(row - i):
        print(" ", end=" ")
    for j in range(1, 2 * i):
        if i == row or j == 1 or j == 2 * i - 1:
            print("*", end=" ")
        else:
            print(" ", end=" ")
    print()

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

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7️⃣ Hollow Alphabet Box Pattern

This pattern prints a hollow square using alphabets.
Characters appear only on the border, while the inner area remains empty.

✅ Code

n = 5
start = ord("A")

for i in range(n):
    for j in range(n):
        if i == 0 or i == n - 1 or j == 0 or j == n - 1:
            print(chr(start + j), end=" ")
        else:
            print(" ", end=" ")
    print()

A B C D E
A       E
A       E
A       E
A B C D E

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8️⃣ Hollow Hourglass Pattern (Stars)

This pattern prints a hollow hourglass shape using * symbols.
Only the outline of the hourglass is printed, while the inner area remains blank.

✅ Code

row = 5

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

for i in range(2, row + 1):
    for j in range(row - i):
        print(" ", end=" ")
    for j in range(1, 2 * i):
        if i == row or j == 1 or j == 2 * i - 1:
            print("*", end=" ")
        else:
            print(" ", end=" ")
    print()

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

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📝 How to Use This Repository

• Start with simple patterns and gradually move to complex ones.
• Understand the logic behind each loop and condition.
• Practice modifying the code to generate different sizes or symbols.
• Use this repository for interview preparation and logic-building exercises.
• Share it with beginners or include it in learning resources.

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