🐍 Python Pattern Challenge — Day 25

Pattern printing is a fun way to improve your Python loops, number sequences, and logical thinking. For Day 25, let's create a beautiful Number Pyramid Pattern 🔺.

This pattern starts with 1 at the top and expands row by row. Each row increases up to a middle number and then decreases symmetrically, creating a pyramid-like design.

🎯 Today's Challenge

Write a Python program to print the following pattern:

Best and cleanest code will be rewarded! 🏆

Solution 1 — Using Nested for Loops

n = 5

for i in range(1, n + 1):
    print("  " * (n - i), end="")

    for j in range(1, i + 1):
        print(j, end=" ")

    for j in range(i - 1, 0, -1):
        print(j, end=" ")

    print()

How It Works

1. Controlling the rows

for i in range(1, n + 1):

This loop creates five rows, increasing the value of i from 1 to 5.

2. Adding spaces

print(" " * (n - i), end="")

Spaces move each row toward the center, forming the pyramid shape.

3. Printing increasing numbers

for j in range(1, i + 1): 

    print(j, end=" ")

This loop prints numbers from 1 up to the current row number.

4. Printing decreasing numbers

for j in range(i - 1, 0, -1): 

    print(j, end=" ")

This loop prints the numbers in reverse order, without repeating the middle number.

For example, when i = 4, the row becomes:

1 2 3 4 3 2 1

Solution 2 — Using a Simple List

for i in range(1, 6):
    row = list(range(1, i + 1))
    row += list(range(i - 1, 0, -1))
    print("  " * (5 - i) + " ".join(map(str, row)))

Here, range() creates the increasing and decreasing sequences, while map(str, row) converts the numbers into strings for joining.

Solution 3 — Using a Function

def number_pyramid(n):
    for i in range(1, n + 1):
        left = list(range(1, i + 1))
        right = list(range(i - 1, 0, -1))
        row = left + right

        print("  " * (n - i) + " ".join(map(str, row)))

number_pyramid(5)

You can change number_pyramid(5) to number_pyramid(7) to create a larger pyramid.

⚡ Short & Clean Code

for i in range(1, 6):
    print("  " * (5-i), *range(1, i+1),
          *range(i-1, 0, -1))

This compact version generates the same number pyramid using Python's unpacking operator.

🚀 Challenge Yourself

Can you modify this pattern?

• Increase the pyramid to 10 rows.

• Create the same pattern using a while loop.

• Replace numbers with alphabets.

• Print the pyramid upside down.

• Create a similar pattern using * symbols.

Drop your solution below! 👇

25 Days. 25 Patterns. Stronger Python Logic. 🐍🔥

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