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1. Print Line of N Stars Recursively2. Print Square of Stars Recursively3. Print Triangle (Top-Down) Recursively4. Print Triangle (Bottom-Up) Recursively5. Number Patterns Recursively6. Print Reverse Triangle Recursively7. Multiplication Table Recursively8. Increasing + Decreasing in One Function9. Sum Series with Steps Recursively10. Character Patterns Recursively

Print Reverse Triangle Recursively

Print reverse triangle pattern recursively.

IntermediatePhase 3 - Level 3: Pattern RecursionExample 6 of 10
print-reverse-triangle-recursively.py
1def print_stars(n):
2    if n == 0:
3        return
4    print("*", end="")
5    print_stars(n - 1)
6

7def print_reverse_triangle(n, row=1):
8    # Base case
9    if row > n:
10        return
11    
12    # Recurse first
13    print_reverse_triangle(n, row + 1)
14    # Print spaces
15    print(" " * (n - row), end="")
16    # Print stars
17    print_stars(row)
18    print()
19

20# Test
21n = int(input("Enter rows: "))
22print_reverse_triangle(n)

Output

Enter rows: 5
    *
   **
  ***
 ****
*****

What's going on

Recurse first, then print with spaces.

Key Concepts:

Recurse before printing
Add spaces for alignment
Creates right-aligned triangle

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