Topic
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

Character Patterns Recursively

Print character patterns (A, AB, ABC...) recursively.

AdvancedPhase 3 - Level 3: Pattern RecursionExample 10 of 10
character-patterns-recursively.py
1def print_chars(n, current=0):
2    # Base case
3    if current >= n:
4        return
5    
6    # Print character
7    print(chr(65 + current), end="")  # 65 is 'A'
8    # Recurse
9    print_chars(n, current + 1)
10

11def print_pattern(n, row=1):
12    # Base case
13    if row > n:
14        return
15    
16    # Print row
17    print_chars(row)
18    print()
19    # Recurse
20    print_pattern(n, row + 1)
21

22# Test
23n = int(input("Enter rows: "))
24print_pattern(n)

Output

Enter rows: 4
A
AB
ABC
ABCD

What's going on

Use helper to print characters, main for rows.

Key Concepts:

Helper prints A to A+n-1
Main function prints rows
Recursive structure

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