Recursive Fibonacci triangle Dry Run in PYTHON

Recursive Fibonacci triangle is an interactive PYTHON dry run visualizer from the Patterns programs section. Study the source code, then use the execution controls to follow each step, variable update, highlighted line, and console output.

This page provides a browser-based dry run with source-code highlighting, auto-scroll, voice narration controls, and execution output for learning the program step by step.

Recursive Fibonacci triangle Program Code

def fib(n):
    if n <= 1: return n
    return fib(n - 1) + fib(n - 2)
def print_fib(n, idx=0, row=1):
    if row > n: return
    row_vals = [str(fib(j)) for j in range(idx, idx + row)]
    print(" ".join(row_vals))
    print_fib(n, idx + row, row + 1)
print_fib(4)

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