Recursive number triangle Dry Run in PYTHON

Recursive number 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 number triangle Program Code

def num_tri(n, i=1):
    if i > n: return
    print(" ".join(str(j) for j in range(1, i + 1)))
    num_tri(n, i + 1)
num_tri(4)

View the complete Patterns programs page.