The __init__.py File Magic File Dry Run in PYTHON

The __init__.py File Magic File is an interactive PYTHON dry run visualizer from the Packages 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.

The __init__.py File Magic File Program Code

# File 1: mypackage/__init__.py
# This code runs when the package is imported

print("Loading mypackage...")

# Make specific functions available at package level
from .math_ops import add, multiply
from .string_ops import reverse

# Define what gets imported with "from package import *"
__all__ = ["add", "multiply", "reverse"]

# File 2: main.py
# Now you can import functions directly!
from mypackage import add, reverse, multiply

print(add(100, 200))
print(multiply(6, 7))
print(reverse("Package"))

# You can still import modules if needed
from mypackage import math_ops
print(math_ops.multiply(3, 3))

View the complete Packages programs page.