Invalid: Starting with a Digit Dry Run in PYTHON

Invalid: Starting with a Digit is an interactive PYTHON dry run visualizer from the Identifiers 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.

Invalid: Starting with a Digit Program Code

# Valid variable name:
number1 = 5
print("Valid:", number1)

# INVALID code (Causes SyntaxError if uncommented):
# 1number = 5
# print(1number)

View the complete Identifiers programs page.