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Basics of Python

Learning Objectives

• Understand interpreter-based execution.
• Write correctly indented Python programs.
• Trace top-to-bottom flow with conditions.

Concept

Python executes statements sequentially and uses indentation to define code blocks.

Example

print("Start")
num = 5
if num > 0:
    print("Positive")
print("End")

Dry Run

• Prints Start
• num > 0 is true -> prints Positive
• Prints End

Common Mistakes

• Mixed tabs/spaces.
• Missing indentation after if, for, while, def.

Practice

1. Write a script that prints even/odd for one input.
2. Add nested condition with proper indentation.