Scripts, print, and Indentation

Scenario: Your useful experiment must run again tomorrow.

New words, in plain English

• Script - a saved text file of instructions
• .py file - the usual filename ending for Python source
• Indentation - spaces at the start of a line that group code

Save code as hello.py, then run python3 hello.py. print() displays values. Python uses consistent indentation as grammar, usually four spaces inside a block.

Analogy: A Python program is like a clear set of instructions for a careful helper: names label things, indentation groups steps, and errors explain where the helper became confused.

A small, real example

name = "Maya"
if name:
    print(f"Hello, {name}!")

Tip: Do not mix tabs and spaces. A formatter can keep indentation consistent.

Goal: Practice this idea in the py-variables-types challenge at /labs/python. Fix the broken program, run it yourself, then use check to prove the real end state.