Indentation

301.7 Maintainable Code

Maintainable Code — Note 2 of 4

Format to show structure.

What you need to know

Python uses indentation to define code blocks (inside if, for, while, def). Consistent indentation (usually 4 spaces) is required — incorrect indentation causes errors.

What to know

Python requires indentation — it is not optional
Use 4 spaces per level (standard convention)
Code inside if/for/while/def must be indented
Inconsistent indentation causes IndentationError

Code examples

Proper indentation

python

if score >= 50:
    print("Pass")    # indented = inside if
    grade = "C"
else:
    print("Fail")    # indented = inside else
    grade = "U"

← Previous noteMeaningful names301.7 Maintainable Code Next note →Comments301.7 Maintainable Code

Back to Maintainable Code

Specification notes for programming are in Paper 2.