Editing Off-side rule (section)

== Example ==

The following is an example of indentation blocks in [[Python (programming language)|Python]]; a popular off-side rule language. 
In Python, the rule is taken to define the boundaries of statements rather than declarations.

<syntaxhighlight lang="python" line>
def is_even(a: int) -> bool:
    if a % 2 == 0:
        print('Even!')
        return True
    print('Odd!')
    return False
</syntaxhighlight>

The body of the function starts on line 2 since it is indented one level (4 spaces) more than the previous line. The <code>if</code> clause body starts on line 3 since it is indented an additional level, and ends on line 4 since line 5 is indented a level less, a.k.a. outdented.

The colon (<code>:</code>) at the end of a control statement line is Python syntax; not an aspect of the off-side rule. The rule can be realized without such colon syntax.