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python

IndentationError: expected an indented block

A statement that opens a block (like if, def, for, or class) is followed by a line at the same indentation level instead of an indented body. Python requires at least one indented statement inside every block.

Common causes

A function, class, or if block has no body — you started the block but wrote nothing inside it
The body was accidentally de-indented to the same level as the block header
You used a comment (#) as the only content of a block — comments don't count as statements
You wrote the block header but forgot to write the body before moving on

How to fix it

Add an indented statement inside the block — even pass works as a placeholder: def my_func(): pass
Use pass as a stub body while developing: if condition:\n pass
Check indentation — the body must be indented one level deeper than the header
If you meant to skip the body temporarily, use pass (not a comment)

Example

  File "app.py", line 4
    def greet():
    print('hi')
    ^
IndentationError: expected an indented block after function definition on line 3

A function definition whose body is at the same indentation as the def line

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