Python IndentationError: Expected an Indented Block After Function Definition

This error occurs when a function definition in Python lacks an indented block following it. In Python, indentation is crucial for defining the scope of code blocks like functions or loops. Without proper indentation, Python struggles to determine where a function block ends and other code begins.

To rectify this error, simply add an indented code block after the function definition. For instance:

def my_function():
    print('Hello, world!')

In this example, the indented block following the function definition contains the code to be executed when the function is called. If there's no code to execute, you can use the 'pass' keyword to indicate an empty block:

def my_function():
    pass