Built-in function help displays the docstring from a function definition. For example, consider this function:

def area(base, height):
    """(number, number) -> number

    Return the area of a triangle with dimensions base
    and height.
    """

    return base * height / 2

Calling help on function area produces this output:

>>> help(area)
Help on function area in module __main__:

area(base, height)
    (number, number) -> number
    
    Return the area of a triangle with dimensions base
    and height.