def subtract(a, b):
    """Subtracts two numbers.

    Function to subtract two numbers.

    Parameters
    ----------
    a : numbers.Real

        First operand.

    b : numbers.Real

        Second operand.

    Returns
    -------
    numbers.Real

        Difference of a and b.

    Examples
    --------

    >>> import blaupause
    >>> blaupause.subtract(3, 2)
    1

    """
    return a - b