{{alias}}( str )
    Tests whether a string contains only white space characters.

    A white space character is defined as one of the 25 characters defined as a
    white space ("WSpace=Y","WS") character in the Unicode 9.0 character
    database, as well as one related white space character without the Unicode
    character property "WSpace=Y" (zero width non-breaking space which was
    deprecated as of Unicode 3.2).

    Parameters
    ----------
    str: string
        Input string.

    Returns
    -------
    bool: boolean
        Boolean indicating whether a string contains only white space
        characters.

    Examples
    --------
    > var bool = {{alias}}( '       ' )
    true
    > bool = {{alias}}( 'abcdef' )
    false
    > bool = {{alias}}( '' )
    false

    See Also
    --------