def join ( mapping , bind , values ) : return [ ' ' . join ( [ six . text_type ( v ) for v in values if v is not None ] ) ]
join list of empty strings and strings python
Merge all the strings . Put space between them .
def join(mapping, bind, values):
    """ Merge all the strings. Put space between them. """
    return [' '.join([six.text_type(v) for v in values if v is not None])]