def __init__(self, field):
self._field = field<EOL>"""<STR_LIT>"""<EOL>self._values = list()<EOL>"""<STR_LIT>"""<EOL>self._conditions = list()<EOL>"""<STR_LIT>"""<EOL>
Object contructor.

:param str field: The name of the field in the row that must be match against the expression.