def __init__(self, key_start_date, key_end_date, pseudo_key):
self.copy = True<EOL>"""<STR_LIT>"""<EOL>self._pseudo_key = list(pseudo_key)<EOL>"""<STR_LIT>"""<EOL>self._key_end_date = key_end_date<EOL>"""<STR_LIT>"""<EOL>self._key_start_date = key_start_date<EOL>"""<STR_LIT>"""<EOL>self._rows = dict()<EOL>"""<STR_LIT>"""<EOL>self._date_type = '<STR_LIT>'<EOL>"""<STR_LIT>"""<EOL>
Object constructor.

:param str key_start_date: The key of the start date in the rows.
:param str key_end_date: The key of the end date in the rows.
:param list[str] pseudo_key: The keys of the columns that form the pseudo key.