<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _open_sheet(self, dtypes_dict=None):
 """Opens sheets and returns it"""

        table_name = self.db_sheet_table
        header_row = self.db_header_row
        nrows = self.nrows
        if dtypes_dict is None:
            dtypes_dict = self.dtypes_dict

        rows_to_skip = self.skiprows

        logging.debug(f"Trying to open the file {self.db_file}")
        logging.debug(f"Number of rows: {nrows}")
        logging.debug(f"Skipping the following rows: {rows_to_skip}")
        logging.debug(f"Declaring the following dtyps: {dtypes_dict}")
        work_book = pd.ExcelFile(self.db_file)
        try:
            sheet = work_book.parse(
                table_name, header=header_row, skiprows=rows_to_skip,
                dtype=dtypes_dict, nrows=nrows,
            )
        except ValueError as e:
            logging.debug("Could not parse all the columns (ValueError) "
                          "using given dtypes. Trying without dtypes.")
            logging.debug(str(e))
            sheet = work_book.parse(
                table_name, header=header_row, skiprows=rows_to_skip,
                nrows=nrows,
            )

        return sheet