Nov 5 (Reuters) - Canada’s main stock index scaled another record high at open on Friday, aided by strength in energy stocks and a slew of upbeat corporate earnings, putting the benchmark index on course for a weekly gain. At 9:31 a.m. ET (1331 GMT), the Toronto Stock Exchange’s S&P/TSX composite index was up 36.31 points, or 0.17%, at 21,378.44. Reporting by Amal S in Bengaluru; Editing by Maju Samuel