I want to know how to download an index sectors' historical weightings from Bloomberg. For example, S&P 500 is comprised of Telecom Svc, Materials, Utilities, Energy, Consumer Staples, Industrials, Consumer Discretionary, Financials, Health Care, and Information Tech. I have used 'member go' in the terminal and know how to do it using excel. How can i pull out the weight using python Bloomberg Api. I am using python3 and modified a bit of RefDataTableOverrideExample and it just give me current day data, was looking for get historical data. anyone knows how to do this?