crawl stocks price from Yahoo Finance
the csv includes shares eligible for short selling, in general it means shares that are more liquid. A full list of security can be found here: https://www.hkex.com.hk/eng/services/trading/securities/securitieslists/ListOfSecurities.xlsx
However because the security code in the short sell list is different from that of the fill list, you would have to change the function crawler to adapt the stock code for the yahoo finance API.