1.init

init函数只运行一次，用来填入标的
update_universe用来订阅股票

def init(context):
    #context.s1='000001.XSHE'
    context.stockcode = "000001.XSHE"
    context.stockcode2 = "000024.XSHE"
    update_universe([context.stockcode, context.stockcode2])