add index function
add index function
msincenselee/vnpy,rrrrrr8/vnpy,andrewchenshx/vnpy,harveywwu/vnpy,bigdig/vnpy,andrewchenshx/vnpy,harveywwu/vnpy,rrrrrr8/vnpy,andrewchenshx/vnpy,harveywwu/vnpy,rrrrrr8/vnpy,wisfern/vnpy,bigdig/vnpy,harveywwu/vnpy,harveywwu/vnpy,msincenselee/vnpy,rrrrrr8/vnpy,bigdig/vnpy,wisfern/vnpy,andrewchenshx/vnpy,msincenselee/vnpy,vnpy/vnpy,wisfern/vnpy,wisfern/vnpy,msincenselee/vnpy,wisfern/vnpy,wisfern/vnpy,vnpy/vnpy,andrewchenshx/vnpy,rrrrrr8/vnpy,harveywwu/vnpy,rrrrrr8/vnpy,bigdig/vnpy