原来是免费版不能下载数据
zn2201 , SHFE 1970-01-01 08:00:00 7435.0 zn2201 , SHFE 1970-01-01 08:00:00 5575.0 zn2201 , SHFE 1970-01-01 08:00:00 4625.0 zn2201 , SHFE 1970-01-01 08:00:00 4495.0 zn2201 , SHFE 1970-01-01 08:00:00 4645.0...
