'''backtest
start: 2020-02-27 00:00:00
end: 2020-02-27 00:00:00
period: 1d
exchanges: [{"eid":"Futures_OKCoin","currency":"ETH_USD","stocks":1.6}]
'''
#常规上下网格
import json
global_param={
              'sell_id':0,
              'buy_id':0,
              'buy_amount':0,#当前多单数量