text: #!/usr/bin/env python
  #  -*- coding: utf-8 -*-
  __author__ = 'chengzhi'
  
  from tqsdk import TqApi, TqSim
  import datetime
  
  api = TqApi(TqSim())
  # 获得cu1906 tick序列的引用
  ticks = api.get_tick_serial("SHFE.cu1906")
  # 获得cu1906 10秒K线的引用
  klines = api.get_kline_serial("SHFE.cu1906", 10)
  print(datetime.datetime.fromtimestamp(klines.iloc[-1]["datetime"]/1e9))
  
  while True:
      api.wait_update()
      # 判断整个tick序列是否有变化
      if api.is_changing(ticks):
          # ticks.iloc[-1]返回序列中最后一个tick
          print("tick变化", ticks.iloc[-1])
      # 判断最后一根K线的时间是否有变化，如果发生变化则表示新产生了一根K线
      if api.is_changing(klines.iloc[-1], "datetime"):
          # datetime: 自unix epoch(1970-01-01 00:00:00 GMT)以来的纳秒数
          print("新K线", datetime.datetime.fromtimestamp(klines.iloc[-1]["datetime"]/1e9))
      # 判断最后一根K线的收盘价是否有变化
      if api.is_changing(klines.iloc[-1], "close"):
          # klines.close返回收盘价序列
          print("K线变化", datetime.datetime.fromtimestamp(klines.iloc[-1]["datetime"]/1e9), klines.close.iloc[-1])
  