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get_history_candles

可在 __init__ 函數中取得過去 length 個週期為 period 的歷史資料，以便執行策略當下即可計算相關參數（例如 MA）。 呼叫後請儲存結果，CA.get_history_candles 僅可呼叫一次。

Input​

  length: number;
  period: number;
  is_reverse: boolean = False;

回傳​

  error: string;
  candles: dictionary;

範例​

獲取歷史價量資料（按時間順序排列）​

def __init__(self):
    self.period = 60 * 60 # 1 hour
    self.subscribed_books = {}
    self.options = {}
    # query the past 1 day data
    self.history_candles = CA.get_history_candles(24, self.period)
    if self.history_candles:
        CA.log(str(self.history_candles))
        for exchange in self.history_candles:
            for pair in self.history_candles[exchange]:
                for candle in self.history_candles[exchange][pair]:
                    CA.log(str(candle))

獲取歷史價量資料（按時間倒序排列）​

def __init__(self):
    self.period = 60 * 60 # 1 hour
    self.subscribed_books = {}
    self.options = {}
    # query the past 1 day data
    self.history_candles = CA.get_history_candles(24, self.period, True)
    if self.history_candles:
        CA.log(str(self.history_candles))
        for exchange in self.history_candles:
            for pair in self.history_candles[exchange]:
                for candle in self.history_candles[exchange][pair]:
                    CA.log(str(candle))