apiToken (string.) – The API token to authenticate calls to Xignine APIs.
identifiers (list.) – A list with the fully qualified identifier for the securities including the exchange suffix.
frequency – The frequency of the bars.
Must be greater than or equal to bar.Frequency.MINUTE and less than bar.Frequency.DAY.
apiCallDelay (int.) – The delay in seconds between the bar’s close and the API call.
This is necessary because the bar may not be immediately available.
maxLen (int.) – The maximum number of values that the pyalgotrade.dataseries.bards.BarDataSeries will hold.
Once a bounded length is full, when new items are added, a corresponding number of items are discarded from the opposite end.