Got "IndexError: array index out of range" with current data

[Yacc Don]

To access datetime in indicator next function, I pass self.datas[0].datetime as extra data:

class UserStockStrategy(bt.Strategy):
    def __init__(self):
          self.indicator = my_indicator(self.datas[0], self.datas[0].datetime)

class my_indicator(bt.Indicator):
    def next(self):
          print(self.datas[0][0])  #This is ok
          print( bt.num2date(self.datas[1][0] )  # This line give error at the final, while self.datas[0][0] is avaliable.

I didn't access the futher data, why did I get IndexError.

Could anybody help me, Thanks in advance

@backtrader @ab_trader

[ab_trader]

@yacc-don said in Got "IndexError: array index out of range" with current data:

To access datetime in indicator next function, I pass self.datas[0].datetime as extra data

no, you don't do this. you initiated indicator class with additional argument, but within indicator class this argument is not specified. calling

self.datas[1]

you just refer to 2nd data feed in the bt environment, which (my guess) doesn't exist.

iirc data feeds are passed to the indicators as default, so this

class UserStockStrategy(bt.Strategy):
    def __init__(self):
          self.indicator = my_indicator()

class my_indicator(bt.Indicator):
    def next(self):
          print(self.datas[0][0])
          print(self.datas[0].datetime)

should give you what you want. maybe you need to massage second print statement a little bit, it was long time ago when i used it.

[Yacc Don]

@ab_trader Your solution is very good, thank you.