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TA-Lib BBands Indicator in Backtrader Strategy Faild #430
Description
Hello
I am a new python user and got annoying error "" TypeError: Invalid parameter value for nbdevup (expected float, got int) "" When I use bt.talib.bband in my strategy class at backtrader .
What Should I do? Would you please help me. Here is my Initiation of strategy which error get occurred
`import backtrader as bt
import talib
class TestStrategy(bt.Strategy):
def __init__(self): ## initialize function
self.bb = bt.talib.BBANDS(self.data.close, timeperiod = 14)
# or even : a,b,c = bt.talib.BBANDS()
# or even : a,b,c = bt.talib.BBANDS(self or self.data)
`
Activity
mrjbq7 commentedon Jun 5, 2021
What is
bt?The error is that you need to pass a
floatinstead of aninttonbdevup.mario4tier commentedon Oct 24, 2026
Fixed in #780: an abstract function now takes an int (or a numpy number) for a real parameter, as
talib.funcdoes, soBBANDS(..., nbdevup=2)works.Accept any number of a parameter's kind in the abstract API
Accept any number of a parameter's kind in the abstract API