I'm developing indicator in Indie v4, and I'm encountering the following error during the initialization of a state variable using indie.Var[int]: Error: [internal] cannot initialize variable self.trend_state of type <class 'indie.Var[int]'> with None that has type <class 'NoneType'>. This is my simplified code to understand the error: # indie:lang_version = 4 from indie import ( indicator, MainContext, algorithm, SeriesF, MutSeriesF, Var, param, plot, color, Plot ) from indie.algorithms import Sma, Ema @indicator("Trend Following System") class Main(MainContext): def __init__(self): """Initializing state tracking variables""" self.trend_state: Var[int] = None #!! Causes Error self.signal_counter: Var[int] = None #!! Causes Error def calc(self): """Trend calculation and state tracking""" if self.trend_state is None: self.trend_state = Var[int].new(0) if self.signal_counter is None: self.signal_counter = Var[int].new(0) prev_state = self.trend_state.get() # Test logic strength = self.close[0] - self.close[1] # Simplified for testing # Update trend state if strength > 0.5: self.trend_state.set(1) elif strength < -0.5: self.trend_state.set(-1) else: self.trend_state.set(0) if self.trend_state.get() != prev_state: self.signal_counter.set(self.signal_counter.get() + 1) return Plot(strength, color=color.GREEN if strength > 0 else color.RED) What I’ve Tried Declare self.trend_state in __init__() → Gives NoneType initialization error Move Var.new() to calc() → Is this best practice? Check self.trend_state.get() is only called after initialization Try Optional[Var[int]] but Indie doesn’t seem to support it Suspected Issues Should Var.new() only be called in calc() instead of __init__()? Does Indie require a different way to declare state-tracking variables in indicators? Is there a better way to initialize Var[int] in Indie without hitting type errors? Are there any guidelines for stateful variables in Indie indicators? Continue reading...
