Skip to content
RaamTrade Docs
Open RaamTrade

RC2_STATE_EMPTY_DICT

A bare {} literal has no value type to infer.

What it means

A class-body dict declared as name = {} carries no value-type information. RaamCode can’t tell whether the values are ints, decimals, bools, or strings — and the slot has to be typed before the first bar runs.

Why it happens

class Bad(Strategy):
    trade = Symbol()
    sizing = FixedCapital()


    empty = {}              # ❌ — what's the value type?


    def execute(self):
        if self.trade.is_flat:
            self.buy(self.trade)

How to fix it

Declare one entry to pin the value type, then fill or clear it in execute().

class Good(Strategy):
    trade = Symbol()
    sizing = FixedCapital()


    stops = {"_": 0.0}      # ✅ pins the value type as decimal


    def execute(self):
        if self.bar_count == 1:
            self.stops["entry"] = self.trade.close
        if self.trade.is_flat:
            self.buy(self.trade)

Or, when the keys are known up front, declare them with their initial values:

class Prefilled(Strategy):
    trade = Symbol()
    sizing = FixedCapital()


    counts = {"up": 0, "down": 0, "doji": 0}    # ✅ pre-populated


    def execute(self):
        if self.trade.close > self.trade.open:
            self.counts["up"] += 1
        if self.trade.is_flat:
            self.buy(self.trade)

Why we don’t allow bare {}

Same reason as RC2_STATE_EMPTY_LIST — the value type is pinned by the literal you declare, and an empty literal gives it nothing to bind to. The single-entry idiom is the smallest thing that removes the ambiguity.