refactor: use a function to remove the fraction

packages/valory/skills/decision_maker_abci/behaviours/base.py

@@ -58,6 +58,14 @@
 SAFE_GAS = 0
 
 
+def remove_fraction_wei(amount: int, fraction: float) -> int:
+    """Removes the given fraction from the given integer amount and returns the value as an integer."""
+    if 0 <= fraction <= 1:
+        keep_percentage = 1 - fraction
+        return int(amount * keep_percentage)
+    raise ValueError(f"The given fraction {fraction!r} is not in the range [0, 1].")
+
+
 class DecisionMakerBaseBehaviour(BaseBehaviour, ABC):
     """Represents the base class for the decision-making FSM behaviour."""
 

packages/valory/skills/decision_maker_abci/behaviours/decision_receive.py

@@ -28,6 +28,7 @@
 from packages.valory.skills.decision_maker_abci.behaviours.base import (
     DecisionMakerBaseBehaviour,
     WaitableConditionType,
+    remove_fraction_wei,
 )
 from packages.valory.skills.decision_maker_abci.models import (
     MechInteractionResponse,
@@ -273,7 +274,7 @@ def _is_profitable(self, confidence: float, vote: int) -> bool:
         """Whether the decision is profitable or not."""
         bet = self.synchronized_data.sampled_bet
         bet_amount = self.params.get_bet_amount(confidence)
-        net_bet_amount = int(bet_amount * (1 - self.wei_to_native(bet.fee)))
+        net_bet_amount = remove_fraction_wei(bet_amount, self.wei_to_native(bet.fee))
         num_shares, available_shares = self._calc_binary_shares(net_bet_amount, vote)
         mech_price = self.synchronized_data.mech_price
         bet_threshold = self.params.bet_threshold