diff --git a/bancor_research/bancor_simulator/v3/spec/network.py b/bancor_research/bancor_simulator/v3/spec/network.py
index ecc297b..740dff6 100644
--- a/bancor_research/bancor_simulator/v3/spec/network.py
+++ b/bancor_research/bancor_simulator/v3/spec/network.py
@@ -218,7 +218,6 @@ def deposit(
         )
         self.next_transaction(state)
 
-
     def trade(
         self,
         tkn_amt: str,
@@ -252,7 +251,6 @@ def trade(
         )
         self.next_transaction(state)
 
-
     def begin_cooldown_by_rtkn(
         self,
         tkn_amt: str,
@@ -327,7 +325,6 @@ def withdraw(
         )
         self.next_transaction(state)
 
-
     def enable_trading(
         self,
         tkn_name: str,
@@ -356,7 +353,6 @@ def enable_trading(
         )
         self.next_transaction(state)
 
-
     def describe(self, decimals: int = -1):
         """
         Describes the state ledger in a format similar to BIP15 documentation.
@@ -435,7 +431,7 @@ def whitelist_token(self, tkn_name: str, timestamp: int = 0):
         """
         state = self.get_state(copy_type="initial", timestamp=timestamp)
         tkn_name = tkn_name.lower()
-        state.price_feeds[tkn_name]=state.price_feeds['bnt'].values
+        state.price_feeds[tkn_name] = state.price_feeds["bnt"].values
 
         state.create_whitelisted_tkn(tkn_name)
         handle_whitelisting_tokens(state)