fix Session lint issues

.gitignore

@@ -80,3 +80,4 @@ preprocessor.py
 .env
 .venv
 .idea
+.vscode

main.py

@@ -53,7 +53,7 @@ class TradeThread(threading.Thread):
                     msg = 'Got {} during _process()'.format(error.__class__.__name__)
                     logger.exception(msg)
                 finally:
-                    Session.flush()
+                    Session().flush()
                     time.sleep(25)
         except (RuntimeError, JSONDecodeError):
             TelegramHandler.send_msg('*Status:* Got RuntimeError: ```\n{}\n```'.format(traceback.format_exc()))
@@ -75,7 +75,7 @@ class TradeThread(threading.Thread):
                 # Create entity and execute trade
                 trade = create_trade(float(CONFIG['stake_amount']), api_wrapper.exchange)
                 if trade:
-                    Session.add(trade)
+                    Session().add(trade)
                 else:
                     logging.info('Got no buy signal...')
             except ValueError:
@@ -134,7 +134,7 @@ def close_trade_if_fulfilled(trade: Trade) -> bool:
     # we can close this trade.
     if trade.close_profit and trade.close_date and trade.close_rate and not trade.open_order_id:
         trade.is_open = False
-        Session.flush()
+        Session().flush()
         return True
     return False
 

persistence.py

@@ -2,7 +2,9 @@ from datetime import datetime
 
 from sqlalchemy import Boolean, Column, DateTime, Float, Integer, String, create_engine
 from sqlalchemy.ext.declarative import declarative_base
-from sqlalchemy.orm import scoped_session, sessionmaker
+from sqlalchemy.orm.scoping import scoped_session
+from sqlalchemy.orm.session import sessionmaker
+
 from sqlalchemy.types import Enum
 
 from exchange import Exchange, get_exchange_api
@@ -18,10 +20,8 @@ engine = create_engine(db_handle, echo=False)
 Session = scoped_session(sessionmaker(bind=engine, autoflush=True, autocommit=True))
 Base = declarative_base()
 
-
 class Trade(Base):
     __tablename__ = 'trades'
-
     query = Session.query_property()
 
     id = Column(Integer, primary_key=True)
@@ -61,7 +61,7 @@ class Trade(Base):
         self.close_profit = profit
         self.close_date = datetime.utcnow()
         self.open_order_id = order_id
-        Session.flush()
+        Session().flush()
         return profit
 
 Base.metadata.create_all(engine)