fixed some mypy bugs

src/graph.py

@@ -5,16 +5,12 @@
 
 
 class PricePath:
-    def __init__(self, exchanges: list = None, gdict: dict = None, cache: dict = None):
-        if not gdict:
-            gdict = {}
-        if not cache:
-            cache = {}
+    def __init__(self, exchanges: list = [], gdict: dict = {}, cache: dict = {}):
         if not exchanges:
             exchanges = ["binance", "coinbasepro"]
         self.gdict = gdict
         self.cache = cache
-        self.priority = {}
+        self.priority : dict= {}
         allpairs = []
 
         for exchange_id in exchanges:
@@ -249,7 +245,6 @@ def get_active_timeframe(path, starttimestamp=0, stoptimestamp=-1):
 
 if __name__ == "__main__":
     g = PricePath()
-    allpairs = []
     start = "IOTA"
     to = "EUR"
     preferredexchange = "binance"

src/price_data.py

@@ -47,9 +47,6 @@ class PriceData:
     def __init__(self):
         self.path = PricePath()
 
-    def __init__(self):
-        self.path = PricePath()
-
     def get_db_path(self, platform: str) -> Path:
         return Path(config.DATA_PATH, f"{platform}.db")
 
@@ -426,13 +423,13 @@ def get_cost(
 
     def get_candles(self, start: int, stop: int, symbol: str, exchange: str) -> list:
         exchange_class = getattr(ccxt, exchange)
-        exchange = exchange_class()
-        if exchange.has["fetchOHLCV"]:
-            sleep(exchange.rateLimit / 1000)  # time.sleep wants seconds
+        exchange_obj = exchange_class()
+        if exchange_obj.has["fetchOHLCV"]:
+            sleep(exchange_obj.rateLimit / 1000)  # time.sleep wants seconds
             # get 2min before and after range
             startval = start - 1000 * 60 * 2
             rang = max(int((stop - start) / 1000 / 60) + 2, 1)
-            return exchange.fetch_ohlcv(symbol, "1m", startval, rang)
+            return list(exchange_obj.fetch_ohlcv(symbol, "1m", startval, rang))
         else:
             log.error(
                 "fetchOHLCV not implemented on exchange, skipping priceloading using ohlcv"