raising exceptions if keys are not defined

bfxbot/bfxbot.py

@@ -8,6 +8,14 @@ from bfxbot.models import SymbolStatus, Ticker, EventHandler, Strategy
 
 class BfxBot:
     def __init__(self, api_key: str, api_secret: str, tick_duration: int = 1):
+        if api_key is None:
+            print("API_KEY is not set!")
+            raise ValueError
+
+        if api_secret is None:
+            print("API_SECRET is not set!")
+            raise ValueError
+
         self.bfx: BfxWrapper = BfxWrapper(api_key, api_secret)
         self.status: Dict[Symbol, SymbolStatus] = {}
         self.ticker: Ticker = Ticker(tick_duration)