fix some lint issues

Author: zingale

examples/testing/pytest/fixtures/shopping_cart.py

@@ -50,5 +50,4 @@ def __add__(self, other):
         """add two items together if they are the same type"""
         if self.name == other.name:
             return Item(self.name, self.quantity + other.quantity)
-        else:
-            raise ValueError("names don't match")
+        raise ValueError("names don't match")