Delete unnecessary parentheses

Birgit Schachler · Birgit Schachler · commit 381e33878c5e · 2017-05-17T15:10:30.000+02:00
diff --git a/windpowerlib/wind_turbine.py b/windpowerlib/wind_turbine.py
@@ -99,7 +99,7 @@ def __init__(self, turbine_name, hub_height, d_rotor, cp_values=None,
 
         self.power_output = None
 
-        if (self.cp_values is None and self.p_values is None):
+        if self.cp_values is None and self.p_values is None:
             self.fetch_turbine_data()
 
     def fetch_turbine_data(self):
