avoid mutation of input data (irradiance)

Uwe Krien · Uwe Krien · commit 6a1a61dfd2bb · 2016-10-17T11:34:51.000+02:00
diff --git a/pvlib/modelchain.py b/pvlib/modelchain.py
@@ -702,7 +702,7 @@ def prepare_inputs(self, times=None, irradiance=None, weather=None):
         if irradiance is not None:
             warnings.warn(wrn_txt, FutureWarning)
             for column in irradiance.columns:
-                self.weather[column] = irradiance.pop(column)
+                self.weather[column] = irradiance[column]
         # **** End ****
 
         if times is not None:
