Updated modelchain.py

This handles the case where pressure or temp_air is not in weather, using the pvlib.tools._build_kwargs logic for keyword arguments. #523
pvlib · Ahanmr · Feb 17, 2020 · Feb 17, 2020 · Feb 17, 2020 · Feb 17, 2020
commit 6caa825042630c15f202c2eab2705b436ec243af
diff --git a/pvlib/modelchain.py b/pvlib/modelchain.py
@@ -16,6 +16,7 @@
 import pvlib.irradiance  # avoid name conflict with full import
 from pvlib.pvsystem import _DC_MODEL_PARAMS
 from pvlib._deprecation import pvlibDeprecationWarning
+from pvlib.tools import _build_kwargs
 
 
 def basic_chain(times, latitude, longitude,
@@ -859,10 +860,13 @@ def prepare_inputs(self, weather, times=None):
                           'is used for times.', pvlibDeprecationWarning)
 
         self.times = self.weather.index
+
+        kwargs = _build_kwargs(['pressure', 'temp_air'], weather)
+        kwargs['temperature'] = kwargs.pop('temp_air')
 
         self.solar_position = self.location.get_solarposition(
             self.weather.index, method=self.solar_position_method,
-            pressure=self.weather.pressure, temperature=self.weather.temp_air)
+            **kwargs)
 
        self.airmass = self.location.get_airmass(
             solar_position=self.solar_position, model=self.airmass_model)