From 51df504a52757efdc106a37d1b0b426e2c571487 Mon Sep 17 00:00:00 2001
From: pilar <pilar_monsalvete@yahoo.es>
Date: Fri, 23 Oct 2020 06:57:34 -0400
Subject: [PATCH] modified building.py for saving monthly heating and cooling
 values

---
 city_model_structure/building.py | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/city_model_structure/building.py b/city_model_structure/building.py
index 68520dc4..dc75bb10 100644
--- a/city_model_structure/building.py
+++ b/city_model_structure/building.py
@@ -42,8 +42,8 @@ class Building(CityObject):
     self._type = 'building'
     self._monthly_heating = pd.DataFrame()
     self._monthly_cooling = pd.DataFrame()
-    self._hourly_heating = pd.DataFrame()
-    self._hourly_cooling = pd.DataFrame()
+    self._hourly_heating = []
+    self._hourly_cooling = []
     self._week_day_schedule = []
     self._saturday_schedule = []
     self._sunday_schedule = []
@@ -279,7 +279,7 @@ class Building(CityObject):
     self._building_units = value
 
   @property
-  def monthly_heating(self) -> pd.DataFrame:
+  def monthly_heating(self):
     """
     building monthly heating values in Watts-hour
     :return: DataFrame with 12 values and a header with the source of those
@@ -292,10 +292,13 @@ class Building(CityObject):
     building monthly heating values in Watts-hour and a header with the source
     :param value: DataFrame(heating demand)
     """
-    self._monthly_heating.append(value)
+    if self._monthly_heating.empty:
+      self._monthly_heating = value
+    else:
+      self._monthly_heating = pd.concat([self._monthly_heating, value])
 
   @property
-  def monthly_cooling(self) -> pd.DataFrame:
+  def monthly_cooling(self):
     """
     building monthly cooling values in Watts-hour
     :return: DataFrame with 12 values and a header with the source of those
@@ -308,10 +311,13 @@ class Building(CityObject):
     building monthly cooling values in Watts-hour and a header with the source
     :param value: DataFrame(cooling demand)
     """
-    self._monthly_cooling.append(value)
+    if self._monthly_cooling.empty:
+      self._monthly_cooling = value
+    else:
+      self._monthly_cooling = pd.concat([self._monthly_cooling, value])
 
   @property
-  def hourly_heating(self) -> pd.DataFrame:
+  def hourly_heating(self):
     """
     building hourly heating values in Watts-hour
     :return: DataFrame with 8760 values and a header with the source of those
@@ -327,7 +333,7 @@ class Building(CityObject):
     self._hourly_heating.append(value)
 
   @property
-  def hourly_cooling(self) -> pd.DataFrame:
+  def hourly_cooling(self):
     """
     building hourly cooling values in Watts-hour
     :return: DataFrame with 8760 values and a header with the source of those