diff --git a/RealSpaceInterface/Calc2D/CalculationClass.py b/RealSpaceInterface/Calc2D/CalculationClass.py
index 0a6b5bb40..c63af4204 100644
--- a/RealSpaceInterface/Calc2D/CalculationClass.py
+++ b/RealSpaceInterface/Calc2D/CalculationClass.py
@@ -71,7 +71,7 @@ def getData(self, redshiftindex):
         Valuenew = dict()
         FValue_abs = np.abs(self.FValue)
         _min, _max = FValue_abs.min(), FValue_abs.max()
-        dimensions = (self.endshape[0] / 2, self.endshape[1])
+        dimensions = (self.endshape[0] // 2, self.endshape[1])
         for quantity, FT in FValuenew.items():
             FT_abs = np.abs(FT)
             FT_normalized = cv2.resize(FT_abs, dimensions).ravel()
@@ -98,7 +98,7 @@ def getInitialData(self):
         return Value.ravel(), cv2.resize(
             (np.abs(self.FValue) - np.abs(self.FValue).min()) /
             (np.abs(self.FValue).max() - np.abs(self.FValue).min()),
-            (self.endshape[0] / 2, self.endshape[1])).ravel(), (minimum,
+            (self.endshape[0] // 2, self.endshape[1])).ravel(), (minimum,
                                                                 maximum)
 
     def getTransferData(self, redshiftindex):
diff --git a/RealSpaceInterface/Calc2D/Database.py b/RealSpaceInterface/Calc2D/Database.py
index bc8f006c2..68b1bab4b 100644
--- a/RealSpaceInterface/Calc2D/Database.py
+++ b/RealSpaceInterface/Calc2D/Database.py
@@ -14,22 +14,22 @@ def __init__(self, directory, db_file="database.dat"):
         self.db_path = os.path.join(directory, db_file)
         if not os.path.exists(self.db_path):
             logging.info("No database found; Creating one at {}.".format(self.db_path))
-            with open(self.db_path, "w") as f:
+            with open(self.db_path, "wb") as f:
                 pickle.dump(dict(), f)
 
         self.db = self.__read_database()
 
     def __read_database(self):
-        with open(self.db_path) as f:
+        with open(self.db_path, "rb") as f:
             return pickle.load(f)
 
     def __write_database(self):
-        with open(self.db_path, "w") as f:
+        with open(self.db_path, "wb") as f:
             pickle.dump(self.db, f)
 
     def __create_file(self, data):
         filename = str(uuid.uuid4())
-        with open(os.path.join(self.directory, filename), "w") as f:
+        with open(os.path.join(self.directory, filename), "wb") as f:
             pickle.dump(data, f)
         return filename
 
@@ -40,7 +40,7 @@ def __getitem__(self, key):
         frozen_key = self.__get_frozen_key(key)
         if frozen_key in self.db:
             filename = self.db[frozen_key]
-            with open(os.path.join(self.directory, filename)) as f:
+            with open(os.path.join(self.directory, filename), "rb") as f:
                 return pickle.load(f)
         else:
             raise KeyError("No data for key: {}".format(key))
@@ -55,4 +55,4 @@ def __contains__(self, key):
         Return whether `self` contains a record
         for the given `key`.
         """
-        return self.__get_frozen_key(key) in self.db
\ No newline at end of file
+        return self.__get_frozen_key(key) in self.db