Force ints to floats so they can be json serialized

metobsapi/data_api.py

@@ -160,6 +160,10 @@ def handle_csv(frame, epoch, sep=',',
 @as_json_p(optional=True)
 def handle_json(frame, epoch, order='columns',
                 message='', code=200, status='success', **kwargs):
+    # force conversion to float types so they can be json'd
+    for column, data_type in zip(frame.columns, frame.dtypes.values):
+        if issubclass(data_type.type, np.integer):
+            frame[column] = frame[column].astype(float)
     # replace NaNs with None
     frame = frame.where(pd.notnull(frame), None)
     output = {}