sachinpc
diff --git a/‎plotly/session.py
Copy file name to clipboardExpand all lines: plotly/session.py
+6-5Lines changed: 6 additions & 5 deletions b/‎plotly/session.py
Copy file name to clipboardExpand all lines: plotly/session.py
+6-5Lines changed: 6 additions & 5 deletions
@@ -43,6 +43,8 @@
     'sharing': six.string_types
 }
 
+SHARING_OPTIONS = ['public', 'private', 'secret']
+
 
 def sign_in(username, api_key, **kwargs):
     """
@@ -118,11 +120,10 @@ def update_session_plot_options(**kwargs):
                                          .format(key, PLOT_OPTIONS[key]))
 
         # raise exception if sharing is invalid
-        if (key == 'sharing' and not (kwargs[key] in
-                                      ['public', 'private', 'secret'])):
-            raise exceptions.PlotlyError("'{}' must be of either {}"
-                                         .format(key, "'public', 'private'" +
-                                                 " or 'secret'"))
+        if (key == 'sharing' and not (kwargs[key] in SHARING_OPTIONS)):
+            raise exceptions.PlotlyError("'{0}' must be of either '{1}', '{2}'"
+                                         " or '{3}'"
+                                         .format(key, *SHARING_OPTIONS))
 
     # update local _session dict with new plot options
     _session['plot_options'].update(kwargs)