BUG: fix for com.in_interactive_session #2585

Author: Chang She

pandas/core/common.py

@@ -1219,17 +1219,16 @@ def in_interactive_session():
 
     returns True if running under python/ipython interactive shell
     """
-    try:
-        ipy = __IPYTHON__
-        if ipy:
-            return True
-    except:
-        pass
-    finally:
+    def check_main():
         import __main__ as main
         return (not hasattr(main, '__file__') or
                 get_option('mode.sim_interactive'))
 
+    try:
+        return __IPYTHON__ or check_main()
+    except:
+        return check_main()
+
 def in_qtconsole():
     """
     check if we're inside an IPython qtconsole