Add notes deprecating in_ipnb and in_qtconsole

Author: takluyver

pandas/core/common.py

@@ -2599,6 +2599,8 @@ def check_main():
 def in_qtconsole():
     """
     check if we're inside an IPython qtconsole
+    
+    DEPRECATED: This is no longer needed, or working, in IPython 3 and above.
     """
     try:
         ip = get_ipython()
@@ -2616,6 +2618,9 @@ def in_qtconsole():
 def in_ipnb():
     """
     check if we're inside an IPython Notebook
+    
+    DEPRECATED: This is no longer used in pandas, and won't work in IPython 3
+    and above.
     """
     try:
         ip = get_ipython()

pandas/core/frame.py

@@ -473,6 +473,9 @@ def _repr_html_(self):
         # qtconsole doesn't report it's line width, and also
         # behaves badly when outputting an HTML table
         # that doesn't fit the window, so disable it.
+        # XXX: In IPython 3.x and above, the Qt console will not attempt to
+        # display HTML, so this check can be removed when support for IPython 2.x
+        # is no longer needed.
         if com.in_qtconsole():
             # 'HTML output is disabled in QtConsole'
             return None