extra_blank_lines.patch

diff --git a/src/sage/repl/interpreter.py b/src/sage/repl/interpreter.py
index 6c6dfd7..e7cc68c 100644
--- a/src/sage/repl/interpreter.py
+++ b/src/sage/repl/interpreter.py
@@ -102,12 +102,17 @@ Check that Cython source code appears in tracebacks::
 #*****************************************************************************
 
 
+from __future__ import print_function
 import os
 import re
+import sys
+
+from IPython.core.displayhook import DisplayHook
+
 from sage.repl.preparse import preparse
 from sage.repl.prompts import SagePrompts, InterfacePrompts
 
-from traitlets import Bool, Type
+from traitlets import Bool, Type, default
 
 from sage.env import SAGE_LOCAL
 from sage.repl.configuration import sage_ipython_config, SAGE_EXTENSION
@@ -234,6 +239,21 @@ class SageNotebookInteractiveShell(SageShellOverride, InteractiveShell):
         backend.get_display_manager().switch_backend(backend, shell=self)
 
 
+class SageRichPromptDisplayHook(DisplayHook):
+    """Subclass of base display hook using coloured prompt"""
+
+    prompt_end_newline = True
+
+    def write_output_prompt(self):
+        sys.stdout.write(self.shell.separate_out)
+        if self.do_full_cache:
+            tokens = self.shell.prompts.out_prompt_tokens()
+            if self.shell.pt_cli:
+                self.shell.pt_cli.print_tokens(tokens)
+            else:
+                print(*(s for t, s in tokens), sep='')
+
+
 class SageTerminalInteractiveShell(SageShellOverride, TerminalInteractiveShell):
     """
     IPython Shell for the Sage IPython Commandline Interface
@@ -261,6 +281,10 @@ class SageTerminalInteractiveShell(SageShellOverride, TerminalInteractiveShell):
         backend = BackendIPythonCommandline()
         backend.get_display_manager().switch_backend(backend, shell=self)
 
+    @default('displayhook_class')
+    def _displayhook_class_default(self):
+        return SageRichPromptDisplayHook
+
 
 class SageTestShell(SageShellOverride, TerminalInteractiveShell):
     """