diff --git a/IPython/core/tests/test_completer.py b/IPython/core/tests/test_completer.py
index 3fb77a3..39f690a 100644
--- a/IPython/core/tests/test_completer.py
+++ b/IPython/core/tests/test_completer.py
@@ -126,6 +126,27 @@ def test_unicode_completions():
         nt.assert_true(isinstance(text, string_types))
         nt.assert_true(isinstance(matches, list))
 
+@dec.onlyif(sys.version_info[0] >= 3, 'This test only applies in Py>=3')
+def test_latex_completions():
+    from IPython.core.latex_symbols import latex_symbols
+    import random
+    ip = get_ipython()
+    # Test some random unicode symbols
+    keys = random.sample(latex_symbols.keys(), 10)
+    for k in keys:
+        text, matches = ip.complete(k)
+        nt.assert_equal(len(matches),1)
+        nt.assert_equal(text, k)
+        mt.assert_equal(matches[0], latex_symbols[k])
+    # Test a more complex line
+    text, matches = ip.complete(u'print(\\alpha')
+    nt.assert_equals(text, u'\\alpha')
+    nt.assert_equals(matches[0], latex_symbols['\\alpha'])
+    # Test multiple matching latex symbols
+    text, matches = ip.complete(u'\\al')
+    nt.assert_in('\\alpha', matches)
+    nt.assert_in('\\aleph', matches)
+
 
 class CompletionSplitterTestCase(unittest.TestCase):
     def setUp(self):
diff --git a/IPython/html/static/notebook/js/codemirror-ipython.js b/IPython/html/static/notebook/js/codemirror-ipython.js
index 575abad..351c98f 100644
--- a/IPython/html/static/notebook/js/codemirror-ipython.js
+++ b/IPython/html/static/notebook/js/codemirror-ipython.js
@@ -15,7 +15,12 @@ CodeMirror.requireMode('python',function(){
         }
         pythonConf.name = 'python';
         pythonConf.singleOperators = new RegExp("^[\\+\\-\\*/%&|\\^~<>!\\?]");
-        pythonConf.identifiers = new RegExp("^[_A-Za-z\u00A1-\uFFFF][_A-Za-z0-9\u00A1-\uFFFF]*");
+        if (pythonConf.version === 3) {
+            console.log('setting up for python 3');
+            pythonConf.identifiers = new RegExp("^[_A-Za-z\u00A1-\uFFFF][_A-Za-z0-9\u00A1-\uFFFF]*");
+        } else if (pythonConf.version === 2) {
+            pythonConf.identifiers = new RegExp("^[_A-Za-z][_A-Za-z0-9]*");
+        }
         return CodeMirror.getMode(conf, pythonConf);
     }, 'python');