remove dead code

IPython/lib/pretty.py

@@ -84,7 +84,7 b' import re'
 import datetime
 from collections import deque
 
-from IPython.utils.py3compat import PY3, PYPY, cast_unicode
+from IPython.utils.py3compat import PYPY, cast_unicode
 from IPython.utils.encoding import get_stream_enc
 
 from io import StringIO
@@ -108,15 +108,7 b' def _safe_getattr(obj, attr, default=None):'
     except Exception:
         return default
 
-if PY3:
-    CUnicodeIO = StringIO
-else:
-    class CUnicodeIO(StringIO):
-        """StringIO that casts str to unicode on Python 2"""
-        def write(self, text):
-            return super(CUnicodeIO, self).write(
-                cast_unicode(text, encoding=get_stream_enc(sys.stdout)))
-
+CUnicodeIO = StringIO
 
 def pretty(obj, verbose=False, max_width=79, newline='\n', max_seq_length=MAX_SEQ_LENGTH):
     """