remove python2 code

IPython/utils/ulinecache.py

@@ -1,7 +1,5 b''
-"""Wrapper around linecache which decodes files to unicode according to PEP 263.
-
-This is only needed for Python 2 - linecache in Python 3 does the same thing
-itself.
+"""
+Wrapper around linecache which decodes files to unicode according to PEP 263.
 """
 import functools
 import linecache
@@ -10,35 +8,9 b' import sys'
 from IPython.utils import py3compat
 from IPython.utils import openpy
 
-if py3compat.PY3:
-    getline = linecache.getline
-    
-    # getlines has to be looked up at runtime, because doctests monkeypatch it.
-    @functools.wraps(linecache.getlines)
-    def getlines(filename, module_globals=None):
-        return linecache.getlines(filename, module_globals=module_globals)
-
-else:
-    def getlines(filename, module_globals=None):
-        """Get the lines (as unicode) for a file from the cache.
-        Update the cache if it doesn't contain an entry for this file already."""
-        filename = py3compat.cast_bytes(filename, sys.getfilesystemencoding())
-        lines = linecache.getlines(filename, module_globals=module_globals)
-        
-        if (not lines) or isinstance(lines[0], str):
-            return lines
-        
-        readline = openpy._list_readline(lines)
-        try:
-            encoding, _ = openpy.detect_encoding(readline)
-        except SyntaxError:
-            encoding = 'ascii'
-        return [l.decode(encoding, 'replace') for l in lines]
+getline = linecache.getline
 
-    # This is a straight copy of linecache.getline
-    def getline(filename, lineno, module_globals=None):
-        lines = getlines(filename, module_globals)
-        if 1 <= lineno <= len(lines):
-            return lines[lineno-1]
-        else:
-            return ''
+# getlines has to be looked up at runtime, because doctests monkeypatch it.
[e-mail](linecache.getlines)
+def getlines(filename, module_globals=None):
+    return linecache.getlines(filename, module_globals=module_globals)