diff --git a/IPython/core/magics/execution.py b/IPython/core/magics/execution.py
index 7279462..6334e7a 100644
--- a/IPython/core/magics/execution.py
+++ b/IPython/core/magics/execution.py
@@ -36,7 +36,7 @@ from IPython.core.magic import (Magics, magics_class, line_magic, cell_magic,
                                 line_cell_magic, on_off, needs_local_scope)
 from IPython.testing.skipdoctest import skip_doctest
 from IPython.utils import py3compat
-from IPython.utils.py3compat import builtin_mod, PY3
+from IPython.utils.py3compat import builtin_mod
 from IPython.utils.contexts import preserve_keys
 from IPython.utils.capture import capture_output
 from IPython.utils.ipstruct import Struct
@@ -45,11 +45,8 @@ from IPython.utils.path import get_py_filename, shellglob
 from IPython.utils.timing import clock, clock2
 from warnings import warn
 from logging import error
+from io import StringIO
 
-if PY3:
-    from io import StringIO
-else:
-    from StringIO import StringIO
 
 #-----------------------------------------------------------------------------
 # Magic implementation classes
@@ -652,9 +649,6 @@ python-profiler package from non-free.""")
             args = shellglob(map(os.path.expanduser,  arg_lst[1:]))
 
         sys.argv = [filename] + args  # put in the proper filename
-        # protect sys.argv from potential unicode strings on Python 2:
-        if not py3compat.PY3:
-            sys.argv = [ py3compat.cast_bytes(a) for a in sys.argv ]
 
         if 'i' in opts:
             # Run in user's interactive namespace
diff --git a/IPython/core/tests/test_splitinput.py b/IPython/core/tests/test_splitinput.py
index c789e10..170d923 100644
--- a/IPython/core/tests/test_splitinput.py
+++ b/IPython/core/tests/test_splitinput.py
@@ -28,10 +28,7 @@ tests = [
     ('??%%hist4', ('', '??', '%%hist4', '')),
     ('?x*', ('', '?', 'x*', '')),
     ]
-if py3compat.PY3:
-    tests.append((u"Pérez Fernando", (u'', u'', u'Pérez', u'Fernando')))
-else:
-    tests.append((u"Pérez Fernando", (u'', u'', u'P', u'érez Fernando')))
+tests.append((u"Pérez Fernando", (u'', u'', u'Pérez', u'Fernando')))
 
 def test_split_user_input():
     return tt.check_pairs(split_user_input, tests)
diff --git a/IPython/core/ultratb.py b/IPython/core/ultratb.py
index 3ccbb81..352c691 100644
--- a/IPython/core/ultratb.py
+++ b/IPython/core/ultratb.py
@@ -299,7 +299,10 @@ def getargs(co):
 
 # Monkeypatch inspect to apply our bugfix.
 def with_patch_inspect(f):
-    """decorator for monkeypatching inspect.findsource"""
+    """
+    Deprecated since IPython 6.0
+    decorator for monkeypatching inspect.findsource
+    """
 
     def wrapped(*args, **kwargs):
         save_findsource = inspect.findsource
@@ -315,16 +318,6 @@ def with_patch_inspect(f):
     return wrapped
 
 
-if py3compat.PY3:
-    fixed_getargvalues = inspect.getargvalues
-else:
-    # Fixes for https://github.com/ipython/ipython/issues/8293
-    #       and https://github.com/ipython/ipython/issues/8205.
-    # The relevant bug is caused by failure to correctly handle anonymous tuple
-    # unpacking, which only exists in Python 2.
-    fixed_getargvalues = with_patch_inspect(inspect.getargvalues)
-
-
 def fix_frame_records_filenames(records):
     """Try to fix the filenames in each record from inspect.getinnerframes().
 
@@ -879,7 +872,7 @@ class VerboseTB(TBTools):
 
         file = py3compat.cast_unicode(file, util_path.fs_encoding)
         link = tpl_link % file
-        args, varargs, varkw, locals = fixed_getargvalues(frame)
+        args, varargs, varkw, locals = inspect.getargvalues(frame)
 
         if func == '?':
             call = ''
diff --git a/IPython/terminal/ptutils.py b/IPython/terminal/ptutils.py
index 84515e1..d144005 100644
--- a/IPython/terminal/ptutils.py
+++ b/IPython/terminal/ptutils.py
@@ -10,8 +10,6 @@ not to be used outside IPython.
 import unicodedata
 from wcwidth import wcwidth
 
-from IPython.utils.py3compat import PY3
-
 from IPython.core.completer import IPCompleter
 from prompt_toolkit.completion import Completer, Completion
 from prompt_toolkit.layout.lexers import Lexer
@@ -78,7 +76,7 @@ class IPythonPTLexer(Lexer):
     """
     def __init__(self):
         l = pygments_lexers
-        self.python_lexer = PygmentsLexer(l.Python3Lexer if PY3 else l.PythonLexer)
+        self.python_lexer = PygmentsLexer(l.Python3Lexer)
         self.shell_lexer = PygmentsLexer(l.BashLexer)
 
         self.magic_lexers = {
diff --git a/IPython/utils/tests/test_io.py b/IPython/utils/tests/test_io.py
index 5f9e87e..b23a4a3 100644
--- a/IPython/utils/tests/test_io.py
+++ b/IPython/utils/tests/test_io.py
@@ -9,6 +9,7 @@ import io as stdlib_io
 import os.path
 import stat
 import sys
+from io import StringIO
 
 from subprocess import Popen, PIPE
 import unittest
@@ -17,14 +18,9 @@ import nose.tools as nt
 
 from IPython.testing.decorators import skipif, skip_win32
 from IPython.utils.io import Tee, capture_output
-from IPython.utils.py3compat import doctest_refactor_print, PY3
+from IPython.utils.py3compat import doctest_refactor_print
 from IPython.utils.tempdir import TemporaryDirectory
 
-if PY3:
-    from io import StringIO
-else:
-    from StringIO import StringIO
-
 
 def test_tee_simple():
     "Very simple check with stdout only"