ipython · Carreau · Jul 7, 2026 · Jul 7, 2026 · Jul 7, 2026 · Jul 7, 2026
diff --git a/IPython/core/interactiveshell.py b/IPython/core/interactiveshell.py
@@ -87,7 +87,7 @@
 from IPython.display import display
 from IPython.paths import get_ipython_dir
 from IPython.testing.skipdoctest import skip_doctest
-from IPython.utils import PyColorize, io, openpy, py3compat
+from IPython.utils import PyColorize, io, openpy
 from IPython.utils.decorators import undoc
 from IPython.utils.io import ask_yes_no
 from IPython.utils.ipstruct import Struct
@@ -2866,11 +2866,19 @@ def _user_obj_error(self):
         etype, evalue, tb = self._get_exc_info()
         stb = self.InteractiveTB.get_exception_only(etype, evalue)
 
+        try:
+            evalue_str = str(evalue)
+        except UnicodeError:
+            try:
+                evalue_str = repr(evalue)
+            except UnicodeError:
+                evalue_str = "Unrecoverably corrupt evalue"
+
         exc_info = {
             "status": "error",
             "traceback": stb,
             "ename": etype.__name__,
-            "evalue": py3compat.safe_unicode(evalue),
+            "evalue": evalue_str,
         }
 
         return exc_info
@@ -2974,10 +2982,17 @@ def safe_execfile(self, fname, *where, exit_ignore=False, raise_exceptions=False
         # Python inserts the script's directory into sys.path
         dname = str(fname.parent)
 
+        def execfile(fname, glob, loc=None, compiler=None):
+            __tracebackhide__ = "__ipython_bottom__"
+            loc = loc if (loc is not None) else glob
+            with open(fname, "rb") as f:
+                compiler = compiler or compile
+                exec(compiler(f.read(), fname, "exec"), glob, loc)
+
         with prepended_to_syspath(dname), self.builtin_trap:
             try:
                 glob, loc = (where + (None, ))[:2]
-                py3compat.execfile(
+                execfile(
                     fname, glob, loc,
                     self.compile if shell_futures else None)
             except SystemExit as status:

diff --git a/IPython/core/page.py b/IPython/core/page.py
@@ -29,7 +29,6 @@
 from IPython.utils.data import chop
 from IPython.utils.process import system
 from IPython.utils.terminal import get_terminal_size
-from IPython.utils import py3compat
 
 
 def display_page(strng, start=0, screen_lines=25):
@@ -340,7 +339,7 @@ def page_more():
         return result
 else:
     def page_more():
-        ans = py3compat.input('---Return to continue, q to quit--- ')
+        ans = input('---Return to continue, q to quit--- ')
         if ans.lower().startswith('q'):
             return False
         else:

diff --git a/IPython/core/tbtools.py b/IPython/core/tbtools.py
@@ -14,7 +14,6 @@
 from IPython import get_ipython
 from IPython.core import debugger
 from IPython.utils import path as util_path
-from IPython.utils import py3compat
 from IPython.utils.PyColorize import Theme, TokenStream, theme_table
 
 _sentinel = object()
@@ -180,6 +179,7 @@ def _tokens_filename(
     em: wether bold or not
     file : str
     """
+    assert file is None or isinstance(file, str)
     Normal = Token.NormalEm if em else Token.Normal
     Filename = Token.FilenameEm if em else Token.Filename
     ipinst = get_ipython()
@@ -202,9 +202,8 @@ def _tokens_filename(
                 (Filename, f", line {lineno}"),
             ]
     else:
-        name = util_path.compress_user(
-            py3compat.cast_unicode(file or "", util_path.fs_encoding)
-        )
+        file_str = file or ""
+        name = util_path.compress_user(file_str)
         if lineno is None:
             return [
                 (Normal, "File "),

diff --git a/IPython/lib/clipboard.py b/IPython/lib/clipboard.py
@@ -5,7 +5,7 @@
 import subprocess
 
 from IPython.core.error import TryNext
-import IPython.utils.py3compat as py3compat
+from IPython.utils.encoding import DEFAULT_ENCODING
 
 
 class ClipboardEmpty(ValueError):
@@ -28,7 +28,7 @@ def win32_clipboard_get():
     except (TypeError, win32clipboard.error):
         try:
             text = win32clipboard.GetClipboardData(win32clipboard.CF_TEXT)
-            text = py3compat.cast_unicode(text, py3compat.DEFAULT_ENCODING)
+            text = text if isinstance(text, str) else text.decode(DEFAULT_ENCODING, "replace")
         except (TypeError, win32clipboard.error) as e:
             raise ClipboardEmpty from e
     finally:
@@ -44,7 +44,7 @@ def osx_clipboard_get() -> str:
     bytes_, stderr = p.communicate()
     # Text comes in with old Mac \r line endings. Change them to \n.
     bytes_ = bytes_.replace(b'\r', b'\n')
-    text = py3compat.decode(bytes_)
+    text = bytes_.decode(DEFAULT_ENCODING, "replace")
     return text
 
 
@@ -68,7 +68,7 @@ def tkinter_clipboard_get():
         raise ClipboardEmpty from e
     finally:
         root.destroy()
-    text = py3compat.cast_unicode(text, py3compat.DEFAULT_ENCODING)
+    text = text if isinstance(text, str) else text.decode(DEFAULT_ENCODING, "replace")
     return text
 
 
@@ -95,7 +95,7 @@ def wayland_clipboard_get():
         raise ClipboardEmpty
 
     try:
-        text = py3compat.decode(raw)
+        text = raw.decode(DEFAULT_ENCODING, "replace")
     except UnicodeDecodeError as e:
         raise ClipboardEmpty from e
 

diff --git a/IPython/lib/demo.py b/IPython/lib/demo.py
@@ -188,7 +188,6 @@
 
 from IPython.utils.text import marquee
 from IPython.utils import openpy
-from IPython.utils import py3compat
 __all__ = ['Demo','IPythonDemo','LineDemo','IPythonLineDemo','DemoError']
 
 class DemoError(Exception): pass
@@ -475,7 +474,7 @@ def __call__(self,index=None):
                     print(marquee('output:'))
                 else:
                     print(marquee('Press <q> to quit, <Enter> to execute...'), end=' ')
-                    ans = py3compat.input().strip()
+                    ans = input().strip()
                     if ans:
                         print(marquee('Block NOT executed'))
                         return
@@ -643,7 +642,7 @@ def slide(file_path, noclear=False, format_rst=True, formatter="terminal",
     while not demo.finished:
         demo()
         try:
-            py3compat.input('\n' + delimiter)
+            input('\n' + delimiter)
         except KeyboardInterrupt:
             exit(1)
 

diff --git a/IPython/lib/editorhooks.py b/IPython/lib/editorhooks.py
@@ -12,7 +12,6 @@
 
 from IPython import get_ipython
 from IPython.core.error import TryNext
-from IPython.utils import py3compat
 
 
 def install_editor(template, wait=False):
@@ -55,7 +54,7 @@ def call_editor(self, filename, line=0):
         if proc.wait() != 0:
             raise TryNext()
         if wait:
-            py3compat.input("Press Enter when done editing:")
+            input("Press Enter when done editing:")
 
     get_ipython().set_hook('editor', call_editor)
     get_ipython().editor = template

diff --git a/IPython/lib/pretty.py b/IPython/lib/pretty.py
@@ -96,15 +96,14 @@ def _repr_pretty_(self, p, cycle):
 from contextlib import contextmanager
 import datetime
 import os
+import platform
 import re
 import sys
 import types
 from collections import deque
 from inspect import signature
 from io import StringIO
 
-from IPython.utils.py3compat import PYPY
-
 from typing import Dict
 
 # Allow pretty-printing of functions with PEP-649 annotations
@@ -708,7 +707,7 @@ def _super_pprint(obj, p, cycle):
     p.pretty(obj.__thisclass__)
     p.text(',')
     p.breakable()
-    if PYPY: # In PyPy, super() objects don't have __self__ attributes
+    if platform.python_implementation() == "PyPy": # In PyPy, super() objects don't have __self__ attributes
         dself = obj.__repr__.__self__
         p.pretty(None if dself is obj else dself)
     else:

diff --git a/IPython/terminal/interactiveshell.py b/IPython/terminal/interactiveshell.py
@@ -12,7 +12,6 @@
     display_formatter_default_active_types,
     terminal_default_mime_renderers,
 )
-from IPython.utils.py3compat import input
 from IPython.utils.PyColorize import theme_table
 from IPython.utils.terminal import toggle_set_term_title, set_term_title, restore_term_title
 from IPython.utils.process import abbrev_cwd

diff --git a/IPython/terminal/magics.py b/IPython/terminal/magics.py
@@ -13,9 +13,8 @@
 from IPython.lib.clipboard import ClipboardEmpty
 from IPython.testing.skipdoctest import skip_doctest
 from IPython.utils.text import SList, strip_email_quotes
-from IPython.utils import py3compat
 
-def get_pasted_lines(sentinel, l_input=py3compat.input, quiet=False):
+def get_pasted_lines(sentinel, l_input=input, quiet=False):
     """ Yield pasted lines until the user enters the given sentinel value.
     """
     if not quiet:

diff --git a/IPython/testing/tools.py b/IPython/testing/tools.py
@@ -24,7 +24,7 @@
 from traitlets.config.loader import Config
 from IPython.utils.process import get_output_error_code
 from IPython.utils.io import temp_pyfile, Tee
-from IPython.utils import py3compat
+from IPython.utils.encoding import DEFAULT_ENCODING
 
 from . import decorators as dec
 from . import skipdoctest
@@ -207,8 +207,8 @@ def ipexec(fname: str, options: list[str] | None=None, commands: tuple[str, ...]
         if not isinstance(v, str):
             print(k, v)
     p = Popen(full_cmd, stdout=PIPE, stderr=PIPE, stdin=PIPE, env=env)
-    out, err = p.communicate(input=py3compat.encode('\n'.join(commands)) or None)
-    out, err = py3compat.decode(out), py3compat.decode(err)
+    out, err = p.communicate(input=('\n'.join(commands).encode(DEFAULT_ENCODING, "replace")) or None)
+    out, err = out.decode(DEFAULT_ENCODING, "replace"), err.decode(DEFAULT_ENCODING, "replace")
     # `import readline` causes 'ESC[?1034h' to be output sometimes,
     # so strip that out before doing comparisons
     if out:

diff --git a/IPython/utils/_process_common.py b/IPython/utils/_process_common.py
@@ -23,7 +23,7 @@
 
 _T = TypeVar("_T")
 
-from IPython.utils import py3compat
+from .encoding import DEFAULT_ENCODING
 
 #-----------------------------------------------------------------------------
 # Function definitions
@@ -140,7 +140,7 @@ def getoutput(cmd: str | list[str]) -> str:
     out = process_handler(cmd, lambda p: p.communicate()[0], subprocess.STDOUT)
     if out is None:
         return ''
-    return py3compat.decode(out)
+    return out.decode(DEFAULT_ENCODING, "replace")
 
 
 def getoutputerror(cmd: str | list[str]) -> tuple[str, str]:
@@ -183,7 +183,7 @@ def get_output_error_code(cmd: str | list[str]) -> tuple[str, str, int | None]:
     if result is None:
         return '', '', None
     (out, err), p = result
-    return py3compat.decode(out), py3compat.decode(err), p.returncode
+    return out.decode(DEFAULT_ENCODING, "replace"), err.decode(DEFAULT_ENCODING, "replace"), p.returncode
 
 def arg_split(commandline: str, posix: bool = False, strict: bool = True) -> list[str]:
     """Split a command line's arguments in a shell-like manner.

diff --git a/IPython/utils/_process_win32.py b/IPython/utils/_process_win32.py
@@ -15,7 +15,6 @@
 from types import TracebackType
 from typing import List, Optional
 
-from . import py3compat
 from ._process_common import arg_split as py_arg_split
 
 from ._process_common import process_handler, read_no_interrupt
@@ -156,7 +155,7 @@ def getoutput(cmd: str) -> str:
 
     if out is None:
         out = b""
-    return py3compat.decode(out)
+    return out.decode(DEFAULT_ENCODING, "replace")
 
 
 try:

diff --git a/IPython/utils/py3compat.py b/IPython/utils/py3compat.py
diff --git a/tests/test_debugger.py b/tests/test_debugger.py
@@ -16,12 +16,19 @@
 from IPython.core import debugger
 from IPython.testing import IPYTHON_TESTING_TIMEOUT_SCALE
 from IPython.testing.decorators import skip_win32
-from IPython.utils import py3compat
 import pytest
 
-# -----------------------------------------------------------------------------
+# Helper for executing files with proper debugger frame marking
+def execfile(fname, glob, loc=None, compiler=None):
+    __tracebackhide__ = "__ipython_bottom__"
+    loc = loc if (loc is not None) else glob
+    with open(fname, "rb") as f:
+        compiler_fn = compiler or compile
+        exec(compiler_fn(f.read(), fname, "exec"), glob, loc)
+
+
 # Helper classes, from CPython's Pdb test suite
-# -----------------------------------------------------------------------------
+#
 
 
 class _FakeInput(object):
@@ -304,7 +311,7 @@ def test_execfile_marks_debugger_internal_frames_hidden():
         )
 
         with pytest.raises(RuntimeError) as exc_info:
-            py3compat.execfile(script, {})
+            execfile(script, {})
 
     ipdb = debugger.Pdb()
     stack, _ = ipdb.get_stack(None, exc_info.value.__traceback__)