Backport PR #2638: Fix %paste in Python 3 on Mac

Fixes  #2637.

IPython/lib/clipboard.py

@@ -1,54 +1,54 b''
 """ Utilities for accessing the platform's clipboard.
 """
 
 import subprocess
 import sys
 
 from IPython.core.error import TryNext
 
 
 def win32_clipboard_get():
     """ Get the current clipboard's text on Windows.
 
     Requires Mark Hammond's pywin32 extensions.
     """
     try:
         import win32clipboard
     except ImportError:
         raise TryNext("Getting text from the clipboard requires the pywin32 "
                       "extensions: http://sourceforge.net/projects/pywin32/")
     win32clipboard.OpenClipboard()
     text = win32clipboard.GetClipboardData(win32clipboard.CF_TEXT)
     # FIXME: convert \r\n to \n?
     win32clipboard.CloseClipboard()
     return text
 
 def osx_clipboard_get():
     """ Get the clipboard's text on OS X.
     """
     p = subprocess.Popen(['pbpaste', '-Prefer', 'ascii'],
         stdout=subprocess.PIPE)
     text, stderr = p.communicate()
     # Text comes in with old Mac \r line endings. Change them to \n.
-    text = text.replace('\r', '\n')
+    text = text.replace(b'\r', b'\n')
     return text
 
 def tkinter_clipboard_get():
     """ Get the clipboard's text using Tkinter.
 
     This is the default on systems that are not Windows or OS X. It may
     interfere with other UI toolkits and should be replaced with an
     implementation that uses that toolkit.
     """
     try:
         import Tkinter
     except ImportError:
         raise TryNext("Getting text from the clipboard on this platform "
                       "requires Tkinter.")
     root = Tkinter.Tk()
     root.withdraw()
     text = root.clipboard_get()
     root.destroy()
     return text