Note: only the relevant parts of r79474 are merged.

Merged revisions 78793,78798-78799,78977,79095,79196,79474 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/branches/py3k

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  r78793 | florent.xicluna | 2010-03-08 13:25:35 +0100 (lun, 08 mar 2010) | 2 lines

  Fix macpath to deal with bytes
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  r78798 | florent.xicluna | 2010-03-08 14:32:17 +0100 (lun, 08 mar 2010) | 18 lines

  Merged revisions 78777,78787,78790 via svnmerge from
  svn+ssh://pythondev@svn.python.org/python/trunk

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    r78777 | florent.xicluna | 2010-03-08 00:49:03 +0100 (lun, 08 mar 2010) | 4 lines

    Backport the Popen.poll() protection from subprocess to multiprocessing. See #1731717.
    It should fix transient failures on test_multiprocessing.
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    r78787 | florent.xicluna | 2010-03-08 08:21:16 +0100 (lun, 08 mar 2010) | 2 lines

    Don't fail on a debug() statement, if the worker PID is (still) None.
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    r78790 | florent.xicluna | 2010-03-08 12:01:39 +0100 (lun, 08 mar 2010) | 2 lines

    On finalize, don't try to join not started process.
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  r78799 | florent.xicluna | 2010-03-08 15:44:41 +0100 (lun, 08 mar 2010) | 2 lines

  Fix ntpath abspath to deal with bytes.
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  r78977 | florent.xicluna | 2010-03-15 14:14:39 +0100 (lun, 15 mar 2010) | 2 lines

  Fix \xhh specs, #1889.  (an oversight of r60193, r60210).
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  r79095 | florent.xicluna | 2010-03-19 15:40:31 +0100 (ven, 19 mar 2010) | 2 lines

  Rename test.test_support to test.support for 3.x.
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  r79196 | florent.xicluna | 2010-03-21 13:29:50 +0100 (dim, 21 mar 2010) | 9 lines

  Merged revisions 79195 via svnmerge from
  svn+ssh://pythondev@svn.python.org/python/trunk

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    r79195 | florent.xicluna | 2010-03-21 13:27:20 +0100 (dim, 21 mar 2010) | 2 lines

    Issue #8179: Fix macpath.realpath() on a non-existing path.
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  r79474 | florent.xicluna | 2010-03-28 01:25:02 +0100 (dim, 28 mar 2010) | 33 lines

  Merged revisions 79297,79310,79382,79425-79427,79450 via svnmerge from
  svn+ssh://pythondev@svn.python.org/python/trunk

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    r79297 | florent.xicluna | 2010-03-22 18:18:18 +0100 (lun, 22 mar 2010) | 2 lines

    #7668: Fix test_httpservers failure when sys.executable contains non-ASCII bytes.
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    r79310 | florent.xicluna | 2010-03-22 23:52:11 +0100 (lun, 22 mar 2010) | 2 lines

    Issue #8205: Remove the "Modules" directory from sys.path when Python is running from the build directory (POSIX only).
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    r79382 | florent.xicluna | 2010-03-24 20:33:25 +0100 (mer, 24 mar 2010) | 2 lines

    Skip tests which depend on multiprocessing.sharedctypes, if _ctypes is not available.
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    r79425 | florent.xicluna | 2010-03-25 21:32:07 +0100 (jeu, 25 mar 2010) | 2 lines

    Syntax cleanup `== None` -> `is None`
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    r79426 | florent.xicluna | 2010-03-25 21:33:49 +0100 (jeu, 25 mar 2010) | 2 lines

    #8207: Fix test_pep277 on OS X
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    r79427 | florent.xicluna | 2010-03-25 21:39:10 +0100 (jeu, 25 mar 2010) | 2 lines

    Fix test_unittest and test_warnings when running "python -Werror -m test.regrtest"
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    r79450 | florent.xicluna | 2010-03-26 20:32:44 +0100 (ven, 26 mar 2010) | 2 lines

    Ensure that the failed or unexpected tests are sorted before printing.
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1 files changed, 1 insertions, 1 deletions

diff --git a/Lib/idlelib/PyShell.py b/Lib/idlelib/PyShell.py
index 0136089..0898dfe 100644
--- a/Lib/idlelib/PyShell.py
+++ b/Lib/idlelib/PyShell.py
@@ -347,7 +347,7 @@ class ModifiedInterpreter(InteractiveInterpreter):
     rpcpid = None
 
     def spawn_subprocess(self):
-        if self.subprocess_arglist == None:
+        if self.subprocess_arglist is None:
             self.subprocess_arglist = self.build_subprocess_arglist()
         args = self.subprocess_arglist
         self.rpcpid = os.spawnv(os.P_NOWAIT, sys.executable, args)