New submission from Serhiy Storchaka:

Tests added in b923eeaf8162 exposed a bug in str.partition() and 
str.rpartition() in 3.4 on big-endian platforms. It should exist in 3.3 too. It 
likely was fixed in 3.5 in issue23573.

http://buildbot.python.org/all/builders/PPC64%20PowerLinux%203.4/builds/913/steps/test/logs/stdio
======================================================================
FAIL: test_partition (test.test_unicode.UnicodeTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File 
"/home/shager/cpython-buildarea/3.4.edelsohn-powerlinux-ppc64/build/Lib/test/test_unicode.py",
 line 383, in test_partition
    left + right, 'partition', delim)
  File 
"/home/shager/cpython-buildarea/3.4.edelsohn-powerlinux-ppc64/build/Lib/test/string_tests.py",
 line 63, in checkequal
    realresult
AssertionError: Tuples differ: ('bbbbbbbbbaaaaaaaaa', '', '') != ('', '𐌂', 
'\x00\x00b\x00\x00\x00b\x00\x00\x00b\x00\x00\x00b\x00\x00')

First differing element 0:
bbbbbbbbbaaaaaaaaa


- ('bbbbbbbbbaaaaaaaaa', '', '')
+ ('', '𐌂', '\x00\x00b\x00\x00\x00b\x00\x00\x00b\x00\x00\x00b\x00\x00')

======================================================================
FAIL: test_rpartition (test.test_unicode.UnicodeTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File 
"/home/shager/cpython-buildarea/3.4.edelsohn-powerlinux-ppc64/build/Lib/test/test_unicode.py",
 line 399, in test_rpartition
    left + right, 'rpartition', delim)
  File 
"/home/shager/cpython-buildarea/3.4.edelsohn-powerlinux-ppc64/build/Lib/test/string_tests.py",
 line 63, in checkequal
    realresult
AssertionError: Tuples differ: ('', '', 'bbbbbbbbbaaaaaaaaa') != 
('\x00\x00\x00b\x00\x00\x00b\x00\x00\x00b\x00\x00\x00b\x00', '𐌂', '')

First differing element 0:

bbbb

- ('', '', 'bbbbbbbbbaaaaaaaaa')
+ ('\x00\x00\x00b\x00\x00\x00b\x00\x00\x00b\x00\x00\x00b\x00', '𐌂', '')

----------------------------------------------------------------------

'bbbbbbbbbaaaaaaaaa'.partition('\U00010302') returns ('', '𐌂', 
'\x00\x00b\x00\x00\x00b\x00\x00\x00b\x00\x00\x00b\x00\x00')
'bbbbbbbbbaaaaaaaaa'.rpartition('\U00010302') returns 
('\x00\x00\x00b\x00\x00\x00b\x00\x00\x00b\x00\x00\x00b\x00', '𐌂', '')

----------
assignee: serhiy.storchaka
components: Interpreter Core
messages: 239475
nosy: benjamin.peterson, ezio.melotti, haypo, lemburg, pitrou, serhiy.storchaka
priority: normal
severity: normal
stage: needs patch
status: open
title: str.partition() is broken in 3.4
type: behavior
versions: Python 3.3, Python 3.4

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue23803>
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