$ lsb_release -a
LSB Version:	core-2.0-amd64:core-2.0-noarch:core-3.0-amd64:core-3.0-noarch:core-3.1-amd64:core-3.1-noarch:core-3.2-amd64:core-3.2-noarch:core-4.0-amd64:core-4.0-noarch
Distributor ID:	Ubuntu
Description:	Ubuntu 12.04.1 LTS
Release:	12.04
Codename:	precise

$ hg branch
2.7

$ ./python Lib/test/test_readline.py
testHistoryUpdates (__main__.TestHistoryManipulation) ... ERROR

======================================================================
ERROR: testHistoryUpdates (__main__.TestHistoryManipulation)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "Lib/test/test_readline.py", line 16, in testHistoryUpdates
    readline.clear_history()
AttributeError: 'module' object has no attribute 'clear_history'

----------------------------------------------------------------------
Ran 1 test in 0.003s

FAILED (errors=1)
Traceback (most recent call last):
  File "Lib/test/test_readline.py", line 43, in <module>
    test_main()
  File "Lib/test/test_readline.py", line 40, in test_main
    run_unittest(TestHistoryManipulation)
  File "/art/python/cpython/Lib/test/test_support.py", line 1125, in run_unittest
    _run_suite(suite)
  File "/art/python/cpython/Lib/test/test_support.py", line 1108, in _run_suite
    raise TestFailed(err)
test.test_support.TestFailed: Traceback (most recent call last):
  File "Lib/test/test_readline.py", line 16, in testHistoryUpdates
    readline.clear_history()
AttributeError: 'module' object has no attribute 'clear_history'