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(3.1 not checked because it seems not to have test_argparse)
Python 2.7 or 3.2, WinXP these pass:
C:\Programs\Python27>python -m test.regrtest test_argparse
C:\Programs\Python32>python -m test test_argparse
[1/1] test_argparse
1 test OK.
C:\Programs\Python32>python -m test -v test_argparse
C:\Programs\Python32>python -c "from test import test_argparse as t; t.test_main()"
Ran 1536 tests in 6.188s
OK
but interactively (command window interpreter or IDLE shell, 3.2 or 2.7)
>>> from test import test_argparse as t; t.test_main()
gives two failures related to extra spaces in usage string (I added a couple of newlines for clarity). I have no idea if problem is with argparse, test_argparse, regrtest, unittest, or interactive versus batch mode.
======================================================================
FAIL: test_groups_parents (test.test_argparse.TestParentParsers)
----------------------------------------------------------------------
Traceback (most recent call last):
 File "C:\Programs\Python32\lib\test\test_argparse.py", line 2217, in test_groups_parents
 '''.format(self.main_program)))
 File "C:\Programs\Python32\lib\test\test_argparse.py", line 29, in assertEqual
 super(TestCase, self).assertEqual(obj1, obj2)
AssertionError:
'usage: [-h] [-w W] [-x X] [-y Y | -z Z]\n\noptional arguments:\n -h, --help s [truncated]... != 
'usage: [-h] [-w W] [-x X] [-y Y | -z Z]\n\noptional arguments:\n -h, --help [truncated]...
- usage: [-h] [-w W] [-x X] [-y Y | -z Z]
+ usage: [-h] [-w W] [-x X] [-y Y | -z Z]
? +
 
 optional arguments:
 -h, --help show this help message and exit
 -y Y
 -z Z
 
 g:
 gd
 
 -w W
 -x X
======================================================================
FAIL: test_parent_help (test.test_argparse.TestParentParsers)
----------------------------------------------------------------------
Traceback (most recent call last):
 File "C:\Programs\Python32\lib\test\test_argparse.py", line 2188, in test_parent_help
 '''.format(self.main_program)))
 File "C:\Programs\Python32\lib\test\test_argparse.py", line 29, in assertEqual
 super(TestCase, self).assertEqual(obj1, obj2)
AssertionError:
'usage: [-h] [-b B] [--d D] [--w W] [-y Y] a z\n\npositional arguments:\n a\n [truncated]... != 
'usage: [-h] [-b B] [--d D] [--w W] [-y Y] a z\n\npositional arguments:\n a\n [truncated]...
- usage: [-h] [-b B] [--d D] [--w W] [-y Y] a z
+ usage: [-h] [-b B] [--d D] [--w W] [-y Y] a z
? +
 
 positional arguments:
 a
 z
 
 optional arguments:
 -h, --help show this help message and exit
 -b B
 --w W
 
 c:
 --d D
 
 x:
 -y Y
----------------------------------------------------------------------
Ran 1536 tests in 29.438s
FAILED (failures=2)
Traceback (most recent call last):
 File "<pyshell#11>", line 1, in <module>
 from test import test_argparse as t; t.test_main()
 File "C:\Programs\Python32\lib\test\test_argparse.py", line 4423, in test_main
 support.run_unittest(__name__)
 File "C:\Programs\Python32\lib\test\support.py", line 1145, in run_unittest
 _run_suite(suite)
 File "C:\Programs\Python32\lib\test\support.py", line 1128, in _run_suite
 raise TestFailed(err)
test.support.TestFailed: multiple errors occurred