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This doesn't happen in verbose mode, because stdout isn't checked:
$ ./python -m test.regrtest test_gdb_sample
test_gdb_sample
test test_gdb_sample produced unexpected output:
**********************************************************************
42
**********************************************************************
1 test failed:
 test_gdb_sample

Sorry about that.
"test_gdb_sample.py" is merely a sample script for use by "test_gdb.py" (see issue 8032); it's not intended to do anything useful by itself (though it does need a "print" invocation, since test_gdb.py uses a breakpoint in PyObject_Print).
I would probably be simplest to rename it so it doesn't have a "test_" prefix.
How about "sample_for_test_gdb.py", or somesuch?

> I would probably be simplest to rename it so it doesn't have a "test_" prefix.
Indeed. Otherwise it gets caught and executed by regrtest as part of the
standard test suite.
> How about "sample_for_test_gdb.py", or somesuch?
Shorter would be better :)
For example gdb_sample.py, gdb_fodder.py...

"gdb_sample.py" as a name works for me. I don't have commit rights to SVN so I can't perform the rename myself.
(Note that due to issue 8279 the file isn't actually used at the moment by test_gdb.py so it should be safe to rename. I have a patch attached to that latter bug; I'll fix up the patch after that file is renamed).

> (Note that due to issue 8279 the file isn't actually used at the moment 
> by test_gdb.py so it should be safe to rename. I have a patch attached 
> to that latter bug; I'll fix up the patch after that file is renamed).
Thank you, this is done in r79557.

test_gdb.py refers to test_gdb_sample.py instead of gdb_sample.py. Attached patch fixes that.
But then I get new errors:
---------------
...
Verify the pretty-printing of unicode values ... ok 
test_basic_command (__main__.PyListTests) 
Verify that the "py-list" command works ... FAIL 
test_one_abs_arg (__main__.PyListTests) 
Verify the "py-list" command with one absolute argument ... FAIL 
test_two_abs_args (__main__.PyListTests) 
Verify the "py-list" command with two absolute arguments ... FAIL 
test_down_at_bottom (__main__.StackNavigationTests) 
Verify handling of "py-down" at the bottom of the stack ... FAIL 
test_pyup_command (__main__.StackNavigationTests) 
Verify that the "py-up" command works ... FAIL 
test_up_at_top (__main__.StackNavigationTests) 
Verify handling of "py-up" at the top of the stack ... FAIL 
test_up_then_down (__main__.StackNavigationTests) 
Verify "py-up" followed by "py-down" ... FAIL 
test_basic_command (__main__.PyBtTests) 
Verify that the "py-bt" command works ... FAIL 
test_basic_command (__main__.PyPrintTests) 
Verify that the "py-print" command works ... FAIL 
test_print_after_up (__main__.PyPrintTests) ... FAIL 
test_printing_builtin (__main__.PyPrintTests) ... FAIL 
test_printing_global (__main__.PyPrintTests) ... FAIL 
test_basic_command (__main__.PyLocalsTests) ... FAIL 
test_locals_after_up (__main__.PyLocalsTests) ... FAIL 
======================================================================
FAIL: test_basic_command (__main__.PyListTests) 
Verify that the "py-list" command works 
----------------------------------------------------------------------
Traceback (most recent call last): 
 File "Lib/test/test_gdb.py", line 535, in test_basic_command 
 cmds_after_breakpoint=['py-list']) 
 File "Lib/test/test_gdb.py", line 111, in get_stack_trace 
 self.assertEquals(err, '') 
AssertionError: "Error occurred in Python command: 'gdb.Frame' object has no attribute 'function'\n" != ''
======================================================================
FAIL: test_one_abs_arg (__main__.PyListTests) 
Verify the "py-list" command with one absolute argument 
----------------------------------------------------------------------
Traceback (most recent call last): 
 File "Lib/test/test_gdb.py", line 552, in test_one_abs_arg 
 cmds_after_breakpoint=['py-list 9']) 
 File "Lib/test/test_gdb.py", line 111, in get_stack_trace 
 self.assertEquals(err, '') 
AssertionError: "Error occurred in Python command: 'gdb.Frame' object has no attribute 'function'\n" != ''
======================================================================
FAIL: test_two_abs_args (__main__.PyListTests) 
Verify the "py-list" command with two absolute arguments 
----------------------------------------------------------------------
Traceback (most recent call last): 
 File "Lib/test/test_gdb.py", line 565, in test_two_abs_args 
 cmds_after_breakpoint=['py-list 1,3']) 
 File "Lib/test/test_gdb.py", line 111, in get_stack_trace 
 self.assertEquals(err, '') 
AssertionError: "Error occurred in Python command: 'gdb.Frame' object has no attribute 'function'\n" != ''
======================================================================
FAIL: test_down_at_bottom (__main__.StackNavigationTests) 
Verify handling of "py-down" at the bottom of the stack 
----------------------------------------------------------------------
Traceback (most recent call last): 
 File "Lib/test/test_gdb.py", line 588, in test_down_at_bottom 
 cmds_after_breakpoint=['py-down']) 
 File "Lib/test/test_gdb.py", line 111, in get_stack_trace 
 self.assertEquals(err, '') 
AssertionError: "Error occurred in Python command: 'gdb.Frame' object has no attribute 'function'\n" != ''
======================================================================
FAIL: test_pyup_command (__main__.StackNavigationTests) 
Verify that the "py-up" command works 
----------------------------------------------------------------------
Traceback (most recent call last): 
 File "Lib/test/test_gdb.py", line 578, in test_pyup_command 
 cmds_after_breakpoint=['py-up']) 
 File "Lib/test/test_gdb.py", line 111, in get_stack_trace 
 self.assertEquals(err, '') 
AssertionError: "Error occurred in Python command: 'gdb.Frame' object has no attribute 'function'\n" != ''
======================================================================
FAIL: test_up_at_top (__main__.StackNavigationTests) 
Verify handling of "py-up" at the top of the stack 
----------------------------------------------------------------------
Traceback (most recent call last): 
 File "Lib/test/test_gdb.py", line 595, in test_up_at_top 
 cmds_after_breakpoint=['py-up'] * 4) 
 File "Lib/test/test_gdb.py", line 111, in get_stack_trace 
 self.assertEquals(err, '') 
AssertionError: "Error occurred in Python command: 'gdb.Frame' object has no attribute 'function'\nError occurred in Python command: 'gdb.Frame' object has no attribute 'function'\nError occurred in Python command: 'gdb.Frame' object has no attribute 'function'\nError occurred in Python command: 'gdb.Frame' object has no attribute 'function'\n" != '' 
======================================================================
FAIL: test_up_then_down (__main__.StackNavigationTests) 
Verify "py-up" followed by "py-down" 
----------------------------------------------------------------------
Traceback (most recent call last): 
 File "Lib/test/test_gdb.py", line 602, in test_up_then_down 
 cmds_after_breakpoint=['py-up', 'py-down']) 
 File "Lib/test/test_gdb.py", line 111, in get_stack_trace 
 self.assertEquals(err, '') 
AssertionError: "Error occurred in Python command: 'gdb.Frame' object has no attribute 'function'\nError occurred in Python command: 'gdb.Frame' object has no attribute 'function'\n" != '' 
======================================================================
FAIL: test_basic_command (__main__.PyBtTests) 
Verify that the "py-bt" command works 
----------------------------------------------------------------------
Traceback (most recent call last): 
 File "Lib/test/test_gdb.py", line 615, in test_basic_command 
 cmds_after_breakpoint=['py-bt']) 
 File "Lib/test/test_gdb.py", line 111, in get_stack_trace 
 self.assertEquals(err, '') 
AssertionError: "Error occurred in Python command: 'gdb.Frame' object has no attribute 'function'\n" != ''
======================================================================
FAIL: test_basic_command (__main__.PyPrintTests) 
Verify that the "py-print" command works 
----------------------------------------------------------------------
Traceback (most recent call last): 
 File "Lib/test/test_gdb.py", line 630, in test_basic_command 
 cmds_after_breakpoint=['py-print args']) 
 File "Lib/test/test_gdb.py", line 111, in get_stack_trace 
 self.assertEquals(err, '') 
AssertionError: "Error occurred in Python command: 'gdb.Frame' object has no attribute 'function'\n" != ''
======================================================================
FAIL: test_print_after_up (__main__.PyPrintTests) 
----------------------------------------------------------------------
Traceback (most recent call last): 
 File "Lib/test/test_gdb.py", line 636, in test_print_after_up 
 cmds_after_breakpoint=['py-up', 'py-print c', 'py-print b', 'py-print a'])
 File "Lib/test/test_gdb.py", line 111, in get_stack_trace 
 self.assertEquals(err, '') 
AssertionError: "Error occurred in Python command: 'gdb.Frame' object has no attribute 'function'\nError occurred in Python command: 'gdb.Frame' object has no attribute 'function'\nError occurred in Python command: 'gdb.Frame' object has no attribute 'function'\nError occurred in Python command: 'gdb.Frame' object has no attribute 'function'\n" != '' 
======================================================================
FAIL: test_printing_builtin (__main__.PyPrintTests) 
----------------------------------------------------------------------
Traceback (most recent call last): 
 File "Lib/test/test_gdb.py", line 648, in test_printing_builtin 
 cmds_after_breakpoint=['py-print len']) 
 File "Lib/test/test_gdb.py", line 111, in get_stack_trace 
 self.assertEquals(err, '') 
AssertionError: "Error occurred in Python command: 'gdb.Frame' object has no attribute 'function'\n" != ''
======================================================================
FAIL: test_printing_global (__main__.PyPrintTests) 
----------------------------------------------------------------------
Traceback (most recent call last): 
 File "Lib/test/test_gdb.py", line 642, in test_printing_global 
 cmds_after_breakpoint=['py-print __name__']) 
 File "Lib/test/test_gdb.py", line 111, in get_stack_trace 
 self.assertEquals(err, '') 
AssertionError: "Error occurred in Python command: 'gdb.Frame' object has no attribute 'function'\n" != ''
======================================================================
FAIL: test_basic_command (__main__.PyLocalsTests) 
----------------------------------------------------------------------
Traceback (most recent call last): 
 File "Lib/test/test_gdb.py", line 655, in test_basic_command 
 cmds_after_breakpoint=['py-locals']) 
 File "Lib/test/test_gdb.py", line 111, in get_stack_trace 
 self.assertEquals(err, '') 
AssertionError: "Error occurred in Python command: 'gdb.Frame' object has no attribute 'function'\n" != ''
======================================================================
FAIL: test_locals_after_up (__main__.PyLocalsTests) 
----------------------------------------------------------------------
Traceback (most recent call last): 
 File "Lib/test/test_gdb.py", line 661, in test_locals_after_up 
 cmds_after_breakpoint=['py-up', 'py-locals']) 
 File "Lib/test/test_gdb.py", line 111, in get_stack_trace 
 self.assertEquals(err, '') 
AssertionError: "Error occurred in Python command: 'gdb.Frame' object has no attribute 'function'\nError occurred in Python command: 'gdb.Frame' object has no attribute 'function'\n" != '' 
---------------
I tried with pydebug and without pydebug.

Oops, my last message (msg103435) was for #8434, not this issue. Anyway, #8434 is a duplicate of #8279, it doesn't matter.