[issue25571] Improve the lltrace feature with the Py_Debug mode

[STINNER Victor]

STINNER Victor added the comment:

It would be nice to have unit tests and docs :-)

For unit test, you can use a script like:
---
def func():
    return 1

__ltrace__ = True
func()
---

Run the script with test.support.assert_python_ok(), and check stdout.

To skip the test if Python is compiled in released mode, you can use:
---
# Were we compiled --with-pydebug or with #define Py_DEBUG?
Py_DEBUG = hasattr(sys, 'gettotalrefcount')

...
@unittest.skipUnless(Py_DEBUG, 'need Py_DEBUG')
---

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25571>
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