Patch by Bar Harel.

Temporary hack for issue #25180: exclude test_fstring.py from the unparse round-tripping, while I figure out how to properly fix it.

Issue #24965: Implement PEP 498 "Literal String Interpolation". Documentation is still needed, I'll open an issue for that.

avoid undefined behaviour when LONG_MAX type is smaller than 60 bits.

This change should fix a warning with the ICC compiler.

for profile data.

Thanks to Alecsandru Patrascu of Intel for the initial patch.

Leopard because this OS uses out of date (pre 2011k) timezone files.

When os.urandom() is implemented with the getrandom() function, it doesn't use
a file descriptor.

function instead of the getentropy() function. The getentropy() function is
blocking to generate very good quality entropy, os.urandom() doesn't need such
high-quality entropy.

Python.h header to fix a compilation error with OpenMP. PyThreadState_GET()
becomes an alias to PyThreadState_Get() to avoid ABI incompatibilies.

It is important that the _PyThreadState_Current variable is always accessed
with the same implementation of pyatomic.h. Use the PyThreadState_Get()
function so extension modules will all reuse the same implementation.

Test self.theclass, not datetime. Regression introduced by manual tests.

of datetime.datetime: microseconds are now rounded to nearest with ties going
to nearest even integer (ROUND_HALF_EVEN), instead of being rounding towards
zero (ROUND_DOWN). It's important that these methods use the same rounding
mode than datetime.timedelta to keep the property:

   (datetime(1970,1,1) + timedelta(seconds=t)) == datetime.utcfromtimestamp(t)

It also the rounding mode used by round(float) for example.

Add more unit tests on the rounding mode in test_datetime.

_PyTime_Divide() rounding was wrong: copy code from Python default which has
now much better unit tests.

Oops, I forgot to document my change.

PyObject_Length() returns a P_ssize_t, not an int. Use a Py_ssize_t to avoid
overflow.