Display the top 10 slowest tests.

Thanks to optparse, --slow syntax still works ;-)

rearrange methodcaller_new so that the main error case does not cause uninitialized memory usage (closes #27783)

Issue #27128, #18295: replace int type with Py_ssize_t for index variables used
for positional arguments. It should help to avoid integer overflow and help to
emit better machine code for "i++" (no trap needed for overflow).

Make also the total_args variable constant.

* Add comments
* Add empty lines for readability
* PEP 7 style for if block
* Remove useless assert(globals != NULL); (globals is tested a few lines
  before)

Merge dev_urandom_python() and dev_urandom_noraise() functions to reduce code
duplication.

Modify py_getrandom() to not call PyErr_CheckSignals() if raise is zero.
_PyRandom_Init() is called very early in the Python initialization, so it's
safer to not call PyErr_CheckSignals().

* Add pyurandom() helper function to factorize the code
* don't call Py_FatalError() in helper functions, but only in _PyRandom_Init()
  if pyurandom() failed, to uniformize the code

_is_data_descriptor().

_is_data_descriptor().

by increasing the number of iterations.  That appears sufficient to
expose the ref count problem fixed in this issue.
Patch suggested by Xiang Zhang