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And here the backtrace of the corresponding core (this is on
NetBSD/amd64 8.99.15 with lang/python36 package of today pkgsrc-current):
 % gdb -core python3.6.core `which python3.6`
 Reading symbols from /usr/pkg/bin/python3.6...done.
 [New process 1]
 Core was generated by `python3.6'.
 Program terminated with signal SIGABRT, Aborted.
 #0 0x000076255932924a in _lwp_kill () from /usr/lib/libc.so.12
 (gdb) bt
 #0 0x000076255932924a in _lwp_kill () from /usr/lib/libc.so.12
 #1 0x0000762559328e65 in abort () at /usr/src/lib/libc/stdlib/abort.c:74
 #2 0x000076255a749d33 in Py_FatalError (msg=msg@entry=0x76255a7dea20 "Py_Initialize: can't initialize sys standard streams")
 at Python/pylifecycle.c:1462
 #3 0x000076255a74af4c in _Py_InitializeEx_Private (install_sigs=1, install_importlib=1) at Python/pylifecycle.c:450
 #4 0x000076255a764902 in Py_Main (argc=argc@entry=3, argv=argv@entry=0x76255ab01060) at Modules/main.c:700
 #5 0x0000000000400e2f in main (argc=3, argv=<optimized out>) at ./Programs/python.c:69
 (gdb) f 4
 #4 0x000076255a764902 in Py_Main (argc=argc@entry=3, argv=argv@entry=0x76255ab01060) at Modules/main.c:700
 700 Py_Initialize();
 (gdb) f 3
 #3 0x000076255a74af4c in _Py_InitializeEx_Private (install_sigs=1, install_importlib=1) at Python/pylifecycle.c:450
 450 Py_FatalError(
 (gdb) list
 445 if (_PyTraceMalloc_Init() < 0)
 446 Py_FatalError("Py_Initialize: can't initialize tracemalloc");
 447
 448 initmain(interp); /* Module __main__ */
 449 if (initstdio() < 0)
 450 Py_FatalError(
 451 "Py_Initialize: can't initialize sys standard streams");
 452
 453 /* Initialize warnings. */
 454 if (PySys_HasWarnOptions()) {
Please let me know if any further information is needed and I will try
to help!
Thank you!