python-3.6.zip added from Github

README.cosmo contains the necessary links.

third_party/python/Lib/test/test_eintr.py

@@ -0,0 +1,37 @@
+import os
+import signal
+import subprocess
+import sys
+import unittest
+
+from test import support
+from test.support import script_helper
+
+
+@unittest.skipUnless(os.name == "posix", "only supported on Unix")
+class EINTRTests(unittest.TestCase):
+
+    @unittest.skipUnless(hasattr(signal, "setitimer"), "requires setitimer()")
+    def test_all(self):
+        # Run the tester in a sub-process, to make sure there is only one
+        # thread (for reliable signal delivery).
+        tester = support.findfile("eintr_tester.py", subdir="eintrdata")
+        # use -u to try to get the full output if the test hangs or crash
+        args = ["-u", tester, "-v"]
+        if support.verbose:
+            print()
+            print("--- run eintr_tester.py ---", flush=True)
+            # In verbose mode, the child process inherit stdout and stdout,
+            # to see output in realtime and reduce the risk of loosing output.
+            args = [sys.executable, "-E", "-X", "faulthandler", *args]
+            proc = subprocess.run(args)
+            print(f"--- eintr_tester.py completed: "
+                  f"exit code {proc.returncode} ---", flush=True)
+            if proc.returncode:
+                self.fail("eintr_tester.py failed")
+        else:
+            script_helper.assert_python_ok("-u", tester, "-v")
+
+
+if __name__ == "__main__":
+    unittest.main()