merge 3.5

diff --cc Misc/NEWS
index 15d09e72352a3ebfd1084adde4a7a6f0e4e9daaf,1de23b575fb0a698235daf1713af4a1929869ad4..59fc57a05de151c8735b2a018bcec859ba67cce9
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -69,41 -34,11 +69,41 @@@ Core and Builtin
  Library
  -------
  
 +- Issue #27736: Prevent segfault after interpreter re-initialization due
 +  to ref count problem introduced in code for Issue #27038 in 3.6.0a3.
 +  Patch by Xiang Zhang.
 +
 +- Issue #12345: Add mathemathical constant tau to math and cmath. See also
 +  PEP 628.
 +
 +- Issue #26823: traceback.StackSummary.format now abbreviates large sections of
 +  repeated lines as "[Previous line repeated {count} more times]" (this change
 +  then further affects other traceback display operations in the module). Patch
 +  by Emanuel Barry.
 +
 +- Issue #27664: Add to concurrent.futures.thread.ThreadPoolExecutor()
 +  the ability to specify a thread name prefix.
 +
 +- Issue #27181: Add geometric_mean and harmonic_mean to statistics module.
 +
 +- Issue #27573: code.interact now prints an message when exiting.
 +
 +- Issue #6422: Add autorange method to timeit.Timer objects.
 +
  - Issue #26750: unittest.mock.create_autospec() now works properly for
 -  subclasses of property() and other data descriptors.
 +  subclasses of property() and other data descriptors.  Removes the never
 +  publicly used, never documented unittest.mock.DescriptorTypes tuple.
 +
 +- Issue #26754: Undocumented support of general bytes-like objects
 +  as path in compile() and similar functions is now deprecated.
 +
 +- Issue #26800: Undocumented support of general bytes-like objects
 +  as paths in os functions is now deprecated.
 +
 +- Issue #27661: Added tzinfo keyword argument to datetime.combine.
  
- - In the curses module, raise an error if window.getstr() is passed a negative
-   value.
+ - In the curses module, raise an error if window.getstr() or window.instr() is
+   passed a negative value.
  
  - Issue #27760: Fix possible integer overflow in binascii.b2a_qp.