Issue #18879: When a method is looked up on a temporary file, avoid closing the file...

diff --cc Lib/tempfile.py
Simple merge

diff --cc Lib/test/test_tempfile.py
Simple merge

diff --cc Misc/NEWS
index e2592eb3df9635799e99c96ec317f875a3547993,61c4482490d10fd3673ca13543e2a8670b4efea0..0f209747a264775ab0064753a3b2acaf834830e2
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -44,23 -29,9 +44,26 @@@ Core and Builtin
  Library
  -------
  
+ - Issue #18879: When a method is looked up on a temporary file, avoid closing
+   the file before the method is possibly called.
+ 
 +- Issue #20037: Avoid crashes when opening a text file late at interpreter
 +  shutdown.
 +
 +- Issue #19967: Thanks to the PEP 442, asyncio.Future now uses a
 +  destructor to log uncaught exceptions, instead of the dedicated
 +  _TracebackLogger class.
 +
 +- Added a Task.current_task() class method to asyncio.
 +
 +- Issue #19850: Set SA_RESTART in asyncio when registering a signal
 +  handler to limit EINTR occurrences.
 +
 +- Implemented write flow control in asyncio for proactor event loop (Windows).
 +
 +- Change write buffer in asyncio use to avoid O(N**2) behavior.  Make
 +  write()/sendto() accept bytearray/memoryview.
 +
  - Issue #20034: Updated alias mapping to most recent locale.alias file
    from X.org distribution using makelocalealias.py.