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Suppose code:
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import os
import tempfile
want_to_replace = 'zxc.dat'
tmpdir=os.path.dirname(os.path.realpath(want_to_replace))
with tempfile.NamedTemporaryFile(dir=tmpdir) as fff:
 # do somewhat with fff here... and then:
 fff.flush()
 os.fdatasync(fff)
 os.rename(fff.name, want_to_replace)
 fff.delete = False
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In python 3.3 and lower that works FINE. In Python 3.4 the fff._closer attribute was introduced, so fff.close=False stopped to work. I think this is major loss of functionality. The "close" attribute was not marked as private, so may be used in past.