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Ah yes, correct: when a generator using "yield from obj" is destroyed while yield from is not done, obj.close() is called if the method exists.
So "yield from file" *is* different than "for line in file: yield file" when we don't consume the whole generator.
A workaround is to create a wrapper class and returns it in the _TemporaryFileWrapper.__iter__() method:
---
class Iterator:
 def __init__(self, obj):
 self.obj = obj
 def __next__(self):
 if self.obj is None:
 raise StopIteration
 return next(self.obj)
 def __iter__(self):
 return self
 def close(self):
 self.obj = None
---
Or simply:
---
class Iterator:
 def __init__(self, obj):
 self.obj = obj
 def __next__(self):
 return next(self.obj)
 def __iter__(self):
 return self
---
This solution looks more complex than tempfile_iter_fix.patch.
@Serhiy: Maybe add a short comment to explain why yield from is not used and must be used. (By the way, the current comment contains "yields from" which is confusing :-))