Meador Inge added the comment:
'tempfile.NamedTemporaryFile' returns an instance of '_TemporaryFileWrapper'
that wraps the created file object. The wrapper object implements
'__getattr__' and we end up with a situation like the following simplified
example where the wrapper gets destroyed before the looked up method is called:
$ cat test.py
class S(object):
def __init__(self):
print("S.__init__") def __del__(self): print("S.__del__")
def foo(self):
print("S.foo")
class T(object):
def __init__(self, s):
self.s = s
print("T.__init__")
def __getattr__(self, name):
s = self.__dict__['s']
a = getattr(s, name)
print("__getattr__('%s')" % name)
if not isinstance(a, int):
setattr(self, name, a)
return a
def __del__(self):
print("T.__del__")
T(S()).foo()
$ ./python test.py
S.__init__
T.__init__
__getattr__('foo')
T.__del__
S.foo
S.__del__
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<http://bugs.python.org/issue18879>
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