31         with self.open(TESTFN, mode) as f:
47         with cls.open(TESTFN, 'wb'):
65         with self.open(TESTFN, "rb") as f:
73         with self.open(TESTFN, 'rb') as f:
104         with self.open(TESTFN, 'rb') as f:
117         with self.open(TESTFN, 'r+b') as f:
151             with self.open(TESTFN, 'rb') as f:
169     open = staticmethod(io.open)  variable in TestCopyfile
180         with open(TESTFN2, 'rb') as f:
188     open = staticmethod(io.open)  variable in TestSocketSendfile
206                 with conn, open(TESTFN2, 'wb') as f:
228                 with open(TESTFN, 'rb') as f:
234         with open(TESTFN2, 'rb') as f:
261         f = open(TESTFN, 'wb', buffering=0)
277     open = staticmethod(io.open)  variable in CLargeFileTest
281     open = staticmethod(pyio.open)  variable in PyLargeFileTest