New submission from Dutcho <dut...@ziggo.nl>:
I'd expect isinstance(tempfile.TemporaryFile(), io.IOBase) to be True as you can read() from and write() to the temp file. However, on Python 3.6.5 64 bit on Windows 7 above isinstance() == False and and type(tempfile.TemporaryFile()) == tempfile._TemporaryFileWrapper, which has no super class (other than object). Whereas, on Python 3.6.1 on iOS 11.4 (Pythonista 3.2) above isinstance() == True and type(tempfile.TemporaryFile()) == io.BufferedRandom, which has io.IOBase as its (indirect) super class. The difference is likely caused by tempfile line 565 that equals TemporaryFile = NamedTemporaryFile in case of Windows. This may be somewhat related to issue 26175, but isn't a duplicate as 26175 is on a temp file's attributes, and this issue is on its type ---------- components: Library (Lib) messages: 318585 nosy: Dutcho priority: normal severity: normal status: open title: temp file isn't IOBase type: behavior versions: Python 3.6 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue33762> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
