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Title: SpooledTemporaryFile.__iter__ is not transparent to rollover
Type: behavior Stage:
Components: Library (Lib) Versions: Python 3.10
Status: open Resolution:
Dependencies: Superseder:
Assigned To: Nosy List:
Priority: normal Keywords:

Created on 2021-01-08 14:46 by, last changed 2022-04-11 14:59 by admin.

Messages (1)
msg384674 - (view) Author: Jinoh Kang ( Date: 2021-01-08 14:46
In tempfile, SpooledTemporaryFile.__iter__ is defined as follows:

    # file protocol
    def __iter__(self):
        return self._file.__iter__()

A rollover would switch the underlying _file object from a BytesIO to a TemporaryFile, thereby leaving the original iterator stale.

This may be fixed by:

    def __iter__(self):
        while True:
            line = self._file.readline()
            if not line:
            yield line

Or perhaps:

    def __iter__(self):
        while True:
            file = self._file
            for line in file:
                yield line
                if file is not self._file:
Date User Action Args
2022-04-11 14:59:40adminsetgithub: 87034
2021-01-08 14:46:35jinoh.kang.krcreate