ValueError: I/O operation on closed file · Issue #139 · grantjenks/python-diskcache https://github.com/grantjenks/python-diskcache/issues/139
"I have not had a chance to run it myself but it looks like it errors on pickle. Pickle is Python’s built-in serialization library. DiskCache isn’t doing any IO on the line that throws the exception. So my guess is that the data returned by feedparser has a file handle reference (perhaps through lxml). File handles cannot be serialized, therefore it errors."
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