Thank you, I'll consider myself having been warned :)

On Sat, Mar 24, 2018, 7:28 AM Christian Heimes <report@bugs.python.org>
wrote:

>
> Christian Heimes <lists@cheimes.de> added the comment:
>
> Serhiy,
> I don't understand what you are trying to tell me. "cannot serialize '%s'
> object" is used all over the interpreter, e.g. io, pickle, etree, and more.
> I feel it's the standard message.
>
> Vitaly,
> A lot of objects can't be copied. It's the general case for all kinds of
> objects that hold operating system resources (files, sockets) or wrap
> external C libraries (bz2, lzma, sqlite, ssl). We generally don't document
> that an object cannot be pickled, serialized, or copied. If documentation
> doesn't state that an object is copy-able or doesn't provide a dedicated
> copy method, than it can't be copied.
>
> ----------
>
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> <https://bugs.python.org/issue33023>
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