Python QuantLib==1.3.4 issues DeprecationWarning on import

[cdcadman]

Here is a demonstration in the interactive shell, running python 3.12 with QuantLib version 1.34. When I use QuantLib version 1.33, these warnings are not issued:

C:\>python -Walways
Python 3.12.0 (tags/v3.12.0:0fb18b0, Oct  2 2023, 13:03:39) [MSC v.1935 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import QuantLib
<frozen importlib._bootstrap>:488: DeprecationWarning: builtin type SwigPyPacked has no __module__ attribute
<frozen importlib._bootstrap>:488: DeprecationWarning: builtin type SwigPyObject has no __module__ attribute
<frozen importlib._bootstrap>:488: DeprecationWarning: builtin type swigvarlink has no __module__ attribute
>>>

[boring-cyborg[bot]]

Thanks for posting! It might take a while before we look at your issue, so don't worry if there seems to be no feedback. We'll get to it.

[lballabio]

Thanks! This needs to be fixed in SWIG. It seems to be a known issue: https://github.com/swig/swig/issues/2881.

This only happens with the -Walways, right?

[cdcadman]

Yes, DeprecationWarning is ignored by python's default warning filter, so I used the -Walways to make it print out. I first noticed the warnings in pytest logs for some code that uses QuantLib.

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