TypeError: cannot inherit frozen dataclass from a non-frozen one (during import of pyam)

[lucyhager]

Hi guys,

I encountered a TypeError when trying to import pyam in my environment this morning. My installation code looks like this:
!pip install ixmp4 numpy==1.23.5
!pip install pyam-iamc numpy==1.23.5
!pip install dask_expr numpy==1.23.5
import ixmp4
import pyam

Here’s the error trace:
TypeError: cannot inherit frozen dataclass from a non-frozen one

The error appears to occur within the Python dataclasses module, specifically:
TypeError: cannot inherit frozen dataclass from a non-frozen one

Any guidance on resolving this or insight into potential version incompatibilities would be much appreciated.

Thank you!

...

TypeError Traceback (most recent call last)
in <cell line: 5>()
3 get_ipython().system('pip install dask_expr numpy==1.23.5')
4 import ixmp4
----> 5 import pyam

10 frames
/usr/lib/python3.10/dataclasses.py in _process_class(cls, init, repr, eq, order, unsafe_hash, frozen, match_args, kw_only, slots)
988 # Raise an exception if we're frozen, but none of our bases are.
989 if not any_frozen_base and frozen:
--> 990 raise TypeError('cannot inherit frozen dataclass from a '
991 'non-frozen one')
992

TypeError: cannot inherit frozen dataclass from a non-frozen one

[danielhuppmann]

I also just encountered this issue today, it seems to be related to hgrecco/pint#1969 (even though it's not any more only affecting Python 3.13 as of today, see the latest comments there).

For me, simply installing pint from GitHub using

pip install git+https://github.com/hgrecco/pint.git

worked as a quickfix. Hoping that a new pint version will be released asap.

[lucyhager]

Great, that seemed to do the trick, thanks @danielhuppmann !