ImportError: cannot import name 'HAS_F_STRINGS' from 'attr._compat'

[RvV1979]

Hi,

When initializing feems, I am getting the following error:

>>> from feems.utils import prepare_graph_inputs
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/bin/mambaforge/envs/feems/lib/python3.8/site-packages/feems/__init__.py", line 6, in <module>
    from .sim import setup_graph, simulate_genotypes
  File "/usr/bin/mambaforge/envs/feems/lib/python3.8/site-packages/feems/sim.py", line 8, in <module>
    import msprime
  File "/usr/bin/mambaforge/envs/feems/lib/python3.8/site-packages/msprime/__init__.py", line 35, in <module>
    from msprime.ancestry import (
  File "/usr/bin/mambaforge/envs/feems/lib/python3.8/site-packages/msprime/ancestry.py", line 40, in <module>
    import tskit
  File "/usr/bin/mambaforge/envs/feems/lib/python3.8/site-packages/tskit/__init__.py", line 74, in <module>
    from tskit.provenance import __version__  # NOQA
  File "/usr/bin/mambaforge/envs/feems/lib/python3.8/site-packages/tskit/provenance.py", line 31, in <module>
    import jsonschema
  File "/usr/bin/mambaforge/envs/feems/lib/python3.8/site-packages/jsonschema/__init__.py", line 13, in <module>
    from jsonschema._format import FormatChecker
  File "/usr/bin/mambaforge/envs/feems/lib/python3.8/site-packages/jsonschema/_format.py", line 11, in <module>
    from jsonschema.exceptions import FormatError
  File "/usr/bin/mambaforge/envs/feems/lib/python3.8/site-packages/jsonschema/exceptions.py", line 12, in <module>
    import attr
  File "/usr/bin/mambaforge/envs/feems/lib/python3.8/site-packages/attr/__init__.py", line 10, in <module>
    from . import converters, exceptions, filters, setters, validators
  File "/usr/bin/mambaforge/envs/feems/lib/python3.8/site-packages/attr/converters.py", line 11, in <module>
    from ._make import NOTHING, Factory, pipe
  File "/usr/bin/mambaforge/envs/feems/lib/python3.8/site-packages/attr/_make.py", line 14, in <module>
    from ._compat import (
ImportError: cannot import name 'HAS_F_STRINGS' from 'attr._compat' (/usr/bin/mambaforge/envs/feems/lib/python3.8/site-packages/attr/_compat.py)

The same error occurs when calling from feems import SpatialGraph, Viz, Objective, query_node_attributes. The strange thing is that feems was running OK on my system before (perhaps a conda update is to blame?). I have tried re-installing the conda environment and feems but this did not help.

Any help or advice would be much appreciated. Thanks

[VivaswatS]

Hi @RvV1979, sorry for the delayed response! Wondering if you were able to solve this? I haven't seen this error before.
If not (based on a preliminary internet search), I would create a new conda environment and install FEEMS with a more recent version of python (say, 3.10).