Bump Python version requirement

.github/workflows/build.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.7", "3.8", "3.9"]
+        python-version: ["3.8", "3.9"]
 
     steps:
       - uses: actions/checkout@v2

jaxfg/core/_factor_base.py

@@ -1,11 +1,10 @@
 import abc
-from typing import Generic, Tuple, Type, TypeVar, cast, get_type_hints
+from typing import Generic, Tuple, Type, TypeVar, cast, get_args, get_type_hints
 
 import jax
 import jax_dataclasses as jdc
 from jax import numpy as jnp
 from overrides import EnforceOverrides, final
-from typing_utils import get_args, issubtype
 
 from .. import hints, noises
 from ._variable_assignments import VariableAssignments
@@ -136,7 +135,7 @@ def build_variable_value_tuple(
             ) from e
 
         # Function should be hinted with a tuple of some kind, but not `tuple` itself
-        assert issubtype(value_type, tuple), value_type is not tuple
+        assert issubclass(value_type, tuple), value_type is not tuple
 
         # Heuristic: evaluates to `True` for NamedTuple types but `False` for
         # `Tuple[...]` types. Note that standard superclass checking approaches don't

setup.py

@@ -10,7 +10,7 @@
     license="BSD",
     packages=find_packages(),
     package_data={"jaxfg": ["py.typed"]},
-    python_requires=">=3.7",
+    python_requires=">=3.8",
     install_requires=[
         "tyro",
         "frozendict",
@@ -22,7 +22,6 @@
         "scikit-sparse",
         "termcolor",
         "tqdm",
-        "typing_utils",  # We can phase this out if we drop support for Python 3.7
         "matplotlib",
     ],
     extras_require={