Create frozenset SUPPORTED_BACKENDS to avoid repetition

src/transonic/analyses/__init__.py

@@ -37,6 +37,7 @@
 from .parser import parse_transonic_def_commands
 from .objects_from_str import replace_strings_by_objects
 from . import extast
+from ..config import SUPPORTED_BACKENDS
 
 
 __all__ = ["print_dumped", "print_unparsed"]
@@ -88,7 +89,7 @@ def get_decorated_dicts(
 
     kinds = ("functions", "functions_ext", "methods", "classes")
 
-    backend_names = ("__all__", "pythran", "cython", "numba", "python")
+    backend_names = ("__all__", *SUPPORTED_BACKENDS)
     decorated_dicts = {
         kind: {name: {} for name in backend_names} for kind in kinds
     }

src/transonic/config.py

@@ -47,7 +47,7 @@
 from warnings import warn
 
 path_root = Path(os.environ.get("TRANSONIC_DIR", Path.home() / ".transonic"))
-
+SUPPORTED_BACKENDS = frozenset(("pythran", "cython", "jax", "numba", "python"))
 
 def strtobool(value):
     """Convert a string representation of truth to true (1) or false (0).
@@ -75,8 +75,7 @@ def set_backend(backend: str):
     """Set the "global variable" backend_default"""
 
     backend = backend.lower()
-    supported_backends = {"pythran", "cython", "jax", "numba", "python"}
-    if backend not in supported_backends:
+    if backend not in SUPPORTED_BACKENDS:
         raise ValueError(f"backend {backend} not supported")
 
     global backend_default, backend_set_by_user