Drop support for Python 3.8.

Author: jfng

.github/workflows/main.yaml

@@ -12,12 +12,11 @@ jobs:
     strategy:
       matrix:
         python-version:
-        - '3.8'
         - '3.9'
         - '3.10'
         - '3.11'
         - '3.12'
-        - 'pypy-3.8'
+        - '3.13'
         - 'pypy-3.9'
         - 'pypy-3.10'
         # this version range needs to be synchronized with the one in pyproject.toml

amaranth_soc/csr/bus.py

@@ -53,13 +53,6 @@ class Signature(wiring.Signature):
         def __init__(self, width, access):
             if not isinstance(width, int) or width < 0:
                 raise TypeError(f"Width must be a non-negative integer, not {width!r}")
-            # TODO(py3.9): Remove this. Python 3.8 and below use cls.__name__ in the error message
-            # instead of cls.__qualname__.
-            # Element.Access(access)
-            try:
-                Element.Access(access)
-            except ValueError as e:
-                raise ValueError(f"{access!r} is not a valid Element.Access") from e
 
             self._width  = width
             self._access = Element.Access(access)

amaranth_soc/csr/reg.py

@@ -56,13 +56,6 @@ class Signature(wiring.Signature):
         def __init__(self, shape, access):
             if not isinstance(shape, ShapeLike):
                 raise TypeError(f"Field shape must be a shape-like object, not {shape!r}")
-            # TODO(py3.9): Remove this. Python 3.8 and below use cls.__name__ in the error message
-            # instead of cls.__qualname__.
-            # FieldPort.Access(access)
-            try:
-                FieldPort.Access(access)
-            except ValueError as e:
-                raise ValueError(f"{access!r} is not a valid FieldPort.Access") from e
 
             self._shape  = Shape.cast(shape)
             self._access = FieldPort.Access(access)
@@ -461,13 +454,7 @@ class Register(wiring.Component):
 
     def __init_subclass__(cls, *, access=None, **kwargs):
         if access is not None:
-            # TODO(py3.9): Remove this. Python 3.8 and below use cls.__name__ in the error message
-            # instead of cls.__qualname__.
-            # cls._access = Element.Access(access)
-            try:
-                cls._access = Element.Access(access)
-            except ValueError as e:
-                raise ValueError(f"{access!r} is not a valid Element.Access") from e
+            cls._access = Element.Access(access)
             cls.__doc__ = cls._doc_template.format(parameters="")
         super().__init_subclass__(**kwargs)
 
@@ -493,11 +480,7 @@ def filter_fields(src):
                                  f"field annotations: {', '.join(annot_fields)}")
 
         if access is not None:
-            # TODO(py3.9): Remove this (see above).
-            try:
-                access = Element.Access(access)
-            except ValueError as e:
-                raise ValueError(f"{access!r} is not a valid Element.Access") from e
+            access = Element.Access(access)
             if hasattr(self, "_access") and access != self._access:
                 raise ValueError(f"Element access mode {access} conflicts with the value "
                                  f"provided during class creation: {self._access}")

amaranth_soc/event.py

@@ -29,14 +29,6 @@ class Signature(wiring.Signature):
             Event trigger. Asserted when an event occurs, according to the trigger mode.
         """
         def __init__(self, *, trigger="level"):
-            # TODO(py3.9): Remove this. Python 3.8 and below use cls.__name__ in the error message
-            # instead of cls.__qualname__.
-            # Source.Trigger(trigger)
-            try:
-                Source.Trigger(trigger)
-            except ValueError as e:
-                raise ValueError(f"{trigger!r} is not a valid Source.Trigger") from e
-
             super().__init__({
                 "i":   Out(1),
                 "trg": In(1),

pyproject.toml

@@ -11,7 +11,7 @@ description = "System on Chip toolkit for Amaranth HDL"
 authors = [{name = "Amaranth HDL contributors"}]
 license = {file = "LICENSE.txt"}
 
-requires-python = "~=3.8"
+requires-python = "~=3.9"
 dependencies = [
   # this version requirement needs to be synchronized with the one in .github/workflows/main.yml
   "amaranth>=0.5,<0.6",