fix: Restore support for Python 3.9 (#82)

.github/workflows/build-test.yaml

@@ -25,7 +25,7 @@ jobs:
           path: ${{ env.OUTPUT_DIR }}
   wheel:
     runs-on: ubuntu-latest
-    container: python:3
+    container: python:3.9
     steps:
       - uses: actions/checkout@v4
         with:

src/rapids_dependency_file_generator/_config.py

@@ -1,3 +1,4 @@
+import typing
 from dataclasses import dataclass, field
 from enum import Enum
 from os import PathLike
@@ -43,7 +44,7 @@ class FileExtras:
     table: str
     """The ``table`` field."""
 
-    key: str | None = None
+    key: typing.Union[str, None] = None
     """The ``key`` field."""
 
 
@@ -57,7 +58,7 @@ class File:
     includes: list[str]
     """The list of dependency sets to include."""
 
-    extras: FileExtras | None = None
+    extras: typing.Union[FileExtras, None] = None
     """Optional extra information for the file generator."""
 
     matrix: dict[str, list[str]] = field(default_factory=dict)
@@ -88,7 +89,7 @@ class CommonDependencies:
     output_types: set[Output]
     """The set of output types for this entry."""
 
-    packages: list[str | PipRequirements]
+    packages: list[typing.Union[str, PipRequirements]]
     """The list of packages for this entry."""
 
 
@@ -99,7 +100,7 @@ class MatrixMatcher:
     matrix: dict[str, str]
     """The set of matrix values to match."""
 
-    packages: list[str | PipRequirements]
+    packages: list[typing.Union[str, PipRequirements]]
     """The list of packages for this entry."""
 
 
@@ -142,7 +143,7 @@ class Config:
     """The dependency sets, keyed by name."""
 
 
-def _parse_outputs(outputs: str | list[str]) -> set[Output]:
+def _parse_outputs(outputs: typing.Union[str, list[str]]) -> set[Output]:
     if isinstance(outputs, str):
         outputs = [outputs]
     if outputs == ["none"]:
@@ -177,7 +178,7 @@ def get_extras():
     )
 
 
-def _parse_requirement(requirement: str | dict[str, str]) -> str | PipRequirements:
+def _parse_requirement(requirement: typing.Union[str, dict[str, str]]) -> typing.Union[str, PipRequirements]:
     if isinstance(requirement, str):
         return requirement
 

src/rapids_dependency_file_generator/_rapids_dependency_file_generator.py

@@ -2,6 +2,7 @@
 import itertools
 import os
 import textwrap
+import typing
 from collections import defaultdict
 from collections.abc import Generator
 
@@ -40,8 +41,8 @@ def delete_existing_files(root: os.PathLike) -> None:
 
 
 def dedupe(
-    dependencies: list[str | _config.PipRequirements],
-) -> list[str | dict[str, str]]:
+    dependencies: list[typing.Union[str, _config.PipRequirements]],
+) -> list[typing.Union[str, dict[str, str]]]:
     """Generate the unique set of dependencies contained in a dependency list.
 
     Parameters
@@ -96,7 +97,7 @@ def make_dependency_file(
     config_file: os.PathLike,
     output_dir: os.PathLike,
     conda_channels: list[str],
-    dependencies: list[str | dict[str, list[str]]],
+    dependencies: list[typing.Union[str, dict[str, list[str]]]],
     extras: _config.FileExtras,
 ):
     """Generate the contents of the dependency file.
@@ -314,8 +315,8 @@ def should_use_specific_entry(matrix_combo: dict[str, str], specific_entry_matri
 def make_dependency_files(
     parsed_config: _config.Config,
     file_keys: list[str],
-    output: set[_config.Output] | None,
-    matrix: dict[str, list[str]] | None,
+    output: typing.Union[set[_config.Output], None],
+    matrix: typing.Union[dict[str, list[str]], None],
     prepend_channels: list[str],
     to_stdout: bool,
 ):