Revert "Upgrade to Python 3.10"

This reverts commit 2537833.

Python 3.9 is useful to keep for PyJobShop.

Author: leonlan

psplib/parse.py

@@ -1,4 +1,5 @@
 from pathlib import Path
+from typing import Union
 
 from .parse_mplib import parse_mplib
 from .parse_patterson import parse_patterson
@@ -8,7 +9,7 @@
 
 
 def parse(
-    loc: str | Path,
+    loc: Union[str, Path],
     instance_format: str = "psplib",
 ) -> ProjectInstance:
     """

psplib/parse_mplib.py

@@ -1,9 +1,10 @@
 from pathlib import Path
+from typing import Union
 
 from .ProjectInstance import Activity, Mode, Project, ProjectInstance, Resource
 
 
-def parse_mplib(loc: str | Path) -> ProjectInstance:
+def parse_mplib(loc: Union[str, Path]) -> ProjectInstance:
     """
     Parses a multi-project resource-constrained project scheduling problem
     instances from MPLIB.

psplib/parse_patterson.py

@@ -1,9 +1,10 @@
 from pathlib import Path
+from typing import Union
 
 from .ProjectInstance import Activity, Mode, Project, ProjectInstance, Resource
 
 
-def parse_patterson(loc: str | Path) -> ProjectInstance:
+def parse_patterson(loc: Union[str, Path]) -> ProjectInstance:
     """
     Parses a Patterson-formatted instance. This format is used for pure
     resource-constrained project scheduling problem (RCPSP) instances.

psplib/parse_psplib.py

@@ -1,5 +1,6 @@
 import re
 from pathlib import Path
+from typing import Union
 
 from .ProjectInstance import Activity, Mode, Project, ProjectInstance, Resource
 
@@ -12,7 +13,7 @@ def _find(lines: list[str], pattern: str) -> int:
     raise ValueError(f"Pattern '{pattern}' not found in lines.")
 
 
-def parse_psplib(loc: str | Path) -> ProjectInstance:
+def parse_psplib(loc: Union[str, Path]) -> ProjectInstance:
     """
     Parses an PSPLIB-formatted instance from a file.
 
@@ -41,7 +42,7 @@ def parse_psplib(loc: str | Path) -> ProjectInstance:
     ]
     resources = [
         Resource(capacity, is_renewable)
-        for capacity, is_renewable in zip(capacities, renewable, strict=False)
+        for capacity, is_renewable in zip(capacities, renewable)
     ]
     num_resources = len(resources)
 

psplib/parse_rcpsp_max.py

@@ -1,9 +1,10 @@
 from pathlib import Path
+from typing import Union
 
 from .ProjectInstance import Activity, Mode, Project, ProjectInstance, Resource
 
 
-def parse_rcpsp_max(loc: str | Path) -> ProjectInstance:
+def parse_rcpsp_max(loc: Union[str, Path]) -> ProjectInstance:
     """
     Parses the RCPSP/max instance format.
 

pyproject.toml

@@ -21,7 +21,7 @@ classifiers = [
     "License :: OSI Approved :: MIT License",
     "Programming Language :: Python :: 3",
 ]
-requires-python = ">=3.10"
+requires-python = ">=3.9"
 dependencies = []