Bump default Python to 3.12 and use 3.9 instead of 3.8 (#242)

See astral-sh/uv#13676

Author: zanieb

scenarios/requires_python/python-greater-than-current-patch.toml

@@ -8,7 +8,7 @@ requires = ["a==1.0.0"]
 satisfiable = false
 
 [packages.a.versions."1.0.0"]
-requires_python = ">=3.8.14"
+requires_python = ">=3.9.14"
 
 [environment]
-python = "3.8.12"
+python = "3.9.12"

scenarios/requires_python/python-patch-override-no-patch.toml

@@ -6,13 +6,13 @@ requires = ["a==1.0.0"]
 
 [expected]
 satisfiable = false
-explanation = "Since the resolver is asked to solve with 3.8, the minimum compatible Python requirement is treated as 3.8.0."
+explanation = "Since the resolver is asked to solve with 3.9, the minimum compatible Python requirement is treated as 3.9.0."
 
 [packages.a.versions."1.0.0"]
-requires_python = ">=3.8.4"
+requires_python = ">=3.9.4"
 
 [resolver_options]
-python = "3.8"
+python = "3.9"
 
 [environment]
-python = "3.8.20"
+python = "3.9.20"

scenarios/requires_python/python-patch-override-patch-compatible.toml

@@ -11,10 +11,10 @@ satisfiable = true
 a = "1.0.0"
 
 [packages.a.versions."1.0.0"]
-requires_python = ">=3.8.0"
+requires_python = ">=3.9.0"
 
 [resolver_options]
-python = "3.8.0"
+python = "3.9.0"
 
 [environment]
-python = "3.8.20"
+python = "3.9.20"

src/packse/scenario.py

@@ -166,7 +166,7 @@ def hash(self) -> str:
 
 
 class EnvironmentMetadata(msgspec.Struct, forbid_unknown_fields=True):
-    python: str = "3.8"
+    python: str = "3.12"
     """
     The active Python version.
     """