Use constant for downloading python standalone version. (#177)

* Create constant for downloading python standalone version.

* Ruff fix.

comfy_cli/constants.py

@@ -77,3 +77,6 @@ class GPU_OPTION(str, Enum):
 SUPPORTED_PT_EXTENSIONS = (".ckpt", ".pt", ".bin", ".pth", ".safetensors")
 
 NODE_ZIP_FILENAME = "node.zip"
+
+# The default version to download from python-build-standalone.
+DEFAULT_STANDALONE_PYTHON_DOWNLOAD_VERSION = "3.12.6"

comfy_cli/standalone.py

@@ -5,7 +5,7 @@
 
 import requests
 
-from comfy_cli.constants import OS, PROC
+from comfy_cli.constants import DEFAULT_STANDALONE_PYTHON_DOWNLOAD_VERSION, OS, PROC
 from comfy_cli.typing import PathLike
 from comfy_cli.utils import create_tarball, download_url, extract_tarball, get_os, get_proc
 from comfy_cli.uv import DependencyCompiler
@@ -28,7 +28,7 @@
 def download_standalone_python(
     platform: Optional[str] = None,
     proc: Optional[str] = None,
-    version: str = "3.12.5",
+    version: str = DEFAULT_STANDALONE_PYTHON_DOWNLOAD_VERSION,
     tag: str = "latest",
     flavor: str = "install_only",
     cwd: PathLike = ".",
@@ -65,7 +65,7 @@ class StandalonePython:
     def FromDistro(
         platform: Optional[str] = None,
         proc: Optional[str] = None,
-        version: str = "3.12.6",
+        version: str = DEFAULT_STANDALONE_PYTHON_DOWNLOAD_VERSION,
         tag: str = "latest",
         flavor: str = "install_only",
         cwd: PathLike = ".",