[tasks] add download link to update python (#31831)

tasks/libs/common/utils.py

@@ -661,3 +661,15 @@ def agent_working_directory():
     from tasks.libs.common.worktree import LOCAL_DIRECTORY, WORKTREE_DIRECTORY, is_worktree
 
     return WORKTREE_DIRECTORY if is_worktree() else LOCAL_DIRECTORY
+
+
+def is_macos():
+    return sys.platform == 'darwin'
+
+
+def is_linux():
+    return sys.platform.startswith('linux')
+
+
+def is_windows():
+    return sys.platform == 'win32'

tasks/setup.py

@@ -19,7 +19,7 @@
 from tasks.libs.common.color import Color, color_message
 from tasks.libs.common.git import get_default_branch
 from tasks.libs.common.status import Status
-from tasks.libs.common.utils import running_in_pyapp
+from tasks.libs.common.utils import is_linux, is_windows, running_in_pyapp
 
 if TYPE_CHECKING:
     from collections.abc import Generator
@@ -145,10 +145,15 @@ def check_python_version(_ctx) -> SetupResult:
     status = Status.OK
     if tuple(sys.version_info)[:2] != tuple(int(d) for d in expected_version.split(".")):
         status = Status.FAIL
-        message = (
-            f"Python version is {sys.version_info[0]}.{sys.version_info[1]}.{sys.version_info[2]}. "
-            "Please update your environment: https://datadoghq.dev/datadog-agent/setup/#python-dependencies"
-        )
+        install_message = f"Please install Python {expected_version} with 'brew install python@{expected_version}'"
+        if is_windows():
+            install_message = f"Please install Python {expected_version} from https://www.python.org/downloads/windows/"
+        elif is_linux():
+            install_message = (
+                f"Please install Python {expected_version} with 'sudo apt-get install python{expected_version}-dev'"
+            )
+
+        message = f"Python version out of date, current is {sys.version_info[0]}.{sys.version_info[1]} while expected is {expected_version}.\n{install_message}"
 
     return SetupResult("Check Python version", status, message)