Add eol python warnings

changes/1669.misc.rst

@@ -0,0 +1 @@
+Warnings regarding outdated Python versions will now be shown.

src/briefcase/commands/base.py

@@ -10,6 +10,7 @@
 import sys
 from abc import ABC, abstractmethod
 from argparse import RawDescriptionHelpFormatter
+from datetime import date
 from pathlib import Path
 from typing import Any
 
@@ -178,12 +179,12 @@ def __init__(
  self.data_path = self.validate_data_path(data_path)
  self.apps = {} if apps is None else apps
  self.is_clone = is_clone
-
  self.tools = tools or ToolCache(
  logger=logger,
  console=console,
  base_path=self.data_path / "tools",
  )
+ self.validate_python_version()
 
  # Immediately add tools that must be always available
  Subprocess.verify(tools=self.tools)
@@ -305,6 +306,20 @@ def validate_locale(self):
 """
  )
 
+ def validate_python_version(self):
+ """Validate the system's python version is not past its EOL date."""
+ python_version = sys.version_info
+ today = date.today()
+ EOL_year = today.year - 2024 # increment this each year past 10-2024
+ if today.month > 10:
+ EOL_year += 1
+ if python_version[0] < 3 or (
+ python_version[0] == 3 and python_version[1] < 8 + EOL_year
+ ):
+ self.logger.warning(
+ f"WARNING: Python version is past its EOL date. Update Python to at least Python 3.{EOL_year+8}."
+ )
+
  def _command_factory(self, command_name: str):
  """Command factory for the current platform and format.