Add deprecation warning for color

Author: savannahostrowski

Lib/argparse.py

@@ -166,7 +166,18 @@ def __init__(
         indent_increment=2,
         max_help_position=24,
         width=None,
+        color=None,
     ):
+        # Handle deprecated 'color' parameter for backwards compatibility
+        if color is not None:
+            import warnings
+            warnings.warn(
+                "The 'color' parameter is deprecated. "
+                "Set 'color' in ArgumentParser instead.",
+                DeprecationWarning,
+                stacklevel=2,
+            )
+
         # default setting for width
         if width is None:
             import shutil

Lib/test/test_argparse.py

@@ -5702,6 +5702,12 @@ def test_direct_formatter_instantiation(self):
         help_text = formatter.format_help()
         self.assertEqual(help_text, "usage: program\n")
 
+    def test_formatter_color_parameter_deprecated(self):
+        with self.assertWarns(DeprecationWarning) as cm:
+            argparse.HelpFormatter(prog="program", color=True)
+        self.assertIn("'color' parameter is deprecated", str(cm.warning))
+        self.assertIn("ArgumentParser", str(cm.warning))
+
 # =====================================
 # Optional/Positional constructor tests
 # =====================================