@@ -1040,20 +1040,6 @@ def processor():
     r'(?:,\s*([\w :]*))?)?\)\s*'  # ", buildtime)<space>"
     r'\[([^\]]+)\]?', re.ASCII)  # "[compiler]"
 
-_ironpython_sys_version_parser = re.compile(
-    r'IronPython\s*'
-    r'([\d\.]+)'
-    r'(?: \(([\d\.]+)\))?'
-    r' on (.NET [\d\.]+)', re.ASCII)
-
-# IronPython covering 2.6 and 2.7
-_ironpython26_sys_version_parser = re.compile(
-    r'([\d.]+)\s*'
-    r'\(IronPython\s*'
-    r'[\d.]+\s*'
-    r'\(([\d.]+)\) on ([\w.]+ [\d.]+(?: \(\d+-bit\))?)\)'
-)
-
 _pypy_sys_version_parser = re.compile(
     r'([\w.+]+)\s*'
     r'\(#?([^,]+),\s*([\w ]+),\s*([\w :]+)\)\s*'
@@ -1090,25 +1076,7 @@ def _sys_version(sys_version=None):
     if result is not None:
         return result
 
-    # Parse it
-    if 'IronPython' in sys_version:
-        # IronPython
-        name = 'IronPython'
-        if sys_version.startswith('IronPython'):
-            match = _ironpython_sys_version_parser.match(sys_version)
-        else:
-            match = _ironpython26_sys_version_parser.match(sys_version)
-
-        if match is None:
-            raise ValueError(
-                'failed to parse IronPython sys.version: %s' %
-                repr(sys_version))
-
-        version, alt_version, compiler = match.groups()
-        buildno = ''
-        builddate = ''
-
-    elif sys.platform.startswith('java'):
+    if sys.platform.startswith('java'):
         # Jython
         name = 'Jython'
         match = _sys_version_parser.match(sys_version)
@@ -1171,7 +1139,6 @@ def python_implementation():
 
         Currently, the following implementations are identified:
           'CPython' (C implementation of Python),
-          'IronPython' (.NET implementation of Python),
           'Jython' (Java implementation of Python),
           'PyPy' (Python implementation of Python).
 
 
@@ -123,10 +123,6 @@ def test_sys_version(self):
         for input, output in (
             ('2.4.3 (#1, Jun 21 2006, 13:54:21) \n[GCC 3.3.4 (pre 3.3.5 20040809)]',
              ('CPython', '2.4.3', '', '', '1', 'Jun 21 2006 13:54:21', 'GCC 3.3.4 (pre 3.3.5 20040809)')),
-            ('IronPython 1.0.60816 on .NET 2.0.50727.42',
-             ('IronPython', '1.0.60816', '', '', '', '', '.NET 2.0.50727.42')),
-            ('IronPython 1.0 (1.0.61005.1977) on .NET 2.0.50727.42',
-             ('IronPython', '1.0.0', '', '', '', '', '.NET 2.0.50727.42')),
             ('2.4.3 (truncation, date, t) \n[GCC]',
              ('CPython', '2.4.3', '', '', 'truncation', 'date t', 'GCC')),
             ('2.4.3 (truncation, date, ) \n[GCC]',
@@ -161,20 +157,11 @@ def test_sys_version(self):
                  ('r261:67515', 'Dec  6 2008 15:26:00'),
                  'GCC 4.0.1 (Apple Computer, Inc. build 5370)'),
 
-            ("IronPython 2.0 (2.0.0.0) on .NET 2.0.50727.3053", None, "cli")
+            ("3.10.8 (tags/v3.10.8:aaaf517424, Feb 14 2023, 16:28:12) [GCC 9.4.0]",
+             None, "linux")
             :
-                ("IronPython", "2.0.0", "", "", ("", ""),
-                 ".NET 2.0.50727.3053"),
-
-            ("2.6.1 (IronPython 2.6.1 (2.6.10920.0) on .NET 2.0.50727.1433)", None, "cli")
-            :
-                ("IronPython", "2.6.1", "", "", ("", ""),
-                 ".NET 2.0.50727.1433"),
-
-            ("2.7.4 (IronPython 2.7.4 (2.7.0.40) on Mono 4.0.30319.1 (32-bit))", None, "cli")
-            :
-                ("IronPython", "2.7.4", "", "", ("", ""),
-                 "Mono 4.0.30319.1 (32-bit)"),
+                ('CPython', '3.10.8', '', '',
+                ('tags/v3.10.8:aaaf517424', 'Feb 14 2023 16:28:12'), 'GCC 9.4.0'),
 
             ("2.5 (trunk:6107, Mar 26 2009, 13:02:18) \n[Java HotSpot(TM) Client VM (\"Apple Computer, Inc.\")]",
             ('Jython', 'trunk', '6107'), "java1.5.0_16")
@@ -205,6 +192,9 @@ def test_sys_version(self):
             self.assertEqual(platform.python_build(), info[4])
             self.assertEqual(platform.python_compiler(), info[5])
 
+        with self.assertRaises(ValueError):
+            platform._sys_version('2. 4.3 (truncation) \n[GCC]')
+
     def test_system_alias(self):
         res = platform.system_alias(
             platform.system(),
 
@@ -0,0 +1,2 @@
+Improve import time of ``platform`` by removing IronPython version parsing. The IronPython version parsing
+was not functional (see https://github.com/IronLanguages/ironpython3/issues/1667).
Original file line number	Diff line number	Diff line change
@@ -0,0 +1,2 @@
	1	+ Improve import time of ``platform`` by removing IronPython version parsing. The IronPython version parsing
	2	+ was not functional (see https://github.com/IronLanguages/ironpython3/issues/1667).