Fixed full Tcl version parsing in tests for pre-final versions.

Lib/test/test_tcl.py

 import unittest
+import re
 import sys
 import os
 from test import support
@@ -17,27 +18,22 @@ try:
 except ImportError:
     INT_MAX = PY_SSIZE_T_MAX = sys.maxsize
 
-tcl_version = _tkinter.TCL_VERSION.split('.')
-try:
-    for i in range(len(tcl_version)):
-        tcl_version[i] = int(tcl_version[i])
-except ValueError:
-    pass
-tcl_version = tuple(tcl_version)
+tcl_version = tuple(map(int, _tkinter.TCL_VERSION.split('.')))
 
 _tk_patchlevel = None
 def get_tk_patchlevel():
     global _tk_patchlevel
     if _tk_patchlevel is None:
         tcl = Tcl()
-        patchlevel = []
-        for x in tcl.call('info', 'patchlevel').split('.'):
-            try:
-                x = int(x, 10)
-            except ValueError:
-                x = -1
-            patchlevel.append(x)
-        _tk_patchlevel = tuple(patchlevel)
+        patchlevel = tcl.call('info', 'patchlevel')
+        m = re.fullmatch(r'(\d+)\.(\d+)([ab.])(\d+)', patchlevel)
+        major, minor, releaselevel, serial = m.groups()
+        major, minor, serial = int(major), int(minor), int(serial)
+        releaselevel = {'a': 'alpha', 'b': 'beta', '.': 'final'}[releaselevel]
+        if releaselevel == 'final':
+            _tk_patchlevel = major, minor, serial, releaselevel, 0
+        else:
+            _tk_patchlevel = major, minor, 0, releaselevel, serial
     return _tk_patchlevel
 
 

Lib/tkinter/test/support.py

-import sys
+import re
 import tkinter
 import unittest
-from test.support import requires
 
 class AbstractTkTest:
 
@@ -63,14 +62,15 @@ def get_tk_patchlevel():
     global _tk_patchlevel
     if _tk_patchlevel is None:
         tcl = tkinter.Tcl()
-        patchlevel = []
-        for x in tcl.call('info', 'patchlevel').split('.'):
-            try:
-                x = int(x, 10)
-            except ValueError:
-                x = -1
-            patchlevel.append(x)
-        _tk_patchlevel = tuple(patchlevel)
+        patchlevel = tcl.call('info', 'patchlevel')
+        m = re.fullmatch(r'(\d+)\.(\d+)([ab.])(\d+)', patchlevel)
+        major, minor, releaselevel, serial = m.groups()
+        major, minor, serial = int(major), int(minor), int(serial)
+        releaselevel = {'a': 'alpha', 'b': 'beta', '.': 'final'}[releaselevel]
+        if releaselevel == 'final':
+            _tk_patchlevel = major, minor, serial, releaselevel, 0
+        else:
+            _tk_patchlevel = major, minor, 0, releaselevel, serial
     return _tk_patchlevel
 
 units = {

Lib/tkinter/test/test_ttk/test_widgets.py

@@ -20,7 +20,7 @@ class StandardTtkOptionsTests(StandardOptionsTests):
         widget = self.create()
         self.assertEqual(widget['class'], '')
         errmsg='attempt to change read-only option'
-        if get_tk_patchlevel() < (8, 6, 0): # actually this was changed in 8.6b3
+        if get_tk_patchlevel() < (8, 6, 0, 'beta', 3):
             errmsg='Attempt to change read-only option'
         self.checkInvalidParam(widget, 'class', 'Foo', errmsg=errmsg)
         widget2 = self.create(class_='Foo')
@@ -551,7 +551,7 @@ class PanedWindowTest(AbstractWidgetTest, unittest.TestCase):
         widget = self.create()
         self.assertEqual(str(widget['orient']), 'vertical')
         errmsg='attempt to change read-only option'
-        if get_tk_patchlevel() < (8, 6, 0): # actually this was changed in 8.6b3
+        if get_tk_patchlevel() < (8, 6, 0, 'beta', 3):
             errmsg='Attempt to change read-only option'
         self.checkInvalidParam(widget, 'orient', 'horizontal',
                 errmsg=errmsg)