Remove outdated TkVersion checks.

Minimal supported Tcl/Tk version is 8.4, and this is checked in _tkinter.c.

Lib/tkinter/__init__.py

@@ -1887,9 +1887,6 @@ class Tk(Misc, Wm):
         if tcl_version != _tkinter.TCL_VERSION:
             raise RuntimeError("tcl.h version (%s) doesn't match libtcl.a version (%s)" \
                                % (_tkinter.TCL_VERSION, tcl_version))
-        if TkVersion < 4.0:
-            raise RuntimeError("Tk 4.0 or higher is required; found Tk %s"
-                               % str(TkVersion))
         # Create and register the tkerror and exit commands
         # We need to inline parts of _register here, _ register
         # would register differently-named commands.

Lib/tkinter/commondialog.py

@@ -15,11 +15,6 @@ class Dialog:
     command  = None
 
     def __init__(self, master=None, **options):
-
-        # FIXME: should this be placed on the module level instead?
-        if TkVersion < 4.2:
-            raise TclError("this module requires Tk 4.2 or newer")
-
         self.master  = master
         self.options = options
         if not master and options.get('parent'):

Lib/tkinter/dialog.py

@@ -3,10 +3,7 @@
 from tkinter import *
 from tkinter import _cnfmerge
 
-if TkVersion <= 3.6:
-    DIALOG_ICON = 'warning'
-else:
-    DIALOG_ICON = 'questhead'
+DIALOG_ICON = 'questhead'
 
 
 class Dialog(Widget):

Lib/tkinter/tix.py

@@ -29,10 +29,6 @@
 from tkinter import *
 from tkinter import _cnfmerge, _default_root
 
-# WARNING - TkVersion is a limited precision floating point number
-if TkVersion < 3.999:
-    raise ImportError("This version of Tix.py requires Tk 4.0 or higher")
-
 import _tkinter # If this fails your Python may not be configured for Tk
 
 # Some more constants (for consistency with Tkinter)