gh-109653: Improve import performance of tkinter library with lazy imports

Lib/tkinter/__init__.py

@@ -29,43 +29,55 @@
 button.pack(side=BOTTOM)
 tk.mainloop()
 """
+import _tkinter # If this fails your Python may not be configured for Tk
+from tkinter.constants import *
 
-import collections
-import enum
-import sys
-import types
+lazy import collections
+lazy import enum
+lazy import sys
+lazy import types
 
-import _tkinter # If this fails your Python may not be configured for Tk
 TclError = _tkinter.TclError
-from tkinter.constants import *
-import re
 
 wantobjects = 1
 _debug = False  # set to True to print executed Tcl/Tk commands
 
 TkVersion = float(_tkinter.TK_VERSION)
 TclVersion = float(_tkinter.TCL_VERSION)
 
+lazy import re
+
 READABLE = _tkinter.READABLE
 WRITABLE = _tkinter.WRITABLE
 EXCEPTION = _tkinter.EXCEPTION
 
+_magic_re = None
+_space_re = None
 
-_magic_re = re.compile(r'([\\{}])')
-_space_re = re.compile(r'([\s])', re.ASCII)
+def _get_magic_re():
+    """Internal function."""
+    global _magic_re
+    if _magic_re is None:
+        _magic_re = re.compile(r'([\\{}])')
+    return _magic_re
 
+def _get_space_re():
+    """Internal function."""
+    global _space_re
+    if _space_re is None:
+        _space_re = re.compile(r'([\s])', re.ASCII)
+    return _space_re
 
 def _join(value):
     """Internal function."""
     return ' '.join(map(_stringify, value))
 
-
 def _stringify(value):
     """Internal function."""
     if isinstance(value, (list, tuple)):
         if len(value) == 1:
             value = _stringify(value[0])
-            if _magic_re.search(value):
+            if _get_magic_re().search(value):
                 value = '{%s}' % value
         else:
             value = '{%s}' % _join(value)
@@ -76,14 +88,14 @@ def _stringify(value):
             value = str(value)
         if not value:
             value = '{}'
-        elif _magic_re.search(value):
+        elif _get_magic_re().search(value):
             # add '\' before special characters and spaces
-            value = _magic_re.sub(r'\\\1', value)
+            value = _get_magic_re().sub(r'\\\1', value)
             value = value.replace('\n', r'\n')
-            value = _space_re.sub(r'\\\1', value)
+            value = _get_space_re().sub(r'\\\1', value)
             if value[0] == '"':
                 value = '\\' + value
-        elif value[0] == '"' or _space_re.search(value):
+        elif value[0] == '"' or _get_space_re().search(value):
             value = '{%s}' % value
     return value
 

Misc/NEWS.d/next/Library/2026-04-11-18-49-40.gh-issue-109653.VXU-w8.rst

@@ -0,0 +1,2 @@
+Reduce the import time of :mod:`tkinter` with lazy imports. Patch by Rihaan
+Meher.