Add typing for context managers returning Self

`Self` was introduced in python 3.11. Use `Self` from typing_extensions for previous Python versions

sphinxtools/utilities.py

@@ -32,6 +32,10 @@
 from .constants import RE_KEEP_SPACES, EXTERN_INHERITANCE
 from .constants import DOXYROOT, SPHINXROOT, WIDGETS_IMAGES_ROOT
 
+if sys.version_info >= (3, 11):
+    from typing import Self
+else:
+    from typing_extensions import Self
 
 # ----------------------------------------------------------------------- #
 
@@ -622,7 +626,7 @@ class PickleFile(object):
     def __init__(self, fileName):
         self.fileName = fileName
 
-    def __enter__(self):
+    def __enter__(self) -> Self:
         self.read()
         return self
 

wx/lib/busy.py

@@ -13,9 +13,15 @@
 and which has a nicer look.
 """
 
+import sys
 import wx
 from wx.lib.stattext import GenStaticText as StaticText
 
+if sys.version_info >= (3, 11):
+    from typing import Self
+else:
+    from typing_extensions import Self
+
 #---------------------------------------------------------------------------
 
 
@@ -68,7 +74,7 @@ def Close(self):
 
 
     # Magic methods for using this class as a Context Manager
-    def __enter__(self):
+    def __enter__(self) -> Self:
         return self
     def __exit__(self, exc_type, exc_val, exc_tb):
         self.Close()

wx/lib/plot/utils.py

@@ -13,6 +13,7 @@
 __docformat__ = "restructuredtext en"
 
 # Standard Library
+import sys
 import functools
 import inspect
 import itertools
@@ -22,6 +23,12 @@
 import wx
 import numpy as np
 
+if sys.version_info >= (3, 11):
+    from typing import Self
+else:
+    from typing_extensions import Self
+
+
 class PlotPendingDeprecation(wx.wxPyDeprecationWarning):
     pass
 
@@ -195,7 +202,7 @@ def wrapper(instance, dc, *args, **kwargs):
 
         return wrapper
 
-    def __enter__(self):
+    def __enter__(self) -> Self:
         self._save_items(self.dc)
         return self