Issue #3965: Allow repeated calls to turtle.Screen, by making it a
true singleton object.
Reviewed by Gregor Lingl.
diff --git a/Doc/library/turtle.rst b/Doc/library/turtle.rst
index 67064d1..5f9bf18 100644
--- a/Doc/library/turtle.rst
+++ b/Doc/library/turtle.rst
@@ -40,10 +40,10 @@
:class:`ScrolledCanvas` as argument. It should be used when :mod:`turtle` is
used as part of some application.
- Derived from :class:`TurtleScreen` is the subclass :class:`Screen`. Screen
- is implemented as sort of singleton, so there can exist only one instance of
- Screen at a time. It should be used when :mod:`turtle` is used as a
- standalone tool for doing graphics.
+ The function :func:`Screen` returns a singleton object of a
+ :class:`TurtleScreen` subclass. This function should be used when
+ :mod:`turtle` is used as a standalone tool for doing graphics.
+ As a singleton object, inheriting from its class is not possible.
All methods of TurtleScreen/Screen also exist as functions, i.e. as part of
the procedure-oriented interface.