GH-116380: Speed up glob.glob() by removing some system calls

Doc/library/glob.rst

@@ -75,10 +75,6 @@ The :mod:`glob` module defines the following functions:
       Using the "``**``" pattern in large directory trees may consume
       an inordinate amount of time.
 
-   .. note::
-      This function may return duplicate path names if *pathname*
-      contains multiple "``**``" patterns and *recursive* is true.
-
    .. versionchanged:: 3.5
       Support for recursive globs using "``**``".
 
@@ -88,6 +84,11 @@ The :mod:`glob` module defines the following functions:
    .. versionchanged:: 3.11
       Added the *include_hidden* parameter.
 
+   .. versionchanged:: 3.14
+      Matching path names are returned only once. In previous versions, this
+      function may return duplicate path names if *pathname* contains multiple
+      "``**``" patterns and *recursive* is true.
+
 
 .. function:: iglob(pathname, *, root_dir=None, dir_fd=None, recursive=False, \
                     include_hidden=False)
@@ -98,10 +99,6 @@ The :mod:`glob` module defines the following functions:
    .. audit-event:: glob.glob pathname,recursive glob.iglob
    .. audit-event:: glob.glob/2 pathname,recursive,root_dir,dir_fd glob.iglob
 
-   .. note::
-      This function may return duplicate path names if *pathname*
-      contains multiple "``**``" patterns and *recursive* is true.
-
    .. versionchanged:: 3.5
       Support for recursive globs using "``**``".
 
@@ -111,6 +108,11 @@ The :mod:`glob` module defines the following functions:
    .. versionchanged:: 3.11
       Added the *include_hidden* parameter.
 
+   .. versionchanged:: 3.14
+      Matching path names are yielded only once. In previous versions, this
+      function may yield duplicate path names if *pathname* contains multiple
+      "``**``" patterns and *recursive* is true.
+
 
 .. function:: escape(pathname)
 

Doc/whatsnew/3.14.rst

@@ -460,6 +460,15 @@ asyncio
   reduces memory usage.
   (Contributed by Kumar Aditya in :gh:`107803`.)
 
+
+glob
+----
+
+* Reduce the number of system calls in :func:`glob.glob` and :func:`~glob.iglob`,
+  thereby improving the speed of globbing operations by 20-80%.
+  (Contributed by Barney Gale in :gh:`116380`.)
+
+
 Deprecated
 ==========