python · vstinner · Mar 10, 2022 · Mar 10, 2022
diff --git a/Doc/library/math.rst b/Doc/library/math.rst
@@ -649,6 +649,9 @@ Constants
   A floating-point "not a number" (NaN) value.  Equivalent to the output of
   ``float('nan')``.

+   .. versionchanged:: 3.11
+      It is now always available.
+
   .. versionadded:: 3.5



@@ -254,6 +254,7 @@ inspect

 math
 ----
+
 * Add :func:`math.exp2`: return 2 raised to the power of x.
  (Contributed by Gideon Mitchell in :issue:`45917`.)

@@ -266,6 +267,9 @@ math
  ``inf``. Previously they raised :exc:`ValueError`. (Contributed by Mark
  Dickinson in :issue:`44339`.)

+* The :data:`math.nan` value is now always available.
+  (Contributed by Victor Stinner in :issue:`46917`.)
+

 operator
 --------

diff --git a/Misc/NEWS.d/next/Library/2022-03-10-14-47-16.bpo-46917.s19zcy.rst b/Misc/NEWS.d/next/Library/2022-03-10-14-47-16.bpo-46917.s19zcy.rst
@@ -0,0 +1 @@
+The :data:`math.nan` value is now always available. Patch by Victor Stinner.
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1 @@
		The :data:`math.nan` value is now always available. Patch by Victor Stinner.