Issue #4258: Use 30-bit digits for Python longs, on 64-bit platforms.
Backport of r70459.
diff --git a/Doc/library/sys.rst b/Doc/library/sys.rst
index 9d33c60..813e788 100644
--- a/Doc/library/sys.rst
+++ b/Doc/library/sys.rst
@@ -498,6 +498,25 @@
.. versionadded:: 1.5.2
+.. data:: long_info
+
+ A struct sequence that holds information about Python's
+ internal representation of integers. The attributes are read only.
+
+ +-------------------------+----------------------------------------------+
+ | attribute | explanation |
+ +=========================+==============================================+
+ | :const:`bits_per_digit` | number of bits held in each digit. Python |
+ | | integers are stored internally in base |
+ | | ``2**long_info.bits_per_digit`` |
+ +-------------------------+----------------------------------------------+
+ | :const:`sizeof_digit` | size in bytes of the C type used to |
+ | | represent a digit |
+ +-------------------------+----------------------------------------------+
+
+ .. versionadded:: 2.7
+
+
.. data:: last_type
last_value
last_traceback