From: Raymond Hettinger <python@rcn.com>
Date: Mon, 24 Jan 2011 09:17:24 +0000 (+0000)
Subject: Add entry for hash_info().
X-Git-Tag: v3.2rc2~67
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=e7dfe74ce39cad736da8e3a24fdc4cfb50c7c515;p=python

Add entry for hash_info().
---

diff --git a/Doc/whatsnew/3.2.rst b/Doc/whatsnew/3.2.rst
index d6872dcb1f..203c18d225 100644
--- a/Doc/whatsnew/3.2.rst
+++ b/Doc/whatsnew/3.2.rst
@@ -1106,6 +1106,14 @@ values are equal (:issue:`8188`)::
    assert hash(Fraction(3, 2)) == hash(1.5) == \
           hash(Decimal("1.5")) == hash(complex(1.5, 0))
 
+Some of the hashing details are exposed through a new attribute,
+:attr:`sys.hash_info`, which describes the bit width of the hash value, the
+prime modulus, the hash values for *infinity* and *nan*, and the multiplier
+used for the imaginary part of a number:
+
+>>> sys.hash_info
+sys.hash_info(width=64, modulus=2305843009213693951, inf=314159, nan=0, imag=1000003)
+
 An early decision to limit the inter-operability of various numeric types has
 been relaxed.  It is still unsupported (and ill-advised) to have implicit
 mixing in arithmetic expressions such as ``Decimal('1.1') + float('1.1')``