Mention that crc32 and adler32 are available in a different module (zlib).

Some people look for them in hashlib.

diff --git a/Doc/library/hashlib.rst b/Doc/library/hashlib.rst
index 8bba7188ab28f0280ce737f3afbb3123e0c81451..bfb007f2d86e3279a24657bd79c356cff90d1b27 100644 (file)
--- a/Doc/library/hashlib.rst
+++ b/Doc/library/hashlib.rst
@@ -21,6 +21,10 @@ algorithm (defined in Internet :rfc:`1321`). The terms secure hash and message
 digest are interchangeable.  Older algorithms were called message digests.  The
 modern term is secure hash.
 
+.. note::
+   If you want the adler32 or crc32 hash functions they are available in
+   the :mod:`zlib` module.
+
 .. warning::
 
    Some algorithms have known hash collision weaknesses, see the FAQ at the end.

diff --git a/Lib/hashlib.py b/Lib/hashlib.py
index f7c0211a6dd61bce94440df079b466d68f755bf5..13124e2c0b2e205d04e27d23e3abd90b22669ee9 100644 (file)
--- a/Lib/hashlib.py
+++ b/Lib/hashlib.py
@@ -18,6 +18,9 @@ md5(), sha1(), sha224(), sha256(), sha384(), and sha512()
 More algorithms may be available on your platform but the above are
 guaranteed to exist.
 
+NOTE: If you want the adler32 or crc32 hash functions they are available in
+the zlib module.
+
 Choose your hash function wisely.  Some have known collision weaknesses.
 sha384 and sha512 will be slow on 32 bit platforms.