On 9 Dec 2010, at 22:12, Casey Deccio wrote:
> On Thu, Dec 9, 2010 at 4:22 PM, Casey Deccio <[email protected]> wrote:
>
> Sorry for the self-reply, but I just found my answer. The __hash__()
> method is used for operations on members of hashed collections, like
> dict [1]. The default for new-style classes is to use id(), which is
> why my tests are failing.
>
> For now I can subclass and define my own hash of the rdata.
Try the patch below for the hash. It should result in equal rdatas having
equal hashes, and works even if the rdatas have relativized names. I'm not
inclined to add hash support to rdatasets or rrsets as they are not nominally
immutable.
/Bob
diff --git a/dns/rdata.py b/dns/rdata.py
index ce02686..399677e 100644
--- a/dns/rdata.py
+++ b/dns/rdata.py
@@ -28,6 +28,7 @@ chunk of hexstring that _hexify() produces before whitespace
occurs.
import cStringIO
import dns.exception
+import dns.name
import dns.rdataclass
import dns.rdatatype
import dns.tokenizer
@@ -252,6 +253,9 @@ class Rdata(object):
return NotImplemented
return self._cmp(other) > 0
+ def __hash__(self):
+ return hash(self.to_digestable(dns.name.root))
+
def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True):
"""Build an rdata object from text format.
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