From 485c33d17c9e28c081daad6377578e00ef34928c Mon Sep 17 00:00:00 2001
From: Brian Wellington <bwelling@xbill.org>
Date: Tue, 19 May 2020 10:08:15 -0700
Subject: [PATCH] Replace dicts with sets.

---
 dns/rdataclass.py |  5 +----
 dns/rdatatype.py  | 14 +++-----------
 dns/tokenizer.py  | 12 ++----------
 3 files changed, 6 insertions(+), 25 deletions(-)

diff --git a/dns/rdataclass.py b/dns/rdataclass.py
index 300de40b..828812c7 100644
--- a/dns/rdataclass.py
+++ b/dns/rdataclass.py
@@ -36,10 +36,7 @@ class RdataClass(enum.IntEnum):
 
 globals().update(RdataClass.__members__)
 
-_metaclasses = {
-    NONE: True,
-    ANY: True
-}
+_metaclasses = {NONE, ANY}
 
 _unknown_class_pattern = re.compile('CLASS([0-9]+)$', re.I)
 
diff --git a/dns/rdatatype.py b/dns/rdatatype.py
index 68a5c2b9..fc8c7173 100644
--- a/dns/rdatatype.py
+++ b/dns/rdatatype.py
@@ -102,17 +102,9 @@ _registered_by_value = {}
 
 globals().update(RdataType.__members__.items())
 
-_metatypes = {
-    OPT: True
-}
-
-_singletons = {
-    SOA: True,
-    NXT: True,
-    DNAME: True,
-    NSEC: True,
-    CNAME: True,
-}
+_metatypes = {OPT}
+
+_singletons = {SOA, NXT, DNAME, NSEC, CNAME}
 
 _unknown_type_pattern = re.compile('TYPE([0-9]+)$', re.I)
 
diff --git a/dns/tokenizer.py b/dns/tokenizer.py
index 547e030f..791e9948 100644
--- a/dns/tokenizer.py
+++ b/dns/tokenizer.py
@@ -24,16 +24,8 @@ import dns.exception
 import dns.name
 import dns.ttl
 
-_DELIMITERS = {
-    ' ': True,
-    '\t': True,
-    '\n': True,
-    ';': True,
-    '(': True,
-    ')': True,
-    '"': True}
-
-_QUOTING_DELIMITERS = {'"': True}
+_DELIMITERS = {' ', '\t', '\n', ';', '(', ')', '"'}
+_QUOTING_DELIMITERS = {'"'}
 
 EOF = 0
 EOL = 1
-- 
2.47.3