From 0f6a656ec1145d52d0226ca4ce28fe32c44529bb Mon Sep 17 00:00:00 2001
From: Raymond Hettinger <python@rcn.com>
Date: Fri, 11 Jan 2008 18:04:55 +0000
Subject: [PATCH] Speed-up and simplify code urlparse's result objects.

---
 Lib/urlparse.py | 58 +++++--------------------------------------------
 1 file changed, 6 insertions(+), 52 deletions(-)

diff --git a/Lib/urlparse.py b/Lib/urlparse.py
index 7a2e6ce7461..ada61429894 100644
--- a/Lib/urlparse.py
+++ b/Lib/urlparse.py
@@ -37,46 +37,11 @@ _parse_cache = {}
 
 def clear_cache():
     """Clear the parse cache."""
-    global _parse_cache
-    _parse_cache = {}
+    _parse_cache.clear()
 
 
-class BaseResult(tuple):
-    """Base class for the parsed result objects.
-
-    This provides the attributes shared by the two derived result
-    objects as read-only properties.  The derived classes are
-    responsible for checking the right number of arguments were
-    supplied to the constructor.
-
-    """
-
-    __slots__ = ()
-
-    # Attributes that access the basic components of the URL:
-
-    @property
-    def scheme(self):
-        return self[0]
-
-    @property
-    def netloc(self):
-        return self[1]
-
-    @property
-    def path(self):
-        return self[2]
-
-    @property
-    def query(self):
-        return self[-2]
-
-    @property
-    def fragment(self):
-        return self[-1]
-
-    # Additional attributes that provide access to parsed-out portions
-    # of the netloc:
+class ResultMixin(object):
+    """Shared methods for the parsed result objects."""
 
     @property
     def username(self):
@@ -116,31 +81,20 @@ class BaseResult(tuple):
             return int(port, 10)
         return None
 
+from collections import namedtuple
 
-class SplitResult(BaseResult):
+class SplitResult(namedtuple('SplitResult', 'scheme netloc path query fragment'), ResultMixin):
 
     __slots__ = ()
 
-    def __new__(cls, scheme, netloc, path, query, fragment):
-        return BaseResult.__new__(
-            cls, (scheme, netloc, path, query, fragment))
-
     def geturl(self):
         return urlunsplit(self)
 
 
-class ParseResult(BaseResult):
+class ParseResult(namedtuple('ParseResult', 'scheme netloc path params query fragment'), ResultMixin):
 
     __slots__ = ()
 
-    def __new__(cls, scheme, netloc, path, params, query, fragment):
-        return BaseResult.__new__(
-            cls, (scheme, netloc, path, params, query, fragment))
-
-    @property
-    def params(self):
-        return self[3]
-
     def geturl(self):
         return urlunparse(self)