made it python 2.4 compatible

Author: Peter Bengtsson

oauth2/__init__.py

@@ -330,11 +330,31 @@ def to_postdata(self):
     def to_url(self):
         """Serialize as a URL for a GET request."""
         base_url = urlparse.urlparse(self.url)
-        query = parse_qs(base_url.query)
+        try:
+            query = base_url.query
+        except AttributeError:
+            # must be python <2.5
+            query = base_url[4]
+        query = parse_qs(query)
         for k, v in self.items():
             query.setdefault(k, []).append(v)
-        url = (base_url.scheme, base_url.netloc, base_url.path, base_url.params,
-               urllib.urlencode(query, True), base_url.fragment)
+        
+        try:
+            scheme = base_url.scheme
+            netloc = base_url.netloc
+            path = base_url.path
+            params = base_url.params
+            fragment = base_url.fragment
+        except AttributeError:
+            # must be python <2.5
+            scheme = base_url[0]
+            netloc = base_url[1]
+            path = base_url[2]
+            params = base_url[3]
+            fragment = base_url[5]
+        
+        url = (scheme, netloc, path, params,
+               urllib.urlencode(query, True), fragment)
         return urlparse.urlunparse(url)
 
     def get_parameter(self, parameter):