quick fix of a bug related to using {}

git-svn-id: https://oauth.googlecode.com/svn/code/python@601 f7ae4463-c52f-0410-a7dc-93bad6e629e8

Author: [email protected]

oauth/oauth.py

@@ -171,8 +171,10 @@ def build_signature(self, signature_method, consumer, token):
         return signature_method.build_signature(self, consumer, token)
 
     @staticmethod
-    def from_request(http_method, http_url, headers=None, parameters={}, query_string=None):
+    def from_request(http_method, http_url, headers=None, parameters=None, query_string=None):
         # combine multiple parameter sources
+        if parameters is None:
+            parameters = {}
 
         # headers
         if headers and 'Authorization' in headers:
@@ -518,4 +520,4 @@ def build_signature_base_string(self, oauth_request, consumer, token):
         return sig
 
     def build_signature(self, oauth_request, consumer, token):
-        return self.build_signature_base_string(oauth_request, consumer, token)
+        return self.build_signature_base_string(oauth_request, consumer, token)