pep8

src/calibre/ebooks/metadata/sources/base.py

@@ -495,7 +495,7 @@ class Source(Plugin):
         that could result in a generic cover image or a not found error.
         '''
         return None
-    
+
     def id_from_url(self, url):
         '''
         Parse a URL and return a tuple of the form:
@@ -505,7 +505,6 @@ class Source(Plugin):
         '''
         return None
 
-
     def identify_results_keygen(self, title=None, authors=None,
             identifiers={}):
         '''

src/calibre/gui2/metadata/basic_widgets.py

@@ -1668,7 +1668,7 @@ class IdentifiersEdit(QLineEdit, ToMetadataMixin):
         text = unicode(QApplication.clipboard().text()).strip()
         if not text:
             return False
-        
+
         rules = msprefs['id_link_rules']
         if rules:
             formatter = EvalFormatter()