diff --git a/src/calibre/gui2/preferences/template_functions.py b/src/calibre/gui2/preferences/template_functions.py
index f02b6bf2ac..00957f4042 100644
--- a/src/calibre/gui2/preferences/template_functions.py
+++ b/src/calibre/gui2/preferences/template_functions.py
@@ -8,7 +8,7 @@ __docformat__ = 'restructuredtext en'
 
 import json, traceback
 
-from PyQt5.Qt import Qt, QDialogButtonBox, QSizePolicy
+from PyQt5.Qt import QDialogButtonBox
 
 from calibre.gui2 import error_dialog, warning_dialog
 from calibre.gui2.preferences import ConfigWidgetBase, test_widget
diff --git a/src/calibre/utils/formatter_functions.py b/src/calibre/utils/formatter_functions.py
index d6992a78d8..d41e2e2b49 100644
--- a/src/calibre/utils/formatter_functions.py
+++ b/src/calibre/utils/formatter_functions.py
@@ -1825,6 +1825,7 @@ class FormatterUserFunction(FormatterFunction):
     def to_pref(self):
         return [self.name, self.doc, self.arg_count, self.program_text]
 
+
 tabs = re.compile(r'^\t*')
 
 
@@ -1837,9 +1838,11 @@ def function_pref_is_python(pref):
         return False
     raise ValueError('Unknown program type in formatter function pref')
 
+
 def function_pref_name(pref):
     return pref[0]
 
+
 def compile_user_function(name, doc, arg_count, eval_func):
     if not function_pref_is_python(eval_func):
         return FormatterUserFunction(name, doc, arg_count, eval_func, False)