false isn't defined, that must be False

false must be written as False

monkeysign/gpg.py

@@ -125,7 +125,7 @@ class Context():
         if option in self.options:
             del self.options[option]
         else:
-            return false
+            return False
 
     def build_command(self, command):
         """internal helper to build a proper gpg commandline