Fix bool not working for KeyCombination

1 files changed, 4 insertions, 1 deletions

diff --git a/keyboardpython/key.py b/keyboardpython/key.py
index 278668d..b820631 100644
--- a/keyboardpython/key.py
+++ b/keyboardpython/key.py
@@ -45,7 +45,7 @@ class KeyCombination:
         return hash(str(self))
 
     def __nonzero__(self):
-        return bool(self.keys())
+        return bool(self.string)
 
     def contains_key(self,key):
         ''' is key in this combination? '''
@@ -58,6 +58,7 @@ class KeyCombination:
         if self.contains_key(_key): return
         self.keys.append(_key)
         self.keys = list(set(self.keys))
+        self.string = self.__string()
 
     def remove_key(self,key):
         ''' remove key from this combination '''
@@ -65,12 +66,14 @@ class KeyCombination:
         if key in self.keys:
             key_index = self.keys.index(key)
             self.keys.pop(key_index)
+        self.string = self.__string()
 
     def add_keyCombination(self,key_comb):
         ''' add each key from key_comb to this combination '''
         assert isinstance(key_comb,KeyCombination)
         for _key in key_comb.keys: self.keys.append(_key)
         self.keys = list(set(self.keys))
+        self.string = self.__string()
 
     def diff(self,key_comb):
         ''' return keys in key_comb that aren't in this combination '''