Added exist_all_elements_from_a_in_b().

tools/oneclick/base/common.py

@@ -421,6 +421,17 @@ def index_a_in_multi_b(a, b):
         pass
     return None
 
+def exist_all_elements_from_a_in_b(a, b):
+    """Return True if all elements in a are also in list b, else return False.
+       
+       Both a and b can be a one dimensional list or a single object.
+    """
+    for i in listify(a):
+        if i not in listify(b):
+            return False
+    return True
+    
+
 def find_indices_where(in_list, value, condition=operator.eq):
     """Return list of indices in in_list that match the condition value