Better wording.

Author: JulienPalard

jsonpatch.py

@@ -553,11 +553,16 @@ def __init__(self, patch, pointer_cls=JsonPointer):
         self.patch = patch
         self.pointer_cls = pointer_cls
 
+
         # Verify that the structure of the patch document
         # is correct by retrieving each patch element.
         # Much of the validation is done in the initializer
         # though some is delayed until the patch is applied.
         for op in self.patch:
+            if isinstance(op, basestring):
+                raise InvalidJsonPatch("Document is expected to be sequence of "
+                                       "operations, got a sequence of strings.")
+
             self._get_operation(op)
 
     def __str__(self):
@@ -671,8 +676,6 @@ def apply(self, obj, in_place=False):
         return obj
 
     def _get_operation(self, operation):
-        if isinstance(operation, basestring):
-            raise InvalidJsonPatch("Operation is expected to be a mapping, got a string.")
         if 'op' not in operation:
             raise InvalidJsonPatch("Operation does not contain 'op' member")