fix comments

apitools/base/py/list_pager.py

@@ -68,7 +68,7 @@ def YieldFromList(
         current_token_attribute='pageToken',
         next_token_attribute='nextPageToken',
         batch_size_attribute='maxResults',
-        get_field_fn=_GetattrNested):
+        get_field_func=_GetattrNested):
     """Make a series of List requests, keeping track of page tokens.
 
     Args:
@@ -95,7 +95,8 @@ def YieldFromList(
           response message holding the maximum number of results to be
           returned. None if caller-specified batch size is unsupported.
           If a tuple, path to the attribute.
-      get_field_fn: lambda, A function that returns the items to be yielded.
+      get_field_func: Function that returns the items to be yielded. Argument
+          is response message, and field.
 
     Yields:
       protorpc.message.Message, The resources listed by the service.
@@ -118,7 +119,7 @@ def YieldFromList(
             _SetattrNested(request, batch_size_attribute, request_batch_size)
         response = getattr(service, method)(request,
                                             global_params=global_params)
-        items = get_field_fn(response, field)
+        items = get_field_func(response, field)
         if predicate:
             items = list(filter(predicate, items))
         for item in items:

apitools/base/py/list_pager_test.py

@@ -289,7 +289,7 @@ def Custom_Getter(message, attribute):
         client = fusiontables.FusiontablesV1(get_credentials=False)
         request = messages.FusiontablesColumnListRequest(tableId='mytable')
         results = list_pager.YieldFromList(
-            client.column, request, get_field_fn=Custom_Getter)
+            client.column, request, get_field_func=Custom_Getter)
 
         self._AssertInstanceSequence(results, 1)
         self.assertEquals(1, len(custom_getter_called))