From e2bca44ca3cba1106b1f3e355b74e23a2877451a Mon Sep 17 00:00:00 2001
From: kimth <kimt@mit.edu>
Date: Sun, 19 Aug 2012 12:09:38 -0400
Subject: [PATCH] Simplify is_list_of_files

---
 common/lib/capa/capa/util.py | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

diff --git a/common/lib/capa/capa/util.py b/common/lib/capa/capa/util.py
index 01f5fe4c82..a88c45a335 100644
--- a/common/lib/capa/capa/util.py
+++ b/common/lib/capa/capa/util.py
@@ -49,15 +49,8 @@ def convert_files_to_filenames(answers):
             new_answers[answer_id] = answers[answer_id]
     return new_answers
 
-def is_list_of_files(list_of_files_to_test):
-    if not isinstance(list_of_files_to_test, list):
-        return False
-
-    for li in list_of_files_to_test:
-        if not is_file(li):
-            return False
-
-    return True
+def is_list_of_files(files):
+    return isinstance(files, list) and all(is_file(f) for f in files)
 
 def is_file(file_to_test):
     '''