shorter impl of is_file

common/lib/capa/capa/util.py

@@ -53,8 +53,4 @@ def is_file(file_to_test):
     '''
     Duck typing to check if 'file_to_test' is a File object
     '''
-    is_file = True
-    for method in ['read', 'name']:
-        if not hasattr(file_to_test, method):
-            is_file = False
-    return is_file 
+    return all(hasattr(file_to_test, method) for method in ['read', 'name'])