Use string mode to open tempfile for py3 compat

bob/bio/base/test/test_config_file.py

@@ -13,7 +13,7 @@ from ..script.verify import parse_arguments
 def tmp_file(contents):
   '''Generates a temporary configuration file with the contents on the input'''
 
-  retval = tempfile.NamedTemporaryFile()
+  retval = tempfile.NamedTemporaryFile('w')
   retval.write('\n'.join(contents) + '\n')
   retval.flush()
   return retval