Use NamedTemporaryFile opened in text mode

lib/galaxy/tools/wrappers.py

@@ -1,15 +1,11 @@
 import logging
-import os
 import tempfile
 
 from six import string_types, text_type
 from six.moves import shlex_quote
 
 from galaxy import exceptions
-from galaxy.util import (
-    odict,
-    smart_str,
-)
+from galaxy.util import odict
 from galaxy.util.none_like import NoneDataset
 from galaxy.util.object_wrapper import wrap_with_safe_string
 
@@ -321,10 +317,10 @@ class HasDatasets(object):
         return DatasetFilenameWrapper(dataset, **wrapper_kwds)
 
     def paths_as_file(self, sep="\n"):
-        handle, filepath = tempfile.mkstemp(prefix="gx_file_list", dir=self.job_working_directory)
         contents = sep.join(map(str, self))
-        os.write(handle, smart_str(contents))
-        os.close(handle)
+        with tempfile.NamedTemporaryFile(mode='w+', prefix="gx_file_list", dir=self.job_working_directory, delete=False) as fh:
+            fh.write(contents)
+            filepath = fh.name
         return filepath