diff --git a/crawl_cals.py b/crawl_cals.py
index d0d1379..ce40125 100755
--- a/crawl_cals.py
+++ b/crawl_cals.py
@@ -3,12 +3,15 @@
 Crawl calibration files, create and ingest calibration datasets.
 """
 
+from future import standard_library
+standard_library.install_aliases()
+from builtins import str
 import os, sys, re, json, logging, traceback, requests, argparse, backoff, shutil
 from datetime import datetime
 from requests.packages.urllib3.exceptions import (InsecureRequestWarning,
                                                   InsecurePlatformWarning)
 try: from html.parser import HTMLParser
-except: from HTMLParser import HTMLParser
+except: from html.parser import HTMLParser
 
 from osaka.main import get, rmall
 
@@ -194,7 +197,7 @@ def create_active_cal_ds(active_ids, dataset_version, root_ds_dir="."):
     ds_id = id
     root_ds_dir = os.path.abspath(root_ds_dir)
     ds_dir = os.path.join(root_ds_dir, ds_id)
-    if not os.path.isdir(ds_dir): os.makedirs(ds_dir, 0755)
+    if not os.path.isdir(ds_dir): os.makedirs(ds_dir, 0o755)
 
     # dump dataset and met JSON
     ds_file = os.path.join(ds_dir, "%s.dataset.json" % ds_id)
diff --git a/crawl_orbits.py b/crawl_orbits.py
index bdac054..5b344a0 100755
--- a/crawl_orbits.py
+++ b/crawl_orbits.py
@@ -3,13 +3,16 @@
 Crawl orbits and submit orbit dataset generation jobs.
 """
 
+from future import standard_library
+standard_library.install_aliases()
+from builtins import str
 import os, sys, re, json, logging, traceback, requests, argparse, backoff
 from datetime import datetime
 from pprint import pformat
 from requests.packages.urllib3.exceptions import (InsecureRequestWarning,
                                                   InsecurePlatformWarning)
 try: from html.parser import HTMLParser
-except: from HTMLParser import HTMLParser
+except: from html.parser import HTMLParser
 
 from hysds_commons.job_utils import submit_mozart_job
 from hysds.celery import app
diff --git a/create_cal_ds.py b/create_cal_ds.py
index 22a4bfe..24f17ff 100755
--- a/create_cal_ds.py
+++ b/create_cal_ds.py
@@ -3,6 +3,7 @@
 Create a HySDS dataset from a Sentinel1 calibration tar file.
 """
 
+from builtins import str
 import os, sys, time, re, json, requests, shutil, logging, traceback, argparse, backoff
 from requests.packages.urllib3.exceptions import (InsecureRequestWarning,
                                                   InsecurePlatformWarning)
@@ -82,7 +83,7 @@ def create_dataset(ds, met, cal_tar_file, root_ds_dir="."):
     id = met['data_product_name']
     root_ds_dir = os.path.abspath(root_ds_dir)
     ds_dir = os.path.join(root_ds_dir, id)
-    if not os.path.isdir(ds_dir): os.makedirs(ds_dir, 0755)
+    if not os.path.isdir(ds_dir): os.makedirs(ds_dir, 0o755)
 
     # dump dataset and met JSON
     ds_file = os.path.join(ds_dir, "%s.dataset.json" % id)
diff --git a/create_orbit_ds.py b/create_orbit_ds.py
index a57f918..eedd598 100755
--- a/create_orbit_ds.py
+++ b/create_orbit_ds.py
@@ -3,6 +3,7 @@
 Create a HySDS dataset from a Sentinel1 precise or restituted orbit.
 """
 
+from builtins import str
 import os, sys, time, re, json, requests, shutil, logging, traceback, argparse
 from datetime import datetime, timedelta
 
@@ -45,7 +46,7 @@ def create_dataset(ds, met, orbit_file, root_ds_dir="."):
     id = met['data_product_name']
     root_ds_dir = os.path.abspath(root_ds_dir)
     ds_dir = os.path.join(root_ds_dir, id)
-    if not os.path.isdir(ds_dir): os.makedirs(ds_dir, 0755)
+    if not os.path.isdir(ds_dir): os.makedirs(ds_dir, 0o755)
 
     # dump dataset and met JSON
     ds_file = os.path.join(ds_dir, "%s.dataset.json" % id)