diff --git a/ox/fixunicode.py b/ox/fixunicode.py
index b49e277..b649a58 100644
--- a/ox/fixunicode.py
+++ b/ox/fixunicode.py
@@ -6,7 +6,7 @@ from __future__ import print_function
 
 import unicodedata
 
-from six import unichr, PY3
+from six import unichr, PY2
 
 __all__ = ['fix_bad_unicode']
 
@@ -151,10 +151,10 @@ def text_badness(text):
     - Improbable single-byte characters, such as ƒ or ¬
     - Letters in somewhat rare scripts
     '''
-    if PY3:
-        assert isinstance(text, str)
-    else:
+    if PY2:
         assert isinstance(text, unicode)
+    else:
+        assert isinstance(text, str)
     errors = 0
     very_weird_things = 0
     weird_things = 0
diff --git a/ox/html.py b/ox/html.py
index 13524fd..7154e21 100644
--- a/ox/html.py
+++ b/ox/html.py
@@ -117,7 +117,7 @@ def clean_html(text):
         * Removes stuff like "<p>&nbsp;&nbsp;</p>", but only if it's at the
           bottom of the text.
     """
-    from text import normalize_newlines
+    from .text import normalize_newlines
     text = normalize_newlines(text)
     text = re.sub(r'<(/?)\s*b\s*>', '<\\1strong>', text)
     text = re.sub(r'<(/?)\s*i\s*>', '<\\1em>', text)
diff --git a/ox/net.py b/ox/net.py
index e125133..46ef0e1 100644
--- a/ox/net.py
+++ b/ox/net.py
@@ -8,7 +8,7 @@ import os
 import re
 import struct
 
-from six import BytesIO, PY3
+from six import BytesIO, PY2
 from six.moves import urllib
 from chardet.universaldetector import UniversalDetector
 
@@ -52,14 +52,14 @@ def get_json(url, data=None, headers=DEFAULT_HEADERS):
     return json.loads(read_url(url, data, headers).decode('utf-8'))
 
 def open_url(url, data=None, headers=DEFAULT_HEADERS):
-    if PY3:
-        if isinstance(url, bytes):
-            url = url.decode('utf-8')
-    else:
+    if PY2:
         if not isinstance(url, bytes):
             url = url.encode('utf-8')
+    else:
+        if isinstance(url, bytes):
+            url = url.decode('utf-8')
     url = url.replace(' ', '%20')
-    if data and PY3 and not isinstance(data, bytes):
+    if data and not PY2 and not isinstance(data, bytes):
         data = data.encode('utf-8')
     req = urllib.request.Request(url, data, headers)
     return urllib.request.urlopen(req)