Fix some python 3.4 errors

.travis.yml

@@ -1,4 +1,5 @@
 language: python
+python: 3.4
 
 jdk: oraclejdk7
 

luigi/contrib/hdfs/snakebite_client.py

@@ -50,7 +50,9 @@ def __init__(self):
     def list_path(path):
         if isinstance(path, list) or isinstance(path, tuple):
             return path
-        if isinstance(path, str) or isinstance(path, unicode):
+        # TODO: Should this be:
+        # isinstance(path, (six.text_type, six.binary_type))?
+        if isinstance(path, six.string_types):
             return [path, ]
         return [str(path), ]
 

luigi/contrib/hdfs/target.py

@@ -25,11 +25,8 @@
 from luigi.contrib.hdfs.config import tmppath
 from luigi.contrib.hdfs import format as hdfs_format
 from luigi.contrib.hdfs import clients as hdfs_clients
-
-try:
-    from urlparse import urlsplit
-except ImportError:
-    from urllib.parse import urlsplit
+from luigi.six.moves.urllib import parse as urlparse
+from luigi.six.moves import range
 
 
 class HdfsTarget(FileSystemTarget):
@@ -89,7 +86,7 @@ def __init__(self, path=None, format=None, is_tmp=False, fs=None):
         self.format = format
 
         self.is_tmp = is_tmp
-        (scheme, netloc, path, query, fragment) = urlsplit(path)
+        (scheme, netloc, path, query, fragment) = urlparse.urlsplit(path)
         if ":" in path:
             raise ValueError('colon is not allowed in hdfs filenames')
         self._fs = fs or hdfs_clients.get_autoconfig_client()
@@ -167,7 +164,7 @@ def is_writable(self):
             parts = self.path.split("/")
             # start with the full path and then up the tree until we can check
             length = len(parts)
-            for part in xrange(length):
+            for part in range(length):
                 path = "/".join(parts[0:length - part]) + "/"
                 if self.fs.exists(path):
                     # if the path exists and we can write there, great!

luigi/date_interval.py

@@ -125,7 +125,8 @@ def __cmp__(self, other):
         if not isinstance(self, type(other)):
             # doing this because it's not well defined if eg. 2012-01-01-2013-01-01 == 2012
             raise TypeError('Date interval type mismatch')
-        return cmp((self.date_a, self.date_b), (other.date_a, other.date_b))
+
+        return (self > other) - (self < other)
 
     def __lt__(self, other):
         if not isinstance(self, type(other)):