fix iris example to work with python3 (#19335)

iris.py did not work with python3 as urllib.urlopen is not in python3.
Switched to urlretrive from six. Same was done in:
tensorflow/examples/image_retraining/retrain.py

1 files changed, 3 insertions, 4 deletions

diff --git a/tensorflow/examples/learn/iris.py b/tensorflow/examples/learn/iris.py
index 03e60972aa..86f5204ec3 100644
--- a/tensorflow/examples/learn/iris.py
+++ b/tensorflow/examples/learn/iris.py
@@ -21,7 +21,8 @@ from __future__ import division
 from __future__ import print_function
 
 import os
-import urllib
+
+from six.moves.urllib.request import urlretrieve
 
 import tensorflow as tf
 
@@ -38,9 +39,7 @@ FEATURE_KEYS = ['sepal_length', 'sepal_width', 'petal_length', 'petal_width']
 def maybe_download_iris_data(file_name, download_url):
   """Downloads the file and returns the number of data."""
   if not os.path.exists(file_name):
-    raw = urllib.urlopen(download_url).read()
-    with open(file_name, 'w') as f:
-      f.write(raw)
+    urlretrieve(download_url, file_name)
 
   # The first line is a comma-separated string. The first one is the number of
   # total data in the file.