Can't run example code with Python 3

[forcecore]

Python example code can't be run, as they are written with Python 2.

Steps to reproduce: just run with Python 3

{ image-classification } » python3 train_mnist.py
2016-11-27 01:37:30,367 Node[0] start with arguments Namespace(batch_size=128, data_dir='mnist/', gpus=None, kv_store='local', load_epoch=None, lr=0.1, lr_factor=1, lr_factor_epoch=1, model_prefix=None, network='mlp', num_epochs=10, num_examples=60000, save_model_prefix=None)
Traceback (most recent call last):
File "train_mnist.py", line 161, in
train_model.fit(args, net, get_iterator(data_shape))
File "D:\work\tmp\mxnet-master\example\image-classification\train_model.py", line 51, in fit
(train, val) = data_loader(args, kv)
File "train_mnist.py", line 89, in get_iterator_impl
_download(data_dir)
File "train_mnist.py", line 17, in _download
urllib.urlretrieve("http://data.mxnet.io/mxnet/data/mnist.zip", zippath)
AttributeError: module 'urllib' has no attribute 'urlretrieve'

This is because Python 3 no longer has urllib.

http://stackoverflow.com/questions/17960942/attributeerror-module-object-has-no-attribute-urlretrieve

please, migrate to Python 3! It is painful to have 2 and 3 on the system, especially on Windows.

[piiswrong]

We won't migrate to py3 but will try to keep python 2/3 compatibility.
You are welcome to submit a PR to make it compatible with python 2 and 3.

Otherwise, we'll try to find someone to fix it.
@nswamy @leopd do you have time to take a look?

[leopd]

Thanks for bringing the py3 incompatibility to our attention. I'd also like to make sure everything workings with py3, and can take a look at this issue later in the week.

[giorgioercixu]

this should be already fixed by #3999

[forcecore]

~/work/mxnet/example/image-classification/train_mnist.py works now :)

Still, there are more scripts with print operators.
{ rcnn } master » python3 -u train_end2end.py ~/work/mxnet/example/rcnn
File "train_end2end.py", line 51
print 'providing maximum shape', max_data_shape, max_label_shape

[yajiedesign]

This issue is closed due to lack of activity in the last 90 days. Feel free to reopen if this is still an active issue. Thanks!