trouble with urllib

```python
# get the data

import os
import tarfile
import urllib
DOWNLOAD_ROOT = 'https://raw.githubusercontent.com/ageron/handson-ml2/master/'
HOUSING_PATH = os.path.join('datasets', 'housing')
HOUSING_URL = DOWNLOAD_ROOT + 'datasets/housing/housing.tgz'

def fetch_housing_data(housing_url=HOUSING_URL, housing_path=HOUSING_PATH):
os.makedirs(housing_path, exist_ok=True)
tgz_path = os.path.join(housing_path, 'housing.tgz')
urllib.request.urlretrieve(housing_url, tgz_path)
housing_tgz = tarfile.open(tgz_path)
housing_tgz.extractall(path=housing_path)
housing_tgz.close()
```
Not really an error with the code in this notebook but in the book. If you use urllib.request method and error will be thrown as it cannot recognise this method.

The workaround I used was ```import urllib.request```. But I see ```from six.moves import urllib``` is used instead.

I don't know if anyone found this was a problem or was discussed. Just through my two cents in there and hoping it will help.