访问时
vaex.example()
如vaexsphinx 文档主页 https://vaex.readthedocs.io/en/latest/中所述
它提供 404：
import vaex;
df = vaex.example();
dfn = df[0:5][['x','y']];
dfn.describe()
Downloading http://vaex.astro.rug.nl/data/helmi-dezeeuw-2000-10p.hdf5 to /Users/steve/.vaex/data/helmi-dezeeuw-2000-10p.hdf5
--2020-08-29 17:12:10-- http://vaex.astro.rug.nl/data/helmi-dezeeuw-2000-10p.hdf5
Resolving vaex.astro.rug.nl (vaex.astro.rug.nl)... 129.125.6.3
Connecting to vaex.astro.rug.nl (vaex.astro.rug.nl)|129.125.6.3|:80... connected.
HTTP request sent, awaiting response... 301 Moved Permanently
Location: https://vaex.io/data/helmi-dezeeuw-2000-10p.hdf5 [following]
--2020-08-29 17:12:11-- https://vaex.io/data/helmi-dezeeuw-2000-10p.hdf5
Resolving vaex.io (vaex.io)... 172.67.69.63, 104.26.0.195, 104.26.1.195
Connecting to vaex.io (vaex.io)|172.67.69.63|:443... connected.
HTTP request sent, awaiting response... 404 Not Found
2020-08-29 17:12:11 ERROR 404: Not Found.
wget failed, using urlretrieve
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/Users/steve/miniconda3/lib/python3.7/site-packages/vaex/__init__.py", line 575, in example
该数据集是否有更新的网址？