issues: 275033174

This data as json

id node_id number title user state locked assignee milestone comments created_at updated_at closed_at author_association active_lock_reason draft pull_request body reactions performed_via_github_app state_reason repo type
275033174 MDU6SXNzdWUyNzUwMzMxNzQ= 1727 IPython auto-completion triggers data loading 4160723 closed 0     11 2017-11-18T00:14:00Z 2017-11-18T07:09:41Z 2017-11-18T07:09:40Z MEMBER      

I create a big netcdf file like this:

```python In [1]: import xarray as xr

In [2]: import numpy as np

In [3]: ds = xr.Dataset({'myvar': np.arange(100000000, dtype='float64')})

In [4]: ds.to_netcdf('test.nc')

```

Then when I open the file in a IPython console and I use auto-completion, it triggers loading the data.

```python In [1]: import xarray as xr

In [2]: ds = xr.open_dataset('test.nc')

In [3]: ds.my # <TAB> autocompletion with any character -> triggers loading ```

I don't have that issue using the python console. Auto-completion for dictionary access in IPython (#1632) works fine too.

Output of xr.show_versions()

commit: None python: 3.6.3.final.0 python-bits: 64 OS: Darwin OS-release: 16.7.0 machine: x86_64 processor: i386 byteorder: little LC_ALL: None LANG: fr_BE.UTF-8 LOCALE: fr_BE.UTF-8 xarray: 0.10.0rc1-2-gf83361c pandas: 0.21.0 numpy: 1.13.1 scipy: 0.19.1 netCDF4: 1.3.1 h5netcdf: 0.5.0 Nio: None bottleneck: 1.2.1 cyordereddict: None dask: 0.15.4 matplotlib: None cartopy: None seaborn: None setuptools: 36.6.0 pip: 9.0.1 conda: None pytest: None IPython: 6.2.1 sphinx: None 
{
    "url": "https://api.github.com/repos/pydata/xarray/issues/1727/reactions",
    "total_count": 1,
    "+1": 1,
    "-1": 0,
    "laugh": 0,
    "hooray": 0,
    "confused": 0,
    "heart": 0,
    "rocket": 0,
    "eyes": 0
}
   completed 13221727 issue

Links from other tables