issues

• [ ] Closes #575
• [ ] Tests added / passed
• [ ] Passes git diff upstream/master **/*py | flake8 --diff
• [ ] Fully documented, including whats-new.rst for all changes and api.rst for new API

MCVE Code Sample

```python import numpy as np import matplotlib.pyplot as plt import xarray as xr

x, y = np.meshgrid(np.arange(12), np.arange(12)) z = xr.DataArray(np.sqrt(x2 + y2)) z2 = xr.DataArray(np.sqrt(x2 + y2)+1) ds = xr.concat([z,z2], dim = 'time') ds['time'] = [0,1]

f, ax = plt.subplots() ds[0].plot.contour(ax = ax, levels=[4], colors=['k']) f, ax = plt.subplots() ds[1].plot.contour(ax = ax, levels=[4], colors=['k']) ds.plot.contour(col = 'time', levels=[4], colors=['k']) ```

Output

Expected Output

Problem Description

While drawing only one contour was fixed some time ago (#866), single contour plots in FacetGrid do not work for me.

Output of xr.show_versions()

According to this plotting example, xlabels and ylabels are labeled with units. However, row labels and column labels omit the units.

MCVE Code Sample

python import xarray as xr ds = xr.tutorial.scatter_example_dataset() ds.plot.scatter(x='A', y='B', col='x', row='z', hue='w', hue_style='discrete')

Expected Output

Should xr.FacetGrid include the functionality for plotting row labels and column labels when provided?

Problem Description

It could be solved with the following included in plot/facetgrid.py#L486: ```python if self.data[self._row_var].attrs.get('units'): units = self.data[self._row_var].attrs['units']
template="{coord} = {value} [{units}]"

title = nicetitle(coord=self._row_var, value=row_name, \ maxchar=maxchar, template = template, units = unit and with the following included in [plot/facetgrid.py#L499](https://github.com/pydata/xarray/blob/c0ef2f616e87e9f924425bcd373ac265f14203cb/xarray/plot/facetgrid.py#L499):python if self.data[self._col_var].attrs.get('units'): units = self.data[self._col_var].attrs['units']
template="{coord} = {value} [{units}]"

title = nicetitle(coord=self._col_var, value=col_name, \ maxchar=maxchar, template = template, units = units) and with the modification of `_nicetitle`:python def _nicetitle(coord, value, maxchar, template, units = None): """ Put coord, value in template and truncate at maxchar """ prettyvalue = format_item(value, quote_strings=False) if units is not None: title = template.format(coord=coord, value=prettyvalue, units = units) else: title = template.format(coord=coord, value=prettyvalue)

if len(title) > maxchar:
    title = title[: (maxchar - 3)] + "..."

return title

```

Output of xr.show_versions()

Code Sample, a copy-pastable example if possible

See my code here

Problem description

I receive 404 HTTP Status through PydapDataStore. The link dataset_url is working though.

Expected Output

xarray.Dataset object

Output of xr.show_versions()

Code Sample, a copy-pastable example if possible

See my code here

Problem description

I received AttributeError: 'PydapArrayWrapper' object has no attribute 'shape' when I tried to open PydapDataStore. However, everything works when I use pydap instead of xarray.

Expected Output

xarray.Dataset object

Output of xr.show_versions()

Consider the following gist where I receive the following error: TypeError: DataArray.name or Dataset key must be either a string or None for serialization to netCDF files.

I think that I run into a bug when DataArray.name is checked by check_name function. I think that k in the corresponding for loop actually represents DataArray not DataArray.name itself. Thus, I suggest something like this to fix it: for k in dataset: check_name(k.name)