Plot title using loc keyword doesn't override automated title

[ahuang11]

import xarray as xr
import matplotlib.pyplot as plt

ds = xr.tutorial.open_dataset('air_temperature')['air'].isel(time=0)

This works as expected

ax = plt.axes()
ds.plot(x='lon', y='lat', ax=ax)
ax.set_title('new_title')

This doesn't

ax = plt.axes()
ds.plot(x='lon', y='lat', ax=ax)
ax.set_title('new_title', loc='left')

With non-default loc, the old title still shows

xarray: 0.12.1 pandas: 0.23.4 numpy: 1.15.1 scipy: 1.1.0 netCDF4: 1.4.0 pydap: None h5netcdf: 0.6.1 h5py: 2.9.0 Nio: None zarr: None cftime: 1.0.0 nc_time_axis: None PseudonetCDF: None rasterio: 1.0.1 cfgrib: None iris: None bottleneck: 1.2.1 dask: 1.1.1 distributed: 1.25.3 matplotlib: 3.1.0 cartopy: 0.17.0 seaborn: 0.8.1 setuptools: 39.1.0 pip: 19.0.1 conda: 4.6.14 pytest: 3.5.1 IPython: 6.4.0 sphinx: 1.7.4

[dcherian]

plot calls set_title by default. Not replacing the existing title is matplotlib's default behaviour. (see below). I would just call ax.set_title('') before setting your final title.

ax = plt.gca()
ax.set_title('a')
ax.set_title('b', loc='left')

[ahuang11]

Cool; that's good to know that I can set a title on the top left and top right side together. Thanks.