对.metpy.parse_cf()调用xarray.Dataset给出的“ctable”没有定义

Question

对.metpy.parse_cf()调用xarray.Dataset给出的“ctable”没有定义

import xarray as xr
import metpy
ds = xr.open_dataset('https://thredds.ucar.edu/thredds/dodsC/grib/NCEP/GFS/Global_0p25deg/Best')
>>> ds.metpy.parse_cf('u-component_of_wind_height_above_ground')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/ray/local/bin/anaconda3/envs/dev/lib/python3.8/site-packages/metpy/xarray.py", line 512, in parse_cf
    from .plots.mapping import CFProjection
  File "/home/ray/local/bin/anaconda3/envs/dev/lib/python3.8/site-packages/metpy/plots/__init__.py", line 19, in <module>
    __all__ = ctables.__all__[:]  # pylint: disable=undefined-variable
NameError: name 'ctables' is not defined

Answer 1

这通常是cartopy>=0.18和MetPy<=0.12.1的版本问题。如果您可以更新到至少MetPy>=0.12.2，，那么应该可以修复这个问题。在某些情况下，MetPy不再支持的旧版本的cartopy (返回到cartopy=0.14)中也出现了这种情况，所以请检查cartopy相对来说是最新的。