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[python #MVR-694466]: Cartopy (0.14.2) / MetPy (0.12.2) parse(cf) error when using Google Colab

Greetings!

I went ahead and answered your Stack Overflow question here:

  
https://stackoverflow.com/questions/64979083/cartopy-0-14-2-metpy-0-12-2-parsecf-error-when-using-google-colab/64979958#64979958

We can continue any needed discussion there.

Ryan

> Hi All:
> I have a student facing a problem that is similar to what others are 
> reporting when using older versions of MetPy and Cartopy.
> The issue is the parse_cf() command under metpy. And it's happening under 
> Google Colaboratory, of which I have little experience. Things are working 
> fine on other platforms (anaconda, miniconda, homebrew, etc)
> Previous feedback I've seen refers to rolling back the version of the cartopy 
> library from 0.18.*. I have also followed previously posted guidance on 
> Shapely, but we cannot seem to be able to change the versions of cartopy or 
> metpy version in Google CoLab.
> The version information for the environment and python libraries, followed by 
> the code and error is below.
> I'm at a loss here and have troubleshot it for my student about as far as I 
> can go. Guidance would be appreciated by both of us.
> System and Package Information
> MetPy                         0.12.2
> Cartopy                       0.14.2
> 3.6.9 (default, Oct  8 2020, 12:12:24)
> [GCC 8.4.0]
> Linux d8a71c5140a6 4.19.112+ #1 SMP Thu Jul 23 08:00:38 PDT 2020 x86_64 
> x86_64 x86_64 GNU/Linux
> Linux-4.19.112+-x86_64-with-Ubuntu-18.04-bionic
> 
> python-cartopy/bionic,now 0.14.2+dfsg1-2build3 amd64 [installed]
> python3-cartopy/bionic,now 0.14.2+dfsg1-2build3 amd64 [installed]
> Code to Replicate
> import numpy as np
> import cartopy as c
> import metpy as metpy
> 
> file_218 = 
> "https://www.ncei.noaa.gov/thredds/dodsC/model-nam218/202011/20201121/nam_218_20201121_0000_000.grb2";
> 
> ds218    = xr.open_dataset(file_218)
> ds218    = ds218.metpy.parse_cf()
> 
> Error Message
> ---------------------------------------------------------------------------
> NameError                                 Traceback (most recent call last)
> <ipython-input-9-4362f5b26659> in <module>()
> 9 file_218 = 
> "https://www.ncei.noaa.gov/thredds/dodsC/model-nam218/202011/20201121/nam_218_20201121_0000_000.grb2";
> 10 ds218    = xr.open_dataset(file_218)
> ---> 11 ds218    = ds218.metpy.parse_cf()
> 
> 1 frames
> /usr/local/lib/python3.6/dist-packages/metpy/xarray.py in parse_cf(self, 
> varname, coordinates)
> 510         """
> 511         from .cbook import iterable
> --> 512         from .plots.mapping import CFProjection
> 513
> 514         if varname is None:
> 
> /usr/local/lib/python3.6/dist-packages/metpy/plots/__init__.py in <module>()
> 17 logger = logging.getLogger(__name__)
> 18
> ---> 19 __all__ = ctables.__all__[:]  # pylint: disable=undefined-variable
> 20 __all__.extend(declarative.__all__)  # pylint: disable=undefined-variable
> 21 __all__.extend(skewt.__all__)  # pylint: disable=undefined-variable
> 
> NameError: name 'ctables' is not defined
> 
> Any ideas would be appreciated, I’m out of ‘em here.
> 


Ticket Details
===================
Ticket ID: MVR-694466
Department: Support Python
Priority: Low
Status: Closed
===================
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