Install works ok, failure importing (Cartopy 0.13, Python 3)

[ispmarin]

cartopy installs correctly using pip, but when importing I get the following stack trace:

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-5-701c7294a873> in <module>()
      4 import matplotlib
      5 import matplotlib.pyplot as plt
----> 6 import cartopy

/home/user/.virtualenvs/maps/lib/python3.4/site-packages/cartopy/__init__.py in <module>()
    109 # convenience.
    110 import cartopy.crs
--> 111 import cartopy.feature

/home/user/.virtualenvs/maps/lib/python3.4/site-packages/cartopy/feature.py in <module>()
     30 import six
     31 
---> 32 from cartopy.io.ogc_clients import WFSGeometrySource
     33 import cartopy.io.shapereader as shapereader
     34 import cartopy.crs

/home/user/.virtualenvs/maps/lib/python3.4/site-packages/cartopy/io/ogc_clients.py in <module>()
     55     _OWSLIB_AVAILABLE = False
     56 
---> 57 import cartopy.crs as ccrs
     58 from cartopy.io import LocatedImage, RasterSource
     59 from cartopy.img_transform import warp_array

AttributeError: 'module' object has no attribute 'crs'

On a Ubuntu 14.04 install, with libproj-dev version 4.8.0-2ubuntu2 and libgdal version 1.10.1+dfsg-5ubuntu1.

[ispmarin]

Now a different error if I try to import cartopy directly:

---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
<ipython-input-1-701c7294a873> in <module>()
      4 import matplotlib
      5 import matplotlib.pyplot as plt
----> 6 import cartopy

/home/user/.virtualenvs/maps/lib/python3.4/site-packages/cartopy/__init__.py in <module>()
    109 # convenience.
    110 import cartopy.crs
--> 111 import cartopy.feature

/home/user/.virtualenvs/maps/lib/python3.4/site-packages/cartopy/feature.py in <module>()
     30 import six
     31 
---> 32 from cartopy.io.ogc_clients import WFSGeometrySource
     33 import cartopy.io.shapereader as shapereader
     34 import cartopy.crs

/home/user/.virtualenvs/maps/lib/python3.4/site-packages/cartopy/io/ogc_clients.py in <module>()
     57 import cartopy.crs as ccrs
     58 from cartopy.io import LocatedImage, RasterSource
---> 59 from cartopy.img_transform import warp_array
     60 
     61 

/home/user/.virtualenvs/maps/lib/python3.4/site-packages/cartopy/img_transform.py in <module>()
     24 
     25 import numpy as np
---> 26 import scipy.spatial
     27 
     28 import cartopy.crs as ccrs

ImportError: No module named 'scipy'

[QuLogic]

Since you want to do some plotting, you should use the plotting extra mode for installation: pip install cartopy[plotting], which should get you the other dependencies.

However, SciPy is a pain to build, so it would be best if you install it from your package manager sudo apt-get install python3-scipy.

[ispmarin]

Well, this is not very clear from the docs when installing cartopy.
I suggest that the logic should be inverted: doing a pip install cartopy should install all that is needed to do a import cartopy without failures. If that needs plotting or other things they should be dependencies.

Actually, Scipy is quite easy to install with pip, only requiring BLAS/LAPACK, FFT and a Fortran compiler. As I want to use virtualenvs and keep each env independent I tend to not install system packages except python itself.

[QuLogic]

Yes, sorry, I forgot to mention that that is a known bug. The default install should not depend on any of the plotting-related libraries and will be fixed in 0.14.

[ispmarin]

Thanks!

[efiring]

@QuLogic, was this fixed in 0.14 as you predicted? If so, this can be closed, correct?

[btengels]

Same problem. I've installed from source and from conda and get the same result. My error is slightly different but it still installs w/out any error and then fails on import. Is 0.14 a dev version?

In [1]: import cartopy
---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
<ipython-input-1-8327782196fd> in <module>()
----> 1 import cartopy

/Users/btengels/anaconda3/lib/python3.5/site-packages/cartopy/__init__.py in <module>()
    108 # Commonly used sub-modules. Imported here to provide end-user
    109 # convenience.
--> 110 import cartopy.crs
    111 import cartopy.feature

/Users/btengels/anaconda3/lib/python3.5/site-packages/cartopy/crs.py in <module>()
     35 import six
     36 
---> 37 from cartopy._crs import CRS, Geocentric, Geodetic, Globe, PROJ4_RELEASE
     38 import cartopy.trace
     39 

ImportError: dlopen(/Users/btengels/anaconda3/lib/python3.5/site-packages/cartopy/_crs.cpython-35m-darwin.so, 2): Library not loaded: @rpath/./libproj.9.dylib
  Referenced from: /Users/btengels/anaconda3/lib/python3.5/site-packages/cartopy/_crs.cpython- 35m-darwin.so
  Reason: image not found

Update:
Nearly the same error after deleting/reinstalling proj4 libproj files (version 4.9) and doing the same with cartopy (version 0.14 from source). Everything is identical up to the ImportError:

ImportError: dlopen(/Users/btengels/anaconda3/lib/python3.5/site-packages/Cartopy-0.14.0-py3.5-macosx-10.5-x86_64.egg/cartopy/_crs.cpython-35m-darwin.so, 2): Library not loaded: @rpath/libproj.12.dylib
  Referenced from: /Users/btengels/anaconda3/lib/python3.5/site-packages/Cartopy-0.14.0-py3.5-macosx-10.5-x86_64.egg/cartopy/_crs.cpython-35m-darwin.so
  Reason: image not found