I was using python's datashader 0.5.0 package to plot population density information, generally following the tutorial https://www.continuum.io/blog/developer-blog/analyzing-and-visualizing-big-data-interactively-your-laptop-datashading-2010-us . I installed datashader using conda install -c bokeh datashader=0.5.0.
All was fine. Though perhaps unrelated, things seemed to break as soon as I installed the haloviews and geoviews packages. After installing these additional packages, I can no longer import datashader and my once working code no longer runs. When importing datashader, I get the following error: AttributeError: module 'snappy' has no attribute 'compress'
I am running on windows 10, anaconda python 3.5.3.
Perhaps I'm going down the wrong rabbit hole, but I thought perhaps it was the snappy package. I ran "conda install -c conda-forge snappy=1.1.4". conda list reveals that snappy is installed. Snappy does import. The snappy.compress object is not found. My issue seems related to the following SO post as I also had a fastparquet error when trying geoviews: error with snappy while importing fastparquet in python
When running import snappy, print(snappy.__filename__) gives the following error:
---------------------------------------------------------------------------
AttributeError Traceback (most recent call last)
<ipython-input-5-b8565733b383> in <module>()
----> 1 import snappy; print(snappy.__file__)
AttributeError: module 'snappy' has no attribute '__file__'
I also tried uninstalling through both conda and pip just in case. Still no joy.
Running "pip install python-snappy" results in a "failed building wheel for python-snappy" error preceded with " error: Microsoft Visual C++ 14.0 is required..." So I went and got the "Microsoft Visual C++ Redistributable for Visual Studio 2017" and ran it, but had no change.
Any thoughts on how to resolve this? For reference, the full error on datashader import is as follows:
--------------------------------------------------------------------------
AttributeError Traceback (most recent call last)
<ipython-input-7-3d7b1ff9e530> in <module>()
----> 1 import datashader
C:\Python\lib\site-packages\datashader\__init__.py in <module>()
3 __version__ = '0.5.0'
4
----> 5 from .core import Canvas
6 from .reductions import (count, any, sum, min, max, mean, std, var, count_cat,
7 summary)
C:\Python\lib\site-packages\datashader\core.py in <module>()
3 import numpy as np
4 from datashape.predicates import istabular
----> 5 from odo import discover
6 from xarray import DataArray
7
C:\Python\lib\site-packages\odo\__init__.py in <module>()
63 from .backends.url import URL
64 with ignoring(ImportError):
---> 65 from .backends.dask import dask
66
67
C:\Python\lib\site-packages\odo\backends\dask.py in <module>()
8
9 from dask.array.core import Array, from_array
---> 10 from dask.bag.core import Bag
11 import dask.bag as db
12 from dask.compatibility import long
C:\Python\lib\site-packages\dask\bag\__init__.py in <module>()
1 from __future__ import absolute_import, division, print_function
2
----> 3 from .core import (Bag, Item, from_sequence, from_url, to_textfiles, concat,
4 from_delayed, map_partitions, bag_range as range,
5 bag_zip as zip, bag_map as map)
C:\Python\lib\site-packages\dask\bag\core.py in <module>()
30
31 from ..base import Base, normalize_token, tokenize
---> 32 from ..bytes.core import write_bytes
33 from ..compatibility import apply, urlopen
34 from ..context import _globals, defer_to_globals
C:\Python\lib\site-packages\dask\bytes\__init__.py in <module>()
2
3 from ..utils import ignoring
----> 4 from .core import read_bytes, open_files, open_text_files
5
6 from . import local
C:\Python\lib\site-packages\dask\bytes\core.py in <module>()
7 from warnings import warn
8
----> 9 from .compression import seekable_files, files as compress_files
10 from .utils import (SeekableFile, read_block, infer_compression,
11 infer_storage_options, build_name_function)
C:\Python\lib\site-packages\dask\bytes\compression.py in <module>()
30 with ignoring(ImportError):
31 import snappy
---> 32 compress['snappy'] = snappy.compress
33 decompress['snappy'] = snappy.decompress
34
AttributeError: module 'snappy' has no attribute 'compress'
It turns out that in adding packages, something messed up the snappy install. I followed this solution: How to install snappy C libraries on Windows 10 for use with python-snappy in Anaconda? It was a snappy error, not a datashader issue, but I'll leave the post in case anyone has the same series of issues.