我使用python的datashader 0.5.0包来绘制人口密度信息，通常遵循教程https://www.continuum.io/blog/developer-blog/analyzing-and-visualizing-big-data-interactively-your-laptop -datashading-2010-us。我使用conda install -c bokeh datashader=0.5.0.
一切都很好。尽管可能不相关，但一旦我安装了 haloviews 和 geoviews 软件包，事情似乎就崩溃了。安装这些附加软件包后，我无法再导入数据着色器，并且我曾经工作的代码不再运行。导入数据着色器时，出现以下错误： AttributeError: module 'snappy' has no attribute 'compress'
我在 Windows 10、anaconda python 3.5.3 上运行。
也许我走错了兔子洞，但我想也许是时髦的包裹。我跑了“conda install -c conda-forge snappy=1.1.4”。conda list 显示已安装 snappy。Snappy 确实导入了。找不到 snappy.compress 对象。我的问题似乎与以下 SO 帖子有关，因为我在尝试 geoviews 时也遇到了 fastparquet 错误：在 python 中导入 fastparquet时出现 snappy 错误
运行时import snappy，print(snappy.__filename__)出现以下错误：
---------------------------------------------------------------------------
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__'
为了以防万一，我还尝试通过 conda 和 pip 卸载。仍然没有喜悦。
运行“pip install python-snappy”会导致“python-snappy 的构建轮失败”错误，前面有“错误：需要 Microsoft Visual C++ 14.0...”所以我去获取“Microsoft Visual C++ Redistributable for Visual Studio 2017”并运行它，但没有任何变化。
关于如何解决这个问题的任何想法？作为参考，datashader导入的完整错误如下：
--------------------------------------------------------------------------
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'