AttributeError：類型 object 'pandana.cyaccess.cyaccess' 沒有屬性 '__reduce_cython__'

Question

我已經從 git 安裝了熊貓：

.{sys:executable} -m pip install git+git.//github.com/udst/pandana.git

在我的 jupyterlab 上：

/home/jupyterlab/conda/envs/python/lib/python3.6/site-packages (from fiona->geopandas>=0.2.1->osmnet>=0.1.2->pandana) (7.0)

我正在運行這段代碼：

import pandana, time, os, pandas as pd, numpy as np
from pandana.loaders import osm

# define your selected amenities and bounding box
# configure search at a max distance of 1 km for up to the 10 nearest points-of-interest
amenities = ['restaurant', 'bar', 'food']
distance = 1000
num_pois = 10
num_categories = len(amenities) + 1 #one for each amenity, plus one extra for all of them combined

# bounding box as a list of llcrnrlat, llcrnrlng, urcrnrlat, urcrnrlng
# Bounding box for a Edinburgh, Scotland
west, south, east, north = (-3.449533, 55.818792, -3.074951, 56.004084)
bbox = [west, south, east, north] #lat-long bounding box for Edinburgh, Scotland

我正在關注這個 Geoff Boeing 的教程：andana-accessibility-demo-full.ipynb

當我運行代碼時，出現以下錯誤：

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-183-27bb5991aaa3> in <module>
----> 1 import pandana, time, os, pandas as pd, numpy as np
      2 from pandana.loaders import osm
      3 
      4 # define your selected amenities and bounding box
      5 # configure search at a max distance of 1 km for up to the 10 nearest points-of-interest

~/conda/envs/python/lib/python3.6/site-packages/pandana/__init__.py in <module>
----> 1 from .network import Network
      2 
      3 version = __version__ = '0.4.4'

~/conda/envs/python/lib/python3.6/site-packages/pandana/network.py in <module>
      9 from sklearn.neighbors import KDTree
     10 
---> 11 from .cyaccess import cyaccess
     12 from .loaders import pandash5 as ph5
     13 import warnings

src/cyaccess.pyx in init pandana.cyaccess()

AttributeError: type object 'pandana.cyaccess.cyaccess' has no attribute '__reduce_cython__'

當我在 Google 中搜索時， reduce_cython錯誤出現了幾次，但我找不到可以解決我的問題的東西。 到目前為止，我已經嘗試更新 cython 和 numpy，這在面臨相關問題時似乎對其他人有用：

!{sys.executable} -m pip install --upgrade cython
# Output: Requirement already up-to-date: cython in /home/jupyterlab/conda/envs/python/lib/python3.6/site-packages (0.29.13)

!{sys.executable} -m pip install --upgrade numpy
# Output: Requirement already up-to-date: numpy in /home/jupyterlab/conda/envs/python/lib/python3.6/site-packages (1.17.2)

我也嘗試過使用 conda 下載，這似乎也適用於某些人：

# Install a conda package in the current Jupyter kernel
import sys
!conda install --yes --prefix {sys.prefix} pandana

不幸的是，這並沒有解決我的錯誤。

希望任何人都可以有所啟發？

非常感謝你的幫助！

Answer 1

謝謝@DavidW。 這是我所做的，它解決了問題：

首先，由於我使用的是 Collaboratory，我剛剛重新啟動了我的 session 以卸載 Pandana。

然后我升級了 Cython：

import sys
!{sys.executable} -m pip install --upgrade cython

# Output: 
Collecting cython
  Downloading https://files.pythonhosted.org/packages/45/f2/a7101b3457561e57f5abcd6f5ac13190054fecd7370f58f36fe2d6574742/Cython-0.29.13-cp36-cp36m-manylinux1_x86_64.whl (2.1MB)
     |████████████████████████████████| 2.1MB 1.9MB/s eta 0:00:01
Installing collected packages: cython
Successfully installed cython-0.29.13 

只有這樣，我才安裝了 pandana：

!{sys.executable} -m pip install pandana

現在工作得很好。

所以看來@ead 到這個 github-issue的鏈接是有道理的。 cython 實現的 package 一開始就使用不正確的 Cython 版本構建。 必須卸載，然后升級 Cython，然后才能安裝 Pandana。