Question

我已经从git安装了pandana：

!{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)

我正在运行以下代码：

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

我正在关注Geoff Boeing的教程：andana-accessibility-demo-full.ipynb

运行代码时，出现以下错误：

---------------------------------------------------------------------------
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__'

当我在Google中搜索时，reduce_cython错误出现了几次，但是我找不到能解决我问题的方法。到目前为止，我已经尝试更新cython和numpy，当遇到相关问题时，它们似乎已对其他人有用：

!{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)

我也尝试过使用conda下载，这似乎也对某些人有用：

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

不幸的是，这并没有为我解决错误。

希望有人能阐明一些想法吗？

非常感谢您的帮助！

Answer 1

感谢@DavidW。这是我所做的，并且可以解决问题：

首先，由于我使用的是Collaboratory，因此我刚刚重新启动了会话以卸载pandana。

然后我升级了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

只有那时，我安装了pandana：

!{sys.executable} -m pip install pandana

现在工作正常。

所以@ead到this github-issue的链接似乎很有意义。 cython实现的程序包是从不正确的Cython版本开始构建的。必须先卸载，然后再升级Cython，然后才能安装pandana。

AttributeError：类型对象'pandana.cyaccess.cyaccess'没有属性'__reduce_cython __'

1 个答案: