AttributeError：“元组”对象没有属性“low_connectivity_nodes”答案

【问题标题】：AttributeError: 'tuple' object has no attribute 'low_connectivity_nodes'AttributeError：“元组”对象没有属性“low_connectivity_nodes”
【发布时间】：2017-12-07 20:46:33
【问题描述】：

我正在尝试关注“Pandana 网络可访问性演示”Github 存储库 (https://github.com/gboeing/urban-data-science/blob/2017/20-Accessibility-Walkability/pandana-accessibility-demo-full.ipynb)。

到目前为止，复制和粘贴代码时一切正常，但运行时出现问题：

start_time = time.time()
if os.path.isfile(net_filename):
    # if a street network file already exists, just load the dataset from that
    network = pandana.network.Network.from_hdf5(net_filename)
    method = 'loaded from HDF5'
else:
    # otherwise, query the OSM API for the street network within the specified bounding box
    network = osm.network_from_bbox(bbox[0], bbox[1], bbox[2], bbox[3])
    method = 'downloaded from OSM'
    
    # identify nodes that are connected to fewer than some threshold of other nodes within a given distance
    lcn = network.low_connectivity_nodes(impedance=1000, count=10, imp_name='distance')
    network.save_hdf5(net_filename, rm_nodes=lcn) #remove low-connectivity nodes and save to h5
    
print('Network with {:,} nodes {} in {:,.2f} secs'.format(len(network.node_ids), method, time.time()-start_time))

这是我得到的错误：

AttributeError                            Traceback (most recent call last)
<ipython-input-7-693cbbc8dc72> in <module>()
     10 
     11     # identify nodes that are connected to fewer than some threshold of other nodes within a given distance
---> 12     lcn = network.low_connectivity_nodes(impedance=1000, count=10, imp_name='distance')
     13     network.save_hdf5(net_filename, rm_nodes=lcn) #remove low-connectivity nodes and save to h5
     14 

AttributeError: 'tuple' object has no attribute 'low_connectivity_nodes'

【问题讨论】：

正如它所说的：network 是一个元组（Python 预定义的数据类型）。元组没有这样的方法。我们不能做更多，因为您没有提供Minimal, complete, verifiable example，而且我们不知道什么数据类型会有这样的方法，或者你认为你是如何进入的network.
笔记本使用 pandana (v0.2) 从 OpenStreetMap API (OSM API) 下载街道网络和兴趣点 (POI) 数据，然后计算兴趣点的网络可访问性。如果有人可以帮助我，我将链接附加到问题中的回购。

标签： python python-2.7 attributes tuples

【解决方案1】：

您可以通过以下操作解决此错误

network = osm.network_from_bbox(bbox[0], bbox[1], bbox[2], bbox[3])
network=pandana.Network(network[0]["x"],network[0]["y"], network[1]["from"], network[1]["to"],
                 network[1][["distance"]])
lcn = network.low_connectivity_nodes(impedance=1000, count=10, imp_name='distance')
network.save_hdf5(net_filename, rm_nodes=lcn) #remove low-connectivity nodes and save to h5

【讨论】：