在短划线/绘图中显示属性会导致KeyError

Question

我正在尝试可视化文档中的引用。为此，我有Elements.csv，它看起来像这样：

Doc,Description,DocumentID
SOP Laboratory,This SOP should be used in the lab,10414
Visual Design,Basics for Visual Design,1200139348
GMP,Good Manufacturing Practises,4638261
Windows PC manual,This manual describes how to use Windows PCs,271922

在Connections.csv中，我有参考文献：

Source,Target
SOP Laboratory,Windows PC manual
SOP Laboratory,GMP
Visual Design,Windows PC manual

即SOP Laboratory中有一个参考，指向Windows PC manual等

我用来可视化这个网络的代码与Dash/Plotly:一起工作

import pandas as pd
import networkx as nx
import plotly.graph_objs as go
import plotly
import dash
import dash_core_components as dcc
import dash_html_components as html
## Dash setup
external_stylesheets = ['https://codepen.io/chriddyp/pen/bWLwgP.css']
app = dash.Dash(__name__, external_stylesheets=external_stylesheets)

## Data
edges = pd.read_csv('Connections.csv', encoding="utf8")
nodes = pd.read_csv('Elements.csv', encoding="utf8")

## Graph
G = nx.from_pandas_edgelist(edges, 'Source', 'Target')
nx.set_node_attributes(G, nodes.set_index('Doc')['Description'].to_dict(), 'Description')
nx.set_node_attributes(G, nodes.set_index('Doc')['DocumentID'].to_dict(), 'DocumentID')
pos = nx.spring_layout(G)
for node in G.nodes:
G.nodes[node]['pos'] = list(pos[node])
traceRecode = []
index = 0
for edge in G.edges:
x0, y0 = G.nodes[edge[0]]['pos']
x1, y1 = G.nodes[edge[1]]['pos']
trace = go.Scatter(x=tuple([x0, x1, None]), y=tuple([y0, y1, None]),
mode='lines',
hoverinfo='none',
line={'width': 2},
marker=dict(color='#000000'),
line_shape='spline',
opacity=1)
traceRecode.append(trace)
index = index + 1
node_trace = go.Scatter(
x=[],
y=[],
hovertext=[],
text=[],
mode='markers+text',
textposition="bottom center",
hoverinfo='text',
marker=dict(
showscale=True,
colorscale='Agsunset',
reversescale=True,
color=[],
size=20,
colorbar=dict(
thickness=15,
title='Node Connections',
xanchor='left',
titleside='right'
),
line=dict(width=0)))
index = 0
for node in G.nodes():
x, y = G.nodes[node]['pos']
# hovertext = "Document Name: " + str(G.nodes[node]['Doc']) + "<br>" + "Document ID: " + str(G.nodes[node]['DocumentID'])
# text = nodes['Doc'][index]
node_trace['x'] += tuple([x])
node_trace['y'] += tuple([y])
# node_trace['hovertext'] += tuple([hovertext])
# node_trace['text'] += tuple([text])
index = index + 1
for node, adjacencies in enumerate(G.adjacency()):
node_trace['marker']['color']+=tuple([len(adjacencies[1])])
node_info = adjacencies[0] #+ ' (' +str(adjacencies[1]) + ')' #+' (' +str(len(adjacencies[1])) + ' connections)'
node_trace['text']+=tuple([node_info])
traceRecode.append(node_trace)
figure = {
"data": traceRecode,
"layout": go.Layout(title='Document Overview', showlegend=False, hovermode='closest',
margin={'b': 40, 'l': 40, 'r': 40, 't': 40},
xaxis={'showgrid': False, 'zeroline': False, 'showticklabels': False},
yaxis={'showgrid': False, 'zeroline': False, 'showticklabels': False},
height=1000,
clickmode='event+select',
annotations=[
dict(
ax=(G.nodes[edge[0]]['pos'][0] + G.nodes[edge[1]]['pos'][0]) / 2,
ay=(G.nodes[edge[0]]['pos'][1] + G.nodes[edge[1]]['pos'][1]) / 2, axref='x', ayref='y',
x=(G.nodes[edge[1]]['pos'][0] * 3 + G.nodes[edge[0]]['pos'][0]) / 4,
y=(G.nodes[edge[1]]['pos'][1] * 3 + G.nodes[edge[0]]['pos'][1]) / 4, xref='x', yref='y',
showarrow=True,
arrowhead=4,
arrowsize=2,
arrowwidth=1,
opacity=1
) for edge in G.edges]
)}
app.layout = html.Div([
dcc.Graph(figure=figure
),
])
if __name__ == '__main__':
app.run_server(debug=True)

我从这个Github repo中找到了这段代码。

这导致：箭头错误

然而，错误的方向是错误的。(正确方向请参见红色箭头。(

我想要实现的是(Github repo中的"Bob"one_answers"Type1"(，即在悬停在节点上时显示文档名称、描述和ID：目标属性

然而，当我评论行出来时，就像这个

index = 0
for node in G.nodes():
x, y = G.nodes[node]['pos']
hovertext = "Document Name: " + str(G.nodes[node]['Doc']) + "<br>" + "Document ID: " + str(G.nodes[node]['DocumentID'])
text = nodes['Doc'][index]
node_trace['x'] += tuple([x])
node_trace['y'] += tuple([y])
node_trace['hovertext'] += tuple([hovertext])
node_trace['text'] += tuple([text])
index = index + 1
# for node, adjacencies in enumerate(G.adjacency()):
#     node_trace['marker']['color']+=tuple([len(adjacencies[1])])
#     node_info = adjacencies[0] #+ ' (' +str(adjacencies[1]) + ')' #+' (' +str(len(adjacencies[1])) + ' connections)'
#     node_trace['text']+=tuple([node_info])

然而，这会导致一个错误：

Traceback (most recent call last):
File "C:UsersrothstemDesktopLearnDashStackEXapp.py", line 73, in <module>
hovertext = "Document Name: " + str(G.nodes[node]['Doc']) + "<br>" + "Document ID: " + str(G.nodes[node]['DocumentID'])
KeyError: 'Doc'

我不太理解，因为'Doc'是上面定义的。

Answer 1

在图形创建过程中，您创建了节点属性"Description":

nx.set_node_attributes(G, nodes.set_index('Doc')['Description'].to_dict(), 'Description')

因此，您只需将"Doc"替换为"Description":

hovertext = "Document Name: " + str(G.nodes[node]['Description']) + "<br>" + "Document ID: " + str(G.nodes[node]['DocumentID'])