如何使用PyGraphviz在无向图的边缘添加和显示权重?

问题描述

import pygraphviz as pgv
A = pgv.AGraph()
A.add_node('Alice')
A.add_node('Emma')
A.add_node('John')
A.add_edge('Alice', 'Emma')
A.add_edge('Alice', 'John')
A.add_edge('Emma', 'John')
print A.string()
print "Wrote simple.dot"
A.write('simple.dot')  # write to simple.dot
B = pgv.AGraph('simple.dot')  # create a new graph from file
B.layout()  # layout with default (neato)
B.draw('simple.png')  # draw png
print 'Wrote simple.png'

我想在边缘上添加权重，该权重也应该出现在图中.

I want to add weights to the edges which should also show up on the figure.

推荐答案

您可以在创建边缘时将属性添加到边缘:

You can add attributes to the edges when you create them:

A.add_edge('Alice', 'Emma', weight=5)

或者您可以稍后通过以下方式设置它们:

or you can set them later with:

edge = A.get_edge('Alice', 'Emma')
edge.attr['weight'] = 5

要将文本信息添加到边缘，请给它们一个label属性:

To add textual information to edges, give them a label attribute instead:

edge = A.get_edge('Alice', 'Emma')
edge.attr['label'] = '5'

所有属性都在内部存储为字符串，但是GraphViz会将它们解释为特定类型.请参阅属性文档.

All attributes are internally stored as strings but GraphViz interprets these as specific types; see the attribute documentation.

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