Skip to main content

A simple .gexf parser/writer for python

Project description

# Simple GEXF
A simple `.gexf` parser / writer for python

**Notice:** This is currently work in progress, and I hope to be able to create documentation in the future when I've settled on the overall structure.

## Motivation:
The official [`pygexf`](https://github.com/paulgirard/pygexf) is poorly maintained and almost not documented at all. I needed a simple abstraction layer for the `XML` format for my project.
This project uses [`xmltodict`](https://github.com/martinblech/xmltodict), which means it's much easier to understand and debug than `pygexf` which uses `lxml`.
This is a tool for those who'd rather spend their time learning about something more interesting and worthwhile than `XML`.


## Usage:

~~~python
from simplegexf import Gexf, Edge

gexf = Gexf('tags.gexf')

try:
graph = gexf.graphs[0]
except IndexError:
graph = gexf.add_graph(defaultedgetype="directed")

# Define Graph attributes
graph.define_attributes([
('description', 'string'),
('count', 'integer'),
])

# Define Edge attributes for Graph
graph.define_attributes([
('relation_type', 'string'),
], _class='edge')

nodes = {node.id: node for node in graph.nodes}

tags = [
{
id: 0,
name: 'Test tag 1',
description: 'This is a test tag',
},
{
id: 1,
name: 'Test tag 2',
description: 'This is a test tag',
parents: [0],
},
{
id: 2,
name: 'Test tag 3',
description: 'This is a test tag',
parents: [0, 1],
}
]

# Create nodes for tags:
for tag in tags:
try:
# See if node exists:
node = nodes[str(tag['id'])]
except KeyError:
# Create a new node:
node = self.graph.add_node(id=str(tag['id']), label=tag['name'])

# Update node:
node.set('viz:size', value=10.0)
node.set('viz:color', r=130, g=130, b=130)

# Update node attributes:
for attr in self.graph.node_attributes.keys():
try:
node.attributes[attr] = tag[attr]
except KeyError:
try:
del node.attributes[attr]
except IndexError:
pass

nodes = {node.id: node for node in graph.nodes}

# Create edges for tags:
for tag in tags:
try:
for parent_id in tag['parents']:
edge = Edge(parent_id, tag['id'])
graph.edges.append(edge)
# Attributes are not available before adding edge to graph
edge.attributes['relation_type'] = 'parents'
except KeyError:
pass

graph.sort_nodes(attr='count', reverse=True)

gexf.write()
~~~

Project details


Supported by

AWS AWS Cloud computing and Security Sponsor Datadog Datadog Monitoring Fastly Fastly CDN Google Google Download Analytics Microsoft Microsoft PSF Sponsor Pingdom Pingdom Monitoring Sentry Sentry Error logging StatusPage StatusPage Status page