Petr Svarny svarnypetr

Exporting a Networkx graph as a Cypher query

This little project defines a function that can be used to construct a Cypher query which when executed against a Neo4j database server will store the graph to the server.

Background

A Graph is an abstract mathematical model composed of Nodes connected through Edges that can be used to describe complex systems composed of a set of parts (corresponding to nodes) and their connections (corresponding to edges).
Examples of graphs are road networks (junctions connected via roads), electronic circuit networks (components and their connections) and others
Networkx is an excellent Python module for manipulating such Graph objects of any kind.
Neo4j is a graph database. It uses the Graph as a data model to store such objects to a data store.

	#!/bin/bash

	:'
	If you have multiple rosbags each in its own folder and need to extract some experimental data from them.
	The gist shows how to run processing scripts that are part of a ROS package and also export some ROS topics.
	A workspace needs to be sourced before this script is ran!
	'
	ROS_PACKAGE=your_ros_package

	roscore &

	from os import listdir, rename, makedirs
	from os.path import isfile, isdir, join
	from pdfminer.pdfparser import PDFParser
	from pdfminer.pdfdocument import PDFDocument

	files_path = r'media/files/'
	pdf_list = [f for f in listdir(files_path) if (isfile(join(files_path, f)) and '.pdf' in f)]
	video_list = [f for f in listdir(files_path) if (isfile(join(files_path, f)) and '.VI.mp4' in f)]
	converted_dir_name = 'converted'
	converted_dir_path = converted_dir_name + '/'

	def get_siblings(aGraph, aNode):
	"""
	Get siblings of aNode in aGraph.
	:param: aNode: {str}
	:param: aGraph: {networkx.DiGraph}
	:return: {list}
	"""
	try:
	parentEdge = [(u,v,d) for u,v,d in aGraph.edges(data=True)
	if v == aNode ]