PyGraphistry Tutorial



In [5]:

    
import pandas
import graphistry
graphistry.register(key='Email pygraphistry@graphistry.com to get your API key')



In [6]:

    
# Parse CSV using Pandas
links = pandas.read_csv('./lesmiserables.csv') ### FIX PATH



In [7]:

    
# Let's have a peak at our data by printing the first three rows
links[:3]









    Out[7]:






  
    
      
      source
      target
      value
    
  
  
    
      0
      Napoleon
      Myriel
      1
    
    
      1
      Mlle.Baptistine
      Myriel
      8
    
    
      2
      Mme.Magloire
      Myriel
      10



In [8]:

    
# Plot graph using the source/target columns as source/destination of edges
plotter = graphistry.bind(source='source', destination='target')
plotter.plot(links)









    Out[8]:



In [9]:

    
# New graph adding the number of encounters to edge labels.
links['label'] = links.value.map(lambda v: 'Num. Encounters: %d' % v)
plotter = plotter.bind(edge_label='label')
plotter.plot(links)









    Out[9]:

Controling Node Size and Color

We are going to use Igraph to color nodes by community and size them using pagerank. To install igraph, use pip install python-igraph



In [10]:

    
# Convert our graph from Pandas to Igraph
import igraph
ig = plotter.pandas2igraph(links)
igraph.summary(ig)









    



IGRAPH D--- 77 254 -- 
+ attr: __nodeid__ (v), label (e), value (e)






    



WARNING: "node" is unbound, automatically binding it to "__nodeid__".



In [11]:

    
# We create two node attributes for pagerank and community
ig.vs['pagerank'] = ig.pagerank()
ig.vs['community'] = ig.community_infomap().membership 
igraph.summary(ig)









    



IGRAPH D--- 77 254 -- 
+ attr: __nodeid__ (v), community (v), pagerank (v), label (e), value (e)



In [12]:

    
# The plotter can plot Igraph directly
plotter.bind(point_color='community', point_size='pagerank').plot(ig)









    Out[12]:



In [ ]:

	source	target	value
0	Napoleon	Myriel	1
1	Mlle.Baptistine	Myriel	8
2	Mme.Magloire	Myriel	10