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  3. Introduction to Network Analysis in Python

Exercise

Specifying a weight on edges

Weights can be added to edges in a graph, typically indicating the "strength" of an edge. In NetworkX, the weight is indicated by the 'weight' key in the metadata dictionary.

Before attempting the exercise, use the IPython Shell to access the dictionary metadata of T and explore it, for instance by running the commands T.edges[1, 10] and then T.edges[10, 1]. Note how there's only one field, and now you're going to add another field, called 'weight'.

Instructions

100 XP
  • Set the 'weight' attribute of the edge between node 1 and 10 of T to be equal to 2. Refer to the following template to set an attribute of an edge: network_name.edges[node1, node2]['attribute'] = value. Here, the 'attribute' is 'weight'.
  • Set the weight of every edge involving node 293 to be equal to 1.1. To do this:
    • Using a for loop, iterate over all the edges of T, including the metadata.
    • If 293 is involved in the list of nodes [u, v]:
      • Set the weight of the edge between u and v to be 1.1.