Inconsistent existence of coordinate systems in node attributes

[kevinchern]

Graph node attributes contain inconsistent node attributes depending on initialization.
This makes downstream code unnecessarily complex and unreliable

Example:

import dwave_networkx as dnx

P = dnx.pegasus_graph(6, coordinates=False)
print(P.nodes[20])

P = dnx.pegasus_graph(6, coordinates=True)
print(P.nodes[0, 0, 4, 0])

P = dnx.pegasus_graph(6, nice_coordinates=True)
print(P.nodes[0, 0, 0, 0, 0])

outputs

{'pegasus_index': (0, 0, 4, 0)}
{'linear_index': 20}
{'linear_index': 20, 'pegasus_index': (0, 0, 4, 0)}

[mahdiehmalekian]

FWIW, the issue exists with Zephyr as well:

import dwave_networkx as dnx

Z = dnx.zephyr_graph(6, coordinates=False)
print(Z.nodes[20])

Z = dnx.zephyr_graph(6, coordinates=True)
print(Z.nodes[0, 0, 1, 1, 2])

outputs

{'zephyr_index': (0, 0, 1, 1, 2)}
{'linear_index': 20}