networkx – change color/width according to edge attributes – inconsistent result

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The order of the edges passed to the drawing functions are important. If you don’t specify (using the edges keyword) you’ll get the default order of G.edges(). It is safest to explicitly give the parameter like this: 

import networkx as nx

G = nx.Graph()
G.add_edge(1,2,color="r",weight=2)
G.add_edge(2,3,color="b",weight=4)
G.add_edge(3,4,color="g",weight=6)

pos = nx.circular_layout(G)

edges = G.edges()
colors = [G[u][v]['color'] for u,v in edges]
weights = [G[u][v]['weight'] for u,v in edges]

nx.draw(G, pos, edges=edges, edge_color=colors, width=weights)

This results in an output like this:
enter image description here

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