Select network nodes with a given attribute value
Python <= 2.7:
According to the documentation try:
nodesAt5 = filter(lambda (n, d): d['at'] == 5, P.nodes(data=True))
or like your approach
nodesAt5 = []
for (p, d) in P.nodes(data=True):
if d['at'] == 5:
nodesAt5.append(p)
Python 2.7 and 3:
nodesAt5 = [x for x,y in P.nodes(data=True) if y['at']==5]
Sample code if someone is stuck
import networkx as nx
P=nx.Graph()
P.add_node('node1',at=5)
P.add_node('node2',at=5)
P.add_node('node3',at=6)
# You can select like this
selected_data = dict( (n,d['at']) for n,d in P.nodes().items() if d['at'] == 5)
# Then do what you want to do with selected_data
print(f'Node found : {len (selected_data)} : {selected_data}')