Convert `GetConnections.sources()` to iterator of NodeCollections?

[stinebuu]

For SynapseCollection we have two ways of getting the source and target node ids: conns.source and conns.sources() in the snippet below

E = nest.Create('aeif_cond_exp',2)
I = nest.Create('aeif_cond_exp',2)
nest.Connect(E,I)

conns = nest.GetConnections()
s = conns.source          # returns a list of node ids
s_iter = conns.sources()  # returns an iterator, iterating over node ids

Both return node id's, but as we are using NodeCollection everywhere now, we should think about changing conns.sources() and conns.targets() to instead be iterators returning the source and target NodeCollections. As sources and targets most often are not unique, we cannot return a NodeCollection iterator directly, but we can create our own iterator that converts the node id to a NodeCollection and returns it.

This first came up in this mailing list question.

[github-actions]

Issue automatically marked stale!