How can I modify a node in a GP tree?

[Ben]

Hi there,

I am using STGP. Trees are represented as PrimtiveTrees.

To access a particular node in a tree I can index in as tree[5] for example.

How would I then go about modifying this node? i.e.

tree[5] = updated_value

The type of the node is a Custom class, but when extracting from the tree it is of type deap.gp.Custom.

So how can I convert my variable to this deap.gp form?

I cant use the from string method, as this is broken for custom types and lists, both of which I need

Thanks!

[Ben]

I thought this could be a workaround

new_tree = deepcopy(tree)
new_tree[5].value = ['a']

But this still changes the original "tree", rather than performing a deep copy for some reason