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from ete3 import Tree
tree = Tree( '(A:1,(B:1,(C:1,D:1):0.5):0.5);' )
# Prints the name of every leaf under the tree root
print("Leaf names:")
for leaf in tree.get_leaves():
print(leaf.name)
# Label nodes as terminal or internal. If internal, saves also the
# number of leaves that it contains.
print("Labeled tree:")
for node in tree.get_descendants():
if node.is_leaf():
node.add_features(ntype="terminal")
else:
node.add_features(ntype="internal", size=len(node))
# Gets the extended newick of the tree including new node features
print(tree.write(features=[]))
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