from ete3 import Tree
# Loads a tree structure from a newick string. The returned variable
# 't' is the root node for the tree.
t = Tree('(A:1,(B:1,(E:1,D:1):0.5):0.5);' )
# Load a tree structure from a newick file.
t = Tree('genes_tree.nh')
# You can also specify the newick format. For instance, for named
# internal nodes we will format 1.
t = Tree('(A:1,(B:1,(E:1,D:1)Internal_1:0.5)Internal_2:0.5)Root;', format=1)