Displaying tree with attributes as Image with ETE3

Question

[moranr]

Hi,

I want to print a tree with selected attributes using ete3 in python using a Newick (with NHX annotations) file e.g. :

(dog[&&NHX:Genes=3:Identical=3:Duplicated=0:Lost=0:Novel=0:Singleton=0], ((mouse2[&&NHX:Genes=19:Identical=19:Duplicated=0:Lost=0:Novel=0:Singleton=0], mouse[&&NHX:Genes=21:Identical=17:Duplicated=4:Lost=0:Novel=0:Singleton=0])mouse_mouse2[&&NHX:Genes=19:Identical=9:Duplicated=0:Lost=1:Novel=10:Singleton=0], human[&&NHX:Genes=9:Identical=9:Duplicated=0:Lost=1:Novel=0:Singleton=0])"human/mouse/mouse2"[&&NHX:Genes=10:Identical=3:Duplicated=0:Lost=0:Novel=7:Singleton=0])LUCA[&&NHX:Genes=3];

I can print an ascii tree like so:

    /-dog, 3, 0, 0, 0
   |
-LUCA                                           /-mouse2, 19, 0, 0, 0
   |                              /mouse_mouse2, 9, 0, 1, 0
    \"human/mouse/mouse2", 3, 0, 0, 0           \-mouse, 17, 4, 0, 0
                                  |
                                   \-human, 9, 0, 1, 0

Is there a way to do this as a phylogenetic tree image e.g. using the TreeStyle() function?

Thanks.

Answer 1

[jhc]

Yes, each graphical feature associated to a node is called a Node Face. You can add any number of faces to each node, and you can control de position of each face relative to its node. Then call the tree.render(...) function to get an image. There are many type of faces and parameters to customize the image, check this part of the tutorial

A very simple example would like this:

from ete3 import Tree, TextFace, AttrFace
tree = Tree("((A, B), C);")
nodeA = tree & ("A")
nodeAB = tree.get_common_ancestor("A", "B")
nodeA.add_face(TextFace("mouse"), column=1, position="branch-right")
nodeA.add_face(TextFace("/human"), column=2, position="branch-right")
nodeAB.add_face(TextFace("mouse"), column=0, position="branch-top")
nodeAB.add_face(TextFace("/mouse"), column=1, position="branch-top")
nodeAB.add_face(AttrFace("dist", text_prefix="/"), column=2, position="branch-top")
tree.render("tree.png")

[moranr]

Thanks, I do think this is a good place to start and it answers my question.

However, a problem: How can this be done iteratively for a very big tree. I want to display this at each node of the tree.

Can I simply just recurse over each node and at that node say n.add_face(AttrFace("dist", text_prefix="/"), column=2, position="branch-top")?

Thanks,

[jhc]

yes, iter over nodes and add as many faces as you want. Faces in the same column will be stacked.

[moranr]

Great, thank you.

[O.rka]

@jhc can you take a look at this if you get a chance: http://stackoverflow.com/questions/39380907/how-to-color-leaves-on-ete3-tree-python-3

[jhc]

check answer her: http://stackoverflow.com/a/39409340/255832