How to convert tuple to extended Newick format in ETE3 (python)?

Question

[hazelle64]

I have built a tree in Python using ETE3 package. Now I need to convert to extended Newick format, ideally using the same package.

Can anybody help me out?

[Ram]

What have you tried? Have you tried googling with appropriate keywords and limiting results to biostars ( https://www.google.com/search?q=convert+tree+newick+ete3+site%3Abiostars.org )

[jhc]

ete3 returns trees in newick (.nw) and extended newick (.nwx) format.