[Biopython] Bio.Phylo: writing newick trees with internal node names

[Tanya Golubchik]

Dear all,

I may be missing something in the documentation, but I can't seem to
figure out how to write newick trees with internal node names (preserved
as plain text). I think in some versions of Bio.Phylo a call to
tree.format('newick') accomplished this by default, but currently I
can't replicate this behaviour and get a tree with unnamed internal nodes.

Any pointers would be appreciated!

Thanks
Tanya