Save the phylogenetic tree drawn by Bio.Phylo's draw_ascii function in text format

Since the phylogenetic tree obtained by the draw_ascii function of Biopython was not the return value but the standard output, a memo about how to save it in text format.

from Bio import Phylo
import sys

f = open("output.txt","w")
sys.stdout = f

tree = Phylo.read("****.dnd", "newick")
Phylo.draw_ascii(tree)

sys.stdout.close()

I can't think of any particular advantage in preserving the phylogenetic tree drawn in ASCII art ...