[Biopython] Write alignment int he fasta format

[Ahmad Khalifa]

I have :

aligner = PairwiseAligner()
alignments = aligner.align(chain1, chain2)

how to write alignments[0] as a text file containing the alignment in fasta
format. I went through the documentation below, and I'm not really sure I
follow. Do I have to save the alignments as text first, then, read it using
AlingIO then write it using SeqIO?

http://biopython.org/DIST/docs/api/Bio.AlignIO-module.html

A code snippet would be most helpful.

Regards.
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