[Biopython] Alphabet question

[Sebastian Bassi]

On Tue, May 11, 2010 at 8:34 PM, Eric Talevich <eric.talevich at gmail.com> wrote:
> The IUPAC.unambiguous_dna object is a copy of IUPACUnambiguousDNA(), already
> instantiated. It shows up in the source code of Bio/Alphabet/IUPAC.py as:
> unambiguous_dna = IUPACUnambiguousDNA()

Yes, I saw the code, but I wonder why.
I think Peter addressed this point. Thank you!