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src/b/i/biopython-1.63/Bio/Seq.py   biopython(Download)
    else:
        #Assume the worst case, ambiguous DNA or RNA:
        valid_letters = set(IUPAC.ambiguous_dna.letters.upper() +
                            IUPAC.ambiguous_rna.letters.upper())
    n = len(sequence)

src/b/i/biopython-HEAD/Bio/Seq.py   biopython(Download)
    else:
        #Assume the worst case, ambiguous DNA or RNA:
        valid_letters = set(IUPAC.ambiguous_dna.letters.upper() +
                            IUPAC.ambiguous_rna.letters.upper())
    n = len(sequence)