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S.lower() -> string

Return a copy of the string S converted to lowercase.

src/h/e/helperlibs-0.1.4/helperlibs/bio/seqio.py   helperlibs(Download)
    all_valid = set(string.digits)
    all_valid.update(set(iupac.protein_letters.lower()))
    all_valid.update(set(iupac.unambiguous_dna_letters.lower()))
    all_valid.update(set('- \n'))
    if all_valid.issuperset(all_input_letters):