docs: def seq_seguid(seq, normalize=True):
      """returns seguid for sequence `seq`
  
      This seguid is compatible with BioPython's seguid.
  
      >>> seq_seguid('')
      '2jmj7l5rSw0yVb/vlWAYkK/YBwk'
  
      >>> seq_seguid('ACGT')
      'IQiZThf2zKn/I1KtqStlEdsHYDQ'
  
      >>> seq_seguid('acgt')
      'IQiZThf2zKn/I1KtqStlEdsHYDQ'
  
      >>> seq_seguid('acgt', normalize=False)
      'lII0AoG1/I8qKY271rgv5CFZtsU'
  
      """
      seq = normalize_sequence(seq) if normalize else seq
      bseq = seq.encode("ascii")
      return base64.b64encode(hashlib.sha1(bseq).digest()).decode("ascii").rstrip(
          '=')