code: def find_seq_rec(block, name, case_sensitive=True):
      
      if case_sensitive:
          def test(name, rec):
              return name in rec['id']
      else:
          def test(name, rec):
              return name.upper() in rec['id'].upper()
  
      for rec in block['sequences']:
          if test(name, rec):
              return rec
      raise ValueError("No sequence ID matches %s" % repr(name))
docs: Given part of a sequence ID, find the first matching record.