Declarar un campo tipo base64 con el siguiente base64 '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' y luego decodificarlo

import base64

def decodificar(base):
  return base64.b64decode(base)

base = 'UEsDBBQAAAAIACil5VZGmJorKAEAAC8CAAArAAAAMEEyRDMyQzItRDlFQS00MTQ0LThCNkEtQTg1NUZCRDA4MUY5XzAxLnR4dMWPzU7DMBCE75X6Dn4AjPybJr05jlMFQVI5LffUuCISjavWve6z40JBQnBH2st8s7Pa2V7GF7B7Zw7jOZygDYfdyd9EwtY7f4zfxrdM1npwUHv3Oly3xzB9Cu1PcdyPbnAJ9UOEpzDFAGbvXQw6HI6nsBum6MGc4xAv51tqmJx/+8jMZ0SWlWZVgReEMizyWm