code: def certify_printable(value, nonprintable=False, required=True):
      
      certify_params(
          (certify_bool, 'nonprintable', nonprintable),
      )
      if certify_required(
          value=value,
          required=required,
      ):
          return
      _certify_printable(
          value=value,
          nonprintable=nonprintable,
          required=required,
      )
docs: Certifier for human readable (printable) values.
  
      :param unicode value:
          The string to be certified.
      :param nonprintable:
          Whether the string can contain non-printable characters. Non-printable characters are
          allowed by default.
      :param bool required:
          Whether the value can be `None`. Defaults to True.
      :raises CertifierTypeError:
          The type is invalid
      :raises CertifierValueError:
          The value is invalid