def FormatIntegralLastKey(value):
  """Formats an integral last key as a string, zero-padding up to 15 digits of precision.

  15 digits is enough precision to handle any conceivable values we'll need to return.
  """
  assert value < 1000000000000000, value
  return value % '%015d'
dataset/ETHPy150Open viewfinderco/viewfinder/backend/www/www_util.py/FormatIntegralLastKey/swapped operands of `%`