def has_builder_func(builder):
  def inner(row):
    for b, failed in row['bbs']:
      if b == builder and failed == 'true':
        return 1
    return 0
  return inner

to_cluster = main_data.copy(deep=True)
for i, builder in enumerate(all_builders):
  to_cluster['builder_%s' % builder] = to_cluster.apply(has_builder_func(builder), axis=1)