```python args = parse_args()

parse ops

for op in args.ops: if op is groups = dict(str->list[ops])

for line in file: parts = line.split(args.delimiter) if groupby: group = groupby(parts) else: group = default

if group not in groups:
    groups.add_group(group, ops)

for op in groups[group]:
    op.process(parts)

for group in groups: print(group, [op.result() for op in group]) ```