a program i want: file line slicing

[Gribouillis]

any suggestions?

I think it's a very good idea. I'm thinking about the itertools module with its dropwhile() and takewhile() methods and I imagine a DSL such as

Output:
take until line 10
drop 3 lines
take until regex "foo(bar|qux)"
drop until "begin"
take until "end"
take 1 line

Such a "program" would generate an iterable of lines to be sent to a new file. The DSL could manage several input files at the same time...