[Twisted-web] using threads in twisted

[Ivan]

for example, I want to run two tasks ( using thread ), waiting while this tasks is end and after run  next several tasks
How to do this using twisted ? Any example ?

def task(n):
    sleep n

1) 1,2 tasks begin  ( thread )
2) waiting while all tasks is ends
3) ...
4) run 3,4,5,6,7 tasks ( thread )
5) waiting while all tasks is ends
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