concurrent.futures.wait(fs, timeout=None, return_when=ALL_COMPLETED)
Wait for the Future instances (possibly created by different Executor instances) given by fs to complete. Returns a named 2-tuple of sets. The first set, named done, contains the futures that completed (finished or were cancelled) before the wait completed. The second set, named not_done, contains uncompleted futures.
timeout can be used to control the maximum number of seconds to wait before returning. timeout can be an int or float. If timeout is not specified or None, there is no limit to the wait time.
return_when indicates when this function should return. It must be one of the following constants:
| Constant | Description |
|---|---|
FIRST_COMPLETED | The function will return when any future finishes or is cancelled. |
FIRST_EXCEPTION | The function will return when any future finishes by raising an exception. If no future raises an exception then it is equivalent to ALL_COMPLETED. |
ALL_COMPLETED | The function will return when all futures finish or are cancelled. |
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