Daniel Arbuckle's Mastering Python

The cancel method

The cancel method tries to tell the system that we don't want the call to happen after all (refer to the following code example):

This code example is not guaranteed to work because if a worker process has already begun a job, that job is no longer cancellable.

• If the job connected to a future object can't be cancelled, the cancel method returns false
• If the cancellation succeeded, the cancel method returns true

The concurrent.futures module is perfectly suited to farming out computational tasks to multiple processes to take advantage of the CPU power of multicore and multiprocessor computers. The map, submit, wait, and ...