python - ThreadPoolExecutor number of threads -


i trying use threadpoolexecutor in python using futures backport package. however, problem threads executed @ same time there no actual pooling take place. more 10 threads of function instead of 5 , others. use following code find wrong or backported implementation? thank you!

with threadpoolexecutor(max_workers=5) executor:     futures = [executor.submit(f, x, y) t in range(10)]     future in as_completed(futures):         self.trees.append(future.result())


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