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3.4.0

  • Backported bpo-21423: Add an initializer argument to {Process,Thread}PoolExecutor (only ThreadPoolExecutor for now; PR by Fahrzin Hemmati)

3.3.0

  • Backported bpo-24882: Let ThreadPoolExecutor reuse idle threads before creating new thread

3.2.0

  • The ThreadPoolExecutor class constructor now accepts an optional thread_name_prefix argument to make it possible to customize the names of the threads created by the pool. Upstream contribution by Gregory P. Smith in https://bugs.python.org/issue27664.
  • Backported fixes from upstream (thanks Lisandro Dalcin):

3.1.1

  • Backported sanity checks for the max_workers constructor argument for ThreadPoolExecutor and ProcessPoolExecutor
  • Set the default value of max_workers in ThreadPoolExecutor to None, as in upstream code (computes the thread pool size based on the number of CPUs)
  • Added support for old-style exception objects
  • Switched to the PSF license

3.1.0

  • (Failed release)

3.0.5

  • Fixed OverflowError with ProcessPoolExecutor on Windows (regression introduced in 3.0.4)

3.0.4

  • Fixed inability to forcibly terminate the process if there are pending workers

3.0.3

  • Fixed AttributeErrors on exit on Python 2.x

3.0.2

  • Made multiprocessing optional again on implementations other than just Jython

3.0.1

  • Made Executor.map() non-greedy

3.0.0

  • Dropped Python 2.5 and 3.1 support
  • Removed the deprecated "futures" top level package
  • Applied patch for issue 11777 (Executor.map does not submit futures until iter.next() is called)
  • Applied patch for issue 15015 (accessing a non-existing attribute)
  • Applied patch for issue 16284 (memory leak)
  • Applied patch for issue 20367 (behavior of concurrent.futures.as_completed() for duplicate arguments)

2.2.0

  • Added the set_exception_info() and exception_info() methods to Future to enable extraction of tracebacks on Python 2.x
  • Added support for Future.set_exception_info() to ThreadPoolExecutor

2.1.6

  • Fixed a problem with files missing from the source distribution

2.1.5

  • Fixed Jython compatibility
  • Added metadata for wheel support

2.1.4

  • Ported the library again from Python 3.2.5 to get the latest bug fixes

2.1.3

  • Fixed race condition in wait(return_when=ALL_COMPLETED) (http://bugs.python.org/issue14406) -- thanks Ralf Schmitt
  • Added missing setUp() methods to several test classes

2.1.2

  • Fixed installation problem on Python 3.1

2.1.1

  • Fixed missing 'concurrent' package declaration in setup.py

2.1

  • Moved the code from the 'futures' package to 'concurrent.futures' to provide a drop in backport that matches the code in Python 3.2 standard library
  • Deprecated the old 'futures' package

2.0

  • Changed implementation to match PEP 3148

1.0

  • Initial release