Backport of the concurrent.futures package to Python 2.6 and 2.7
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agronholm Upgraded the Python 3 warnings
Since some users have ignored the warnings and tried to use this on Python 3, the warning has been changed to a hard failure when running setup.py on py3. The README now also reflects this.
Latest commit 1f9c23f Apr 29, 2018

README.rst

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This is a backport of the concurrent.futures standard library module to Python 2.

It does not work on Python 3 due to Python 2 syntax being used in the codebase. Python 3 users should not attempt to install it, since the package is already included in the standard library.

To conditionally require this library only on Python 2, you can do this in your setup.py:

setup(
    ...
    extras_require={
        ':python_version == "2.7"': ['futures']
    }
)

Or, using the newer syntax:

setup(
    ...
    install_requires={
        'futures; python_version == "2.7"'
    }
)

Warning

The ProcessPoolExecutor class has known (unfixable) problems on Python 2 and should not be relied on for mission critical work. Please see Issue 29 and upstream bug report for more details.