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+contextlib2 is a backport of the standard library’s contextlib module to
+earlier Python versions.
+
+It also serves as a real world proving ground for possible future
+enhancements to the standard library version.
+
+Development
+
+contextlib2 has no runtime dependencies, but requires unittest2 for
+testing on Python 2.x, as well as setuptools and wheel to generate
+universal wheel archives.
+
+Local testing is just a matter of running python test_contextlib2.py.
+
+Python3 is an optional dependency.