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of the same form as sys.version_info:
(PY_MAJOR_VERSION, # the 2 in 2.1.0a3; an int
PY_MINOR_VERSION, # the 1; an int
PY_MICRO_VERSION, # the 0; an int
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OptionalRelease records the first release in which
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from __future__ import FeatureName
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argument to the builtin function compile() to enable the feature in
dynamically compiled code. This flag is stored in the .compiler_flag
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