http://docs.python.org/library/__future__
http://stackoverflow.com/questions/3791903/which-python-version-need-from-future-import-with-statement/3792223#3792223
up vote0down votefavorite | Currently i'm using python 2.6.5, I didn't use from __ future __ import with_statement,it can use with statement all right. I want to know in which version we need use from __ future __ import with_statement,which not? |
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up vote2down voteaccept | You only need it in Python 2.5. Older versions (<= 2.4) don't support it and newer versions (>= 2.6) have it enabled by default. So if you want to support Python >= 2.5, you can simply put the from __future__ import with_statement at the beginning. For newer versions, it will simply be ignored. |
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up vote0down voteaccept | From the doc: New in version 2.5.
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up vote1down voteaccept | __future__ features are self-documenting. Try this:
>>> from __future__ import with_statement
>>> with_statement.getOptionalRelease()
(2, 5, 0, 'alpha', 1)
>>> with_statement.getMandatoryRelease()
(2, 6, 0, 'alpha', 0)
These respectively indicate the first release supporting from __future__ import with_statementand the first release to support it without using from __future__. Also, read this: >>> import __future__
>>> help(__future__)
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