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mlzboy
mlzboy

Reputation: 14691

Which python version needs from __future__ import with_statement?

Using python 2.6.5, I can use the with statement without calling from __future__ import with_statement. How can I tell which version of Python supports with without specifically importing it from __future__?

Upvotes: 28

Views: 12956

Answers (3)

Mark Tolonen
Mark Tolonen

Reputation: 177715

__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_statement and the first release to support it without using from __future__.

Also, read this:

>>> import __future__
>>> help(__future__)

Upvotes: 51

Lie Ryan
Lie Ryan

Reputation: 64845

From the doc:

New in version 2.5.

Upvotes: 2

AndiDog
AndiDog

Reputation: 70148

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.

Upvotes: 17

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