On 2007-07-30, at 15:29, Steven D'Aprano wrote:
> How would one tell at runtime if a particular feature has been
> enabled by
> the "from __future__ import thing" statement?
>
> (I don't especially care whether the feature in question has been
> enabled
> via an explicit call to import, or because it has become the default.)
>
> Is there any general mechanism?
You probably have to care about imports vs. language defaults. But
it's not very difficult.
For imports you can use __future__ to help you. If your namespace
contains a feature you want to check for and it is identical to the
same feature in __future__, then the code has used from __future__
import feature. You could probably try something like this:
import __feature__
feature = "division"
if globals().get(feature, None) == __future__.__dict__[feature]:
print "Bingo!"
You can probably figure out how to use sys.version_info to check
whether the current Python version is higher than the one specified
in a feature line:
import __future__
import sys
if sys.version_info >= __future__.division.mandatory:
print "Bingo! Two in a row!"
Check the __future__ docstrings for more information.
--
[ [EMAIL PROTECTED] <*> Antti Rasinen ]
This drone-vessel speaks with the voice and authority of the Ur-Quan.
--
http://mail.python.org/mailman/listinfo/python-list
