Using python before it is selected?

[Jeremy Lavergne]

> So the port I'm working on uses Python and requires a bunch of modules as dependencies.  That's working OK but then my port's configure _uses_ python to test if the dependencies are installed. If this is the first time installing python on a machine, no version of python is 'selected'.  aka ...
> 
>> AT-MBP12:mp WCT$ port select --list python
>> Available versions for python:
>> 	none (active)
>> 	python25-apple
>> 	python26
>> 	python26-apple
>> 	python27-apple
> 
> It would seem to me that MacPorts ought to 'select' the first version of python when it is installed, no?  In my port, is there a way to test for 'none' and then set the one I want?   I wouldn't change the version out from under the user if they've actually selected one.

Well, if your port is after a specific version the easy way would be check the modules with pythonX.Y. You should also lib-depend on this version of python, which means it WILL BE AVAILABLE when you build and install.

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