New PEP: The directive statement

[Martin von Loewis]

aahz at panix.com (Aahz Maruch) writes:

> >What is the Python mechanism for ensuring a particular (or minimal) version
> >of Python is being used? Is there one?  I'm talking about something like
> >Tcl's [package require Tcl 8.3] or some such.
> 
> assert (sys.version_info[0] >= 2) and (sys.version_info[1] > 0)

That will fail on Python 3.0, so you better write

  assert sys.verion_info >= (2,0)

It also works for specific modules, e.g.

  assert xml.version_info >= (0,6,4)

Regards,
Martin