code analysis - Tool to determine what lowest version of Python required?

Question

Is there something similar to Pylint, that will look at a Python script (or run it), and determine which version of Python each line (or function) requires?

For example, theoretical usage:

$ magic_tool <EOF
with something:
    pass
EOF
1: 'with' statement requires Python 2.6 or greater

$ magic_tool <EOF
class Something:
    @classmethod
    def blah(cls):
        pass
EOF
2: classmethod requires Python 2.2 or greater
$ magic_tool <EOF
print """Test
"""
EOF
1: Triple-quote requires Python 1.5 of later

Is such a thing possible? I suppose the simplest way would be to have all Python versions on disc, run the script with each one and see what errors occur..

Answer 1

Inspired by this excellent question, I recently put together a script that tries to do this. You can find it on github at pyqver.

It's reasonably complete but there are some aspects that are not yet handled (as mentioned in the README file). Feel free to fork and improve it!