It would be nice if PyDev would work with Python 1.5 interpreter. The first problem the comes up would be easy to fix. When choosing my 1.5.2 python interpreter in the PyDev options, I get an error because sys.version_info does not exist in 1.5. Calling sys.version can be used instead as sys.version works in all version of Python. That is one problem that could easily be fixed. I'm not sure what other problems there might be after that.