On Mon, Jun 17, 2019 at 10:15 PM Igor Korot <ikoro...@gmail.com> wrote: > > Hi, > Is there a place where there is a full list of incompatibilities between > python 2 and python 3 is available and how to fix them? > > I'm looking for a way to fix following code, which runs perfectly with python > 2 > (and make it work with both python 2 and python 3): > > if bytes[0:16].tostring() != '<some_string>': > > I know there are automated tools that can help you do the upgrade, but > automated tools can do only so much.... > > And I am not sure if they can just add python 3 code and include version > check.
If "bytes" here refers to a byte string, and not to the actual type called "bytes" (the same as "str" in Py2), the way I'd do it is: if bytes[:16] != b"<some_string>": However, I have no idea what your .tostring() method is, since it doesn't seem to be a method on the Py2 str object, nor of the bytearray object (my next guess). So further details/context would be needed. I would strongly recommend requiring either Python 2.7 or Python 3.5+. There should be no need to support Python 2.6 or older, and if you restrict your Py3 support to 3.5 and better, you can take advantage of a number of syntactic compatibilities - u"text" and b"ASCII bytes" will work on both, and b"x %d y" % 1234 will have equivalent functionality. Features like that will make it much easier to code to the common subset. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
