Python 3to2工具-至少需要

Question

So, I'm using 3to2 to port my Python 3.3 code back to version 2.x. I, believe, I correctly installed 3to2 by downloading the .tar.gz, cd to the file and running python3.3 setup.py build and then python3.3 setup.py install , so I don't think that is what is causing the issue.

The issue: the issue is that after I cd to the correct file, with the code I wish to use 3to2 on, I run 3to2 filename.py , which then returns the following:

 Checking Python version info...
 ERROR: 3to2 requires at least Python 2.7 in the 2.x branch.

Now, I have Python 3.3 installed, which I did myself and Python 2.7, which came pre-installed on my [Mac - OSX Lion 10.7.3] computer. Any ideas why this may be? Thanks!

Answer 1

Even though this question is pretty old, I figured I can still help if anyone else has this same issue.

• If you've installed 3to2 already, uninstall it. I used pip, so if you did too, run a pip uninstall 3to2 .
• If you're on OSX, do a quick python --version and make sure that your current version is 2.7.*.
• To get a working version of 3to2 run 'sudo python -m pip install 3to2'.

Now, when you run 3to2, it will be referencing the correct python version.

Answer 2

I feel your pain I spent the last hour troubleshooting this issue on my mac, below is what I did...

Open terminal, type :

brew install python

note : brew might mention that python is already installed, or that it's installed but unlinked... either way. Then type :

brew link --overwrite python

echo export PATH='/usr/local/bin:$PATH' >> ~/.bash_profile

If this doesn't work try typing brew doctor , I would have never been able to fix my problem without it's feedback..

This fixed my problem, but there might another way...