Some concerns about these constants:

1) It looks to me like `PROJECT_ROOT` is the root repository (`edx-platform`), because it's two directories up from this file.  `REPO_ROOT` is then one directory up from that, which doesn't seem correct.

2) `/mitx` is deprecated; take a look at the `create_dev_env.sh` script for the default directory structure.

3) I don't think `ENV_ROOT` is a virtualenv directory, as the comment suggests

4) I don't think the print statement is necessary.