<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def prepare_env(cls):
 """Prepares current environment and returns Python binary name. This adds some virtualenv friendliness so that we try use uwsgi from it. :rtype: str|unicode """

        os.environ['PATH'] = cls.get_env_path()
        return os.path.basename(Finder.python())