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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _fixed_path(self, projdir):
 """ Return the current PATH, fixed to remove the docker tox env. :return: sanitized path :rtype: str """

        res = []
        toxdir = os.path.join(projdir, '.tox')
        for p in os.environ['PATH'].split(':'):
            if not p.startswith(toxdir):
                res.append(p)
        return ':'.join(res)