def get_installed_pypackages():
    return {p.project_name.lower(): p for p in pkg_resources.working_set}
def __init__(self, root, cwd, badfn=None, rules=[]):
        super(treematcher, self).__init__(root, cwd, badfn)
        rules = list(rules)
        self._matcher = pathmatcher.treematcher(rules)
        self._rules = rules