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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 _check_stations_csv(self, usr, root):
        ''' Reclocate a stations.csv copy in user home for easy manage.
            E.g. not need sudo when you add new station, etc '''

        if path.exists(path.join(usr, 'stations.csv')):
            return
        else:
            copyfile(root, path.join(usr, 'stations.csv'))