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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 _get_ericscript_path(self):
 """Retrieve PATH to the isolated eriscript anaconda environment. """

        es = utils.which(os.path.join(utils.get_bcbio_bin(), self.EXECUTABLE))
        return os.path.dirname(os.path.realpath(es))