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src/s/a/sage-HEAD/src/sage/modular/arithgroup/arithgroup_generic.py   sage(Download)
        # then self has no elliptic points either.
 
        from all import Gamma0, is_CongruenceSubgroup
        if is_CongruenceSubgroup(self):
            if self.is_subgroup(Gamma0(self.level())) and Gamma0(self.level()).nu2() == 0:
        # then self has no elliptic points either.
 
        from all import Gamma0, is_CongruenceSubgroup
        if is_CongruenceSubgroup(self):
            if self.is_subgroup(Gamma0(self.level())) and Gamma0(self.level()).nu3() == 0: