@classmethod
    def _transform(cls, expr, x):
        poly = PurePoly(expr, x, greedy=False)
        return preprocess_roots(poly)
Creates a new Keyczar crypt keyset used for signing and signature
dataset/ETHPy150Open sympy/sympy/sympy/polys/rootoftools.py/RootSum._transform--crossover with--dataset/ETHPy150Open viewfinderco/viewfinder/backend/base/secrets_tool.py/_PutSigningKeyset