@property
    def free_symbols(self):

        return set().union(*[i.free_symbols for i in self])
Read from a client with the given Read Preference.
dataset/ETHPy150Open sympy/sympy/sympy/matrices/matrices.py/MatrixBase.free_symbols--crossover with--dataset/ETHPy150Open mongodb/mongo-python-driver/test/utils.py/read_from_which_host