code: def symmetry(self):
      return self._symmetry
  
imports: import os
  import sys
  from numpy import asarray, real, imag, conj, zeros, ndarray, concatenate, ones, can_cast
  from scipy.sparse import coo_matrix, isspmatrix
label_desc: Use image node_id 6 for calling the MMFile obj's underlying member method code with example usage: obj.symmetry() and returns: self