code: def __str__(self):
      return self.to_dense().__str__()
  
imports: import numpy
  from matplotlib import _api
  from matplotlib.tri import Triangulation
  from matplotlib.tri._trifinder import TriFinder
  from matplotlib.tri._tritools import TriAnalyzer
label_desc: Use image node_id 6 for calling the _Sparse_Matrix_coo obj's underlying member method code with example usage: obj.__str__() and returns: self