code: def __str__(self):
      val = ""
      for i, row in enumerate(self.rows):
          for pos, j in enumerate(row):
              val += f"  {str((i, j))}\t{str(self.data[i][pos])}\n"
      return val[:-1]
  
imports: from bisect import bisect_left
  import numpy
  from ._matrix import spmatrix
  from ._base import _spbase, sparray, issparse
  from ._index import IndexMixin, INT_TYPES, _broadcast_arrays
  from ._sputils import getdtype, isshape, isscalarlike, upcast_scalar, check_shape, check_reshape_kwargs
  from .None import _csparsetools
label_desc: Use image node_id 8 for calling the _lil_base obj's underlying member method code with example usage: obj.__str__() and returns: val