code: def __setitem__(self, key, x):
      if isinstance(key, tuple) and len(key) == 2:
          row, col = key
          # Fast path for simple (int, int) indexing.
          if isinstance(row, INT_TYPES) and isinstance(col, INT_TYPES):
              x = self.dtype.type(x)
              if x.size > 1:
                  raise ValueError(
                      "Trying to assign a sequence to an item"
                  )
              return self._set_intXint(row, col, x)
          # Fast path for full-matrix sparse assignment.
          if (
              isinstance(row, slice)
              and isinstance(col, slice)
              and row == slice(None)
              and col == slice(None)
              and issparse(x)
              and x.shape == self.shape
          ):
              x = self._lil_container(x, dtype=self.dtype)
              self.rows = x.rows
              self.data = x.data
              return
      # Everything else takes the normal path.
      IndexMixin.__setitem__(self, key, x)
  
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 27 for calling the _lil_base obj's underlying member method code with example usage: obj.__setitem__(key, x) and returns: self