code: def tocsc(self, copy=False):
      return self.tocoo(copy=False).tocsc(copy=copy)
  
imports: import itertools
  import numpy
  from ._matrix import spmatrix
  from ._base import _spbase, sparray, issparse
  from ._index import IndexMixin
  from ._sputils import isdense, getdtype, isshape, isintlike, isscalarlike, upcast, upcast_scalar, check_shape
label_desc: Use image node_id 43 for calling the _dok_base obj's underlying member method code with example usage: obj.tocsc(copy) and returns: self