code: def difference(a, b, grid_size=None, **kwargs):
      """Returns the part of geometry A that does not intersect with geometry B.
  
      If grid_size is nonzero, input coordinates will be snapped to a precision
      grid of that size and resulting coordinates will be snapped to that same
      grid.  If 0, this operation will use double precision coordinates.  If None,
      the highest precision of the inputs will be used, which may be previously
      set using set_precision.  Note: returned geometry does not have precision
      set unless specified previously by set_precision.
  
      Parameters
      ----------
      a : Geometry or array_like
      b : Geometry or array_like
      grid_size : float, optional
          Precision grid size; requires GEOS >= 3.9.0.  Will use the highest
          precision of the inputs by default.
      **kwargs
          See :ref:`NumPy ufunc docs <ufuncs.kwargs>` for other keyword arguments.
  
      See also
      --------
      set_precision
  
      Examples
      --------
      >>> from shapely import box, LineString, normalize, Polygon
      >>> line = LineString([(0, 0), (2, 2)])
      >>> difference(line, LineString([(1, 1), (3, 3)]))
      <LINESTRING (0 0, 1 1)>
      >>> difference(line, LineString())
      <LINESTRING (0 0, 2 2)>
      >>> difference(line, None) is None
      True
      >>> box1 = box(0, 0, 2, 2)
      >>> box2 = box(1, 1, 3, 3)
      >>> normalize(difference(box1, box2))
      <POLYGON ((0 0, 0 2, 1 2, 1 1, 2 1, 2 0, 0 0))>
      >>> box1 = box(0.1, 0.2, 2.1, 2.1)
      >>> difference(box1, box2, grid_size=1)
      <POLYGON ((2 0, 0 0, 0 2, 1 2, 1 1, 2 1, 2 0))>
      """
  
      if grid_size is not None:
          if lib.geos_version < (3, 9, 0):
              raise UnsupportedGEOSVersionError(
                  "grid_size parameter requires GEOS >= 3.9.0"
              )
  
          if not np.isscalar(grid_size):
              raise ValueError(
                  "grid_size parameter only accepts scalar values"
              )
  
          return lib.difference_prec(a, b, grid_size, **kwargs)
  
      return lib.difference(a, b, **kwargs)
  
file_path: shapely/shapely/set_operations.py
imports: import numpy
  from shapely import GeometryType, lib
  from shapely.decorators import multithreading_enabled
  from shapely.errors import UnsupportedGEOSVersionError
label_desc: Use image node_id 1 for calling a global function with example usage: difference(a, b, grid_size) and returns: lib, lib