class_docstr: An ArrayList is a strongly typed list whose type can be anything that can
  be interpreted as a numpy data type.
docstr: Individual item sizes
docstr_tok: ["Individual","item","sizes"]
code: def itemsize(self):
      """Individual item sizes"""
      return (
          self._items[: self._count, 1] - self._items[: self._count, 0]
      )
  
file_path: vispy/vispy/visuals/collections/array_list.py
imports: import numpy
label_desc: Use image node_id 4 for calling the ArrayList obj's underlying member method code with example usage: obj.itemsize() and returns: unknown