code: def test_nested_iteratables():
      assert validate("2 * 3 * int", [(1, 2, 3), (4, 5, 6)])
  
file_path: datashader/datashader/datashape/tests/test_user.py
imports: import pytest
  from datashader.datashape.user import issubschema, validate
  from datashader.datashape import dshape
  from datetime import date, time, datetime
  import numpy
label_desc: Use image node_id 2 for calling a global function with example usage: test_nested_iteratables() without return types