code: def test_structure_str(self):
      self.assertEqual(
          str(dshape("{x:int32, y:int64}")), "{x: int32, y: int64}"
      )
  
file_path: datashader/datashader/datashape/tests/test_str.py
imports: import unittest
  import pytest
  from datashader import datashape
  from datashader.datashape import dshape, DataShapeSyntaxError
label_desc: Use image node_id 2 for calling the TestDataShapeStr obj's underlying member method code with example usage: obj.test_structure_str() without return types