code: def test_nested(self):
      self.assertEqual("1+(2+3)", strip_parens("(1+(2+3))"))
  
imports: import unittest
  from PIL import Image
  from tinygrad.helpers import Context, ContextVar, merge_dicts, strip_parens, prod, round_up, fetch, fully_flatten, from_mv, to_mv
  from tinygrad.shape.symbolic import Variable, NumNode
label_desc: Use image node_id 2 for calling the TestStripParens obj's underlying member method code with example usage: obj.test_nested() without return types