code: def test_del_attr():
      from deepchem.utils.attribute_utils import del_attr
  
      class MyClass:
          def __init__(self):
              self.a = 1
              self.b = 2
  
      obj = MyClass()
      del_attr(obj, "a")
      alpha = 0
      try:
          obj.a
      except AttributeError:
          alpha = 1  # alpha changes to 1 if not found
      assert alpha == 1
  
label_desc: Use image node_id 3 for calling a global function with example usage: test_del_attr() without return types