code: def test_path_get_prefix():
      p1 = ObjectPath.root()
      p2 = p1.attr("foo")
      p3 = p2.array_index(5)
  
      assert p3.parent == p2
      assert p2.parent == p1
      assert p1.parent is None
  
      assert p2.get_prefix(1) == p1
  
      assert p3.get_prefix(1) == p1
      assert p3.get_prefix(2) == p2
      assert p3.get_prefix(3) == p3
  
      with pytest.raises(IndexError) as e:
          p3.get_prefix(0)
      assert "Prefix length must be at least 1" in str(e.value)
  
      with pytest.raises(IndexError) as e:
          p3.get_prefix(4)
      assert (
          "Attempted to get a prefix longer than the path itself"
          in str(e.value)
      )
  
file_path: tvm/tests/python/ir/test_object_path.py
imports: import pytest
  import tvm
  from tvm.runtime import object_path
  from tvm.runtime.object_path import ObjectPath
label_desc: Use image node_id 12 for calling a global function with example usage: test_path_get_prefix() without return types