code: def test_printing_TensMul():
      R3 = TensorIndexType("R3", dim=3)
      p, q = tensor_indices("p q", R3)
      K = TensorHead("K", [R3])
  
      assert repr(2 * K(p)) == "2*K(p)"
      assert repr(-K(p)) == "-K(p)"
      assert repr(-2 * K(p) * K(q)) == "-2*K(p)*K(q)"
      assert repr(-I * K(p)) == "-I*K(p)"
      assert repr(I * K(p)) == "I*K(p)"
  
label_desc: Use image node_id 1 for calling a global function with example usage: test_printing_TensMul() without return types