Value trace problems with assisting references for Python programming self-study. - San Hay Mar Shwe; Nobuo Funabiki; Yan Watequlis Syaifudin; Phyu Phyu Tar; Htoo Htoo Sandi Kyaw; Hnin Aye Thant; Wen-Chung Kao; Nandar Win Min; Thandar Myint; Ei Ei Htet (Int. J. Web Inf. Syst., 2021)