-pythonthutor-solution-

solution https://janke-learning.github.io/parsonizer/?snippet=let%20a%20%3D%20%22b%22%2C%20b%20%3D%20%22a%22%3B%0Alet%20_%20%3D%20'%20'%3B%0A%0A_%20%3D%20b%3B%0Ab%20%3D%20a%3B%0Aa%20%3D%20_%3B