why

calc.py

while globals().get("c",  True): print((lambda F: F[F[8][7]](F[F[8][4]])[F[F[8][6]](F[F[8][3]](F[F[8][2]],  F[F[8][1]]))](F[F[8][5]](F[F[8][3]],  F[F[8][0]])))([(lambda j: [(lambda f: j + str((x := f())[0] + x[1])), (lambda f: j + str((x := f())[0] - x[1])), (lambda f: j + str((x := f())[0] * x[1])), (lambda f: ("Math: can't divide by zero"if (x := f())[1] == 0else (j + str((x[0] / x[1]))))), (lambda f: j + str((x := f())[0] ** x[1])), (lambda f: ("Math: there is no zero'th root"if (x := f())[1] == 0else (j + str((x[0] ** (1 / x[1])))))), (lambda _: globals().update({"c": False}) or "Ending Program")]), (lambda i: max(-1,  min(i,  6))), (lambda f,  t: (lambda: ((f("First Number: ",  t) or "6"), (f("Second Number: ",  t) or "6")))), "The result is: ", (lambda q,  t: t(input(q))), "calc:\n\t0: sum\n\t1: sub\n\t2: mult\n\t3: div\n\t4: pow\n\t5: root\n\t6: end program\nop: ", int, float, [7,  6,  5,  4,  3,  2,  1,  0]]))

why