Not all logical operators are available in Python in a nice way. Write a script that contains the following: (a) A function implies(p,q) that for truth values p and q returns p+q. (b) A function ifandonlyif (p, q) that for truth values p and q returns PHq. (c) A function xor (p,q) that for truth values p and q returns poq. (d) A function truthtable2(f) that for a function f in two propositional variables prints the truth table of f. (e) truthtable2(implies) (f) truthtable2(ifandonlyif) (g) truthtable2(xor)