Mutating Within Functions >>> def mystery(1st):mutative function 1st.pop() 1st.pop() >>> four=[4,4,4,4] >>mystery(four)） >>four [4,4]Mutating Within Functions >>> def mystery(lst): # mutative function ... lst.pop() ... lst.pop() >>> four = [4, 4, 4, 4] >>> mystery(four) >>> four [4, 4]