[codewars]2.编写一个maskify函数，把字符串除了后四位用“#”代替

# return masked string def maskify(cc): return "#"*(len(cc)-4) + cc[-4:] maskify("4556364607935616") == "############5616" maskify( "64607935616") == "#######5616" maskify( "1") == "1" maskify( "") == ""