import Class operation = int(input()) if operation == 1: try: num = int(input()) except: print("请输入一个整数") while True: flag = int(Class.Collatz(num)) if flag != 1: num = flag print(flag) else: print(flag) break elif operation == 2: spam = ['yyl', 'zxy', 'yyl', 'zxy'] print(Class.ListToString(spam)) elif operation == 3: Class.beautifulprint() elif operation == 4: Class.Dictionary(2) elif operation == 5: Class.stringexcerise()