``` import random list=[1,2,3,4] a = '' if list: a = random.choice(list) else: a ='不能为空' print(a) ``` ``` import random list1=[1,2,3,4] a = '' if list1: a = random.shuffle(list1) else: a ='不能为空' print(a) print(list1) ``` ``` import random list1=[1,2,3,4] a = '' list2 = list1 if list1: a = random.shuffle(list2) else: a ='不能为空' print(a) print(list1) print(list2) ``` ``` import random list1=[1,2,3,4] a = '' list2 = list1.copy() if list1: a = random.shuffle(list2) else: a ='不能为空' print(a) print(list1) print(list2) ``` ``` import random list1=[1,2,3,[1,2,3,[1,2,3,{'a':4}]]] a = '' list2 = list1.copy() if list1: a = random.shuffle(list2) else: a ='不能为空' print(a) print(list1) print(list2) ``` ``` import random str1 = 'abcd' list1=[1,2,3,[1,2,3,[1,2,3,{'a':4}]]] a = '' str2 = str1 list2 = list1.copy() if list1: a = random.shuffle(list2) str2 = str2[::-1] else: a ='不能为空' print(a) #print(s) print(str1) print(str2) print(list1) print(list2) ```