3-1 = __________fgggg_______
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s=”hello”,t=”world”,s+=t,则s为________________,s[-1]为________,s[2:5]为_____________,s[::3]为____________,s[-2::-1]为____________________。
使用fromkeys()创建字典,执行下面代码,则运行结果为______。pet_dict=dict.fromkeys([‘name’,’age’,’weigh’,’height’])print(pet_dict)