元组类型究竟能不能被索引

#测试Python函数传入数组与一般变量时的不同效果

def fun1(a,b,c):
    for i in range(len(a)):
        a[i]+=1
   
    ++c
    for i in range(len(a)):print(a[i],' ')
    for i in range(b.__len__()):print(b[i],' ')
    print(c.__format__())

def main1():
    a=[1,2,3,4,5]#列表变量即数组
    b={1,2,3,4,5}#元祖，内容及长度恒不可改
    c=1
    fun1(a,b,c)
    print("OUT Fun1")
    for i in range(len(a)):print(a[i],' ')
    for i in range(b.__len__()):print(b[i],[ ])
    print(c.__format__())
main1()            

#代码运行反馈
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Traceback (most recent call last):
  File "test.py", line 39, in <module>
    main1()            
  File "test.py", line 34, in main1
    fun1(a,b,c)
  File "test.py", line 27, in fun1
    for i in range(b.__len__()):print(b[i],' ')
TypeError: 'set' object does not support indexing#这句话的含义应该是元祖类型不被许可索引吧？

***Repl Closed***