python中返回列表中特定指定元素的所有索引

>>> test1
[‘aa‘, ‘bb‘, ‘aa‘, ‘cc‘, ‘aa‘, ‘cc‘, ‘dd‘, ‘xx‘, ‘bb‘]
>>> test1.index("aa")
0

>>> test1
[‘aa‘, ‘bb‘, ‘aa‘, ‘cc‘, ‘aa‘, ‘cc‘, ‘dd‘, ‘xx‘, ‘bb‘]
>>> test1.count("aa")
3
>>> tmp = -1
>>> for i in range(test1.count("aa")):
    tmp = test1.index("aa",tmp + 1,len(test1))
    print("aa",tmp)

    
aa 0
aa 2
aa 4