L=[1.5,"hi",3,True] 
for x in L:
    if type(x)==float:
        print(x, L.index(x))

输出：-

1.5 0

已更新查询..！

#列出理解

L=[1.5,"hi",3,True] 
print([[x,L.index(x)] for x in L if type(x)==float])

输出：-

[[1.5, 0]]