Inserting elements to a list in Python

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I have a list Cb. I want to insert element 0 at len(Cb[0]) but I am getting an error. I present the expected output.

Cb=[[1.0, 0.0, 0.0]] 

for i in range(0,len(Cb[0])):
    Cb=Cb[0].insert(0,len(Cb[0])) 
print(Cb)

The error is

in <module>
    Cb=Cb[0].insert(0,len(Cb[0]))

TypeError: 'NoneType' object is not subscriptable

The expected output is

[[1.0, 0.0, 0.0, 0.0]]


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