[Python] Python how to replace a None value in list with string None [duplicate]

I have list:

test_list = ['one','two',None]


Is there any simple way to replace None with 'None' ,without using index, because index for None maybe different each time.

I tried :

conv = lambda i : i or 'None'
res = [conv(i) for i in test_list]


It works ,is there another way to do so ?

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