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python - list.reverse does not return list?

The return object is named None for list.reverse(). So this code fails when I call solution(k). Is there any way I can get around making a temporary? Or how should I do it?

fCamel = 'F'
bCamel = 'B'
gap = ' '

k = ['F', ' ', 'B', 'F']

def solution(formation):
    return ((formation.index(bCamel) > (len(formation) - 1 - (formation.reverse()).index(fCamel))))

p.s. This is my first code in python. I thought it was functional.

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You can use slicing to return the reversed list:

l[::-1]

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