[Python] return if list is consecutive within python col

I've got a column within a df labelled a. It contains a list of int values. I want to return if they are consecutive or not.

I can do it passing in a single list but I want to iterate over each row.

df = pd.DataFrame({'a': [[0,2], [9,11,12], [0,1,2], [10,11,13]]})

def cons(L):
return all(n-i == L[0] for i,n in enumerate(L))

print(cons(df['a'][0])) # works

df['cons'] = df['a'].apply(cons, axis=1) # error


intended:

a cons
0 [0, 2] False
1 [9, 11, 12] False
2 [0, 1, 2] True
3 [10, 11, 13] False

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