I’ve got a column within a df labelled a. It contains a list of string 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':[[10,11,12], [10,11,12], [10,11,12], [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  [10, 11, 12]  True
1  [10, 11, 12]  True
2  [10, 11, 12]  True
3  [10, 11, 13] False