Assign None to values cycled in zip [duplicate]

Question

I want to cycle values in a loop but also using the zip function, however the catch is to manipulate those values that are cycled. In this case, if the values are cycled then return a string "None" instead.

For example:

data = {
    'carNumbers':[
    1, 2, 3, 2, 3, 2, 1, 3
    ],
    'bikeNumbers':[
        4, 3, 5
    ],
    'otherNumbers':[
        2
    ]
       }

I can do the following:

from itertools import cycle
test={}
for car, bike, other in zip(data['carNumbers'],cycle(data['bikeNumbers']),cycle(data['otherNumbers'])):
    print(other)

2 2 2 2 2 2 2 2

However, because other has a shorter length than the largest length car those extra values should return the following:

2 "None" "None" "None" "None" "None" "None" "None"

Answer 1

You can use itertools.zip_longest to handle this case, with this function, the missing values will be replaced with whatever you pass to the fillvalue argument (defaults to None).

list(itertools.zip_longest(data['carNumbers'],data['bikeNumbers'],data['otherNumbers'], fillvalue='value'))