python - Convert certain values in list to int -

i have list of lists , want convert second value in each list int since string

[['hello','how','are','you','1'],['hello','how','are','you','2']] 

i trying convert index 4 int in each list within larger list when do

for hi in above:     int(hi[4]) 

it returning int when print list , not entire list.

just traverse , convert using int() function every 4th element in every list inside :

for li in my_list:     li[4] = int(li[4])