Question

     for line in f.readlines():
     (addr, vlanid, videoid, reqs, area) = line.split()

     if vlanid not in dict:
          dict[vlanid] = []

     video_dict = dict[vlanid]

     if videoid not in video_dict:
         video_dict[videoid] = []

     video_dict[videoid].append((addr, vlanid, videoid, reqs, area))

Here is my code, I want to use videoid as indices to creat a list. the real data of videoid are different strings like this : FYFSYJDHSJ

I got this error message:

video_dict[videoid] = []
TypeError: list indices must be integers, not str

But now how to add identifier like 1,2,3,4 for different strings in this case?

Answer 1

Don’t use dict as a variable name. Try this (d instead of dict):

d = {}
for line in f.readlines():
    (addr, vlanid, videoid, reqs, area) = line.split()
    video_dict = d.setdefault(vlanid, {})
    video_dict.setdefault(videoid, []).append((addr, vlanid, videoid, reqs, area))