how to use string as list's indices in Python

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?

NPE · Accepted Answer · 2011-12-21 16:31:19Z

4

Use a dictionary instead of a list:

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

P.S. I recommend that you call dict something else so that it doesn't shadow the built-in dict.

answered Dec 21, 2011 at 16:31

NPE

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Comments

eumiro · Accepted Answer · 2011-12-21 16:35:44Z

2

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))

answered Dec 21, 2011 at 16:35

eumiro

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Comments

Makoto · Accepted Answer · 2011-12-21 19:29:32Z

0

As suggested above, creating dictionaries would be the most ideal code to implement. (Although you should avoid calling them dict, as that means something important to Python.

Your code may look something like what @aix had already posted above:

for line in f.readlines():
    d = dict(zip(("addr", "vlanid", "videoid", "reqs", "area"), tuple(line.split())))

You would be able to do something with the dictionary d later in your code. Just remember - iterating through this dictionary will mean that, if you don't use d until after the loop is complete, you'll only get the last values from the file.

answered Dec 21, 2011 at 19:29

Makoto

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