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From: Peter Otten <__peter__@web.de>
Subject: Re: Array of hash table
Date: Fri, 09 Jan 2015 08:55:37 +0100
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Xref: csiph.com comp.lang.python:83411

jyoti690saini@gmail.com wrote:

> Hello,
> 
>    Can any one tell me how to create
>    graph={
>   "nodes": [
>     {
>       "id": "n0",
>       "label": "A node",
>       "x": 0,
>       "y": 0,
>       "size": 3
>     },
>     {
>       "id": "n1",
>       "label": "Another node",
>       "x": 3,
>       "y": 1,
>       "size": 2
>     },
>     {
>       "id": "n2",
>       "label": "And a last one",
>       "x": 1,
>       "y": 3,
>       "size": 1
>     }
>   ],
>   "edges": [
>     {
>       "id": "e0",
>       "source": "n0",
>       "target": "n1",
>       "label" : "dfghujikoi"
>     },
>     {
>       "id": "e1",
>       "label" : "dfghujikoi",
>       "source": "n1",
>       "target": "n2"
>       
>     },
>     {
>       "id": "e2",
>       "source": "n2",
>       "target": "n0",
>       "label" : "dfghujikoi"
>     }
>   ]
> }
> 
> using python?
> 
> its like a hash table and value is an array of hash table ?
> I tried but it was giving error of "List out of index" .

(1) Was that something like

>>> [][1]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IndexError: list index out of range

? Please always copy and paste the traceback, don't rephrase.

(2) Show us the code that caused the error. If you provide some context it 
is easier for us to identify your problem. But if I were to guess: are you 
coming from a language where lists grow automatically? In Python they don't.

Instead of

mylist = []
for i in range(3):
   mylist[i] = 42 # WRONG, raises IndexError

you usually write

mylist = []
for i in range(3):
   mylist.append(42)

though in this particular case

mylist = [42] * 3

would work, too.