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Array of hash table

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  Array of hash table jyoti690saini@gmail.com - 2015-01-08 23:17 -0800
    Re: Array of hash table Dave Angel <davea@davea.name> - 2015-01-09 02:30 -0500
    Re: Array of hash table Peter Otten <__peter__@web.de> - 2015-01-09 08:55 +0100
    Re: Array of hash table Jason Friedman <jsf80238@gmail.com> - 2015-01-09 20:38 -0700

#83406 — Array of hash table

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" .

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#83408

On 01/09/2015 02:17 AM, 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" .
>

You just did.  If you'd like to see it, add a print(graph) .  What's 
your real question?

BTW, in Python, it's called a dict, not a hash table.  But you did it 
correctly.

And if you want to fetch a particular element, use:

print(graph["edges"][1]["id"])

-- 
DaveA

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#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.

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#83601

>    Can any one tell me how to create
>    graph={
>   "nodes": [
>     {
>       "id": "n0",
>       "label": "A node",
>       "x": 0,
[ ... elided ... ]
>     }
>   ]
> }


Taking a guess and guessing that graphviz might be useful for you:
https://code.google.com/p/pydot/.

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