Inverted Index Python

Question

I'm trying to create a dictionary of the form:

{: [ , {}]}

For example:

d = {term: [number, {number1: number2}]}

I tried to create the dictionary inside but I'm new and I couldn't understand how it's possible. The problem is that I want the form of d and I want to update number or the dictionary that contains number1 as key and number2 as value when finding term.

So the question is: Is it possible to create a dictionary like d ? And if so, how can I access term, number and the inside dictionay?

kantal · Accepted Answer · 2018-11-19 17:23:10Z

1

d = {"term": [5, {6: 7}]}

The key's value is a list:

d["term"]   
[5, {6: 7}]

The list 's 1st element:

d["term"][0]
5

The list 's second element is a dictionary:

d["term"][1]
{6: 7}

The value of the dictionary's key '6' is 7:

d["term"][1][6]
7

Edit: Some examples for modification:

d = {"term": [5, {6: 7}]}

d["term"].append(10)
print(d)
Out: {'term': [5, {6: 7}, 10]}

l=d["term"]
l[0]=55
print(d)
Out: {'term': [55, {6: 7}, 10]}

insidedict=l[1]
print(insidedict)
{6: 7}

insidedict[66]=77
print(d)
{'term': [55, {6: 7, 66: 77}, 10]}

edited Nov 19, 2018 at 17:23

answered Nov 19, 2018 at 15:27

kantal

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1 Comment

Devilhorn Over a year ago

If I have multiple keys ,say term , term1 , termk how can I add values in the inside dictionary of term or update term's numbers or update term's inside dictionary ?

jpp · Accepted Answer · 2018-11-19 14:34:57Z

1

Sure, just define it as you have:

d = {'term': [5, {6: 7}]}

Since your dictionary has just one key, you an access the key via:

key = next(iter(d))

You can then access the value 5 via a couple of ways:

number = d[key][0]
number = next(iter(d.values()))[0]

Similarly, you can access the inner dictionary via either:

inner_dict = d[key][1]
inner_dict = next(iter(d.values()))[1]

And repeat the process for inner_dict if you want to access its key / value.

answered Nov 19, 2018 at 14:34

jpp

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5 Comments

Devilhorn Over a year ago

First, I would like to create an empty dictionary of the form {: [ , {}]} . Can you show me an example ?

jpp Over a year ago

@Devilhorn, Just instantiate it with d = {'': [0, {0: 0}]}, though I'm not sure why this is helpful. Python isn't strongly typed, you don't need to define in advance the type of every key and value.

Devilhorn Over a year ago

Thank's @jpp , I instantiated it outside the loop I'm using it with the first values I need and it worked perfectly. As for the empty dictionary I was curious to find a way for educational purposes..

Devilhorn Over a year ago

I have another problem, how can I get only the keys of the inside dictionary. For instance: say inside dictionary is :{name1:5,name2:2,name3:7} I need to check if name4 is in the inside dictionary as key , if not add it with empty value . So the dictionary in that case would be: inside dict is: {name1:5,name2:2,name3:7,name4:''} else if name4 is in dictionary it would remain the same.

Devilhorn Over a year ago

I found that if I reach inside dict with: d[term][1].keys() I get all the keys but I don't know how to continue

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