CODEWITHSUNDEEP
pythondictionarypython-2.7
Wiz
Wiz

Reputation: 307

Iterating over dictionary containing array objects in python

So I'm trying to iterate over a dictionary object in python and all I'm getting is list out of index error. Here is what my list looks like - 

test_list = {"1":[{"1":[{"a":"100","b":"200"}],"2":[{"a":"300","b":"400"}]}]}

And here is the code - 

for counter in range(len(test_list)):
            print test_list['1'][counter]

Any idea why am I getting that error?

EDIT: I want to access all of a & b elements in test_list

Upvotes: 0

Views: 4171

Answers (5)

Aman
Aman

Reputation: 47199

Nested dicts within lists, awesome.

I did the following, which can be modified to access the items needed. 

In [21]: inside_dict = test_list['1'][0]

In [22]: for key,val in inside_dict.items():
    print '{} contains'.format(key)
    for key2, val2 in val[0].items():
        print '\t{}: {}'.format(key2, val2)
Out[22]:
1 contains
        a: 100
        b: 200
2 contains
        a: 300
        b: 400

Upvotes: 1

raton
raton

Reputation: 428

    python 3.2

    t = {"1":[{"1":[{"a":"100","b":"200"}],"2":[{"a":"300","b":"400"}]}]}
    res=[v["a"] for x in t.values() for p in x for y in p.values() for v in y] # values for a

Upvotes: 1

Wiz
Wiz

Reputation: 307

So here is the answer

for key, val in test_list['1'][0].items():
    print key, val[0]['a']
    print key, val[0]['b']

Upvotes: 0

Nips
Nips

Reputation: 13870

for k,v in test_list.items():
    print v[0]['1']

Ok, maybe this help:

for c in test_list:
    for v in test_list[c]:
            print v['1']
            print v['2']

Upvotes: 1

BrenBarn
BrenBarn

Reputation: 251408

Your code doesn't raise an error for me. If you want the first a and b elements, you would need:

for key, val in test_list['1'][0]['1'][0].items():
    print key, val

Needless to say, that is rather convoluted. What you have is a dictionary in a list in a dictionary in a list in a dictionary. Why are you using this data structure? There is almost certainly a simpler way to represent your data.

Upvotes: 1

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