CODEWITHSUNDEEP
pythonstringpython-3.xlistdictionary
unseen_damage
unseen_damage

Reputation: 1376

Convert String to List of Dictionaries Python 3

I have a piece of information like so: 

[{"city": "Beverly Hills", "state": "", "postal_code": "", "address": "Some Address", "country": "USA"}, {"city": "New York", "state": "NY", "postal_code": "", "address": "P.O. BOX 52404", "country": "USA"}]

When I do type() it shows as <class 'str'>.

How do I get this information from a string to a list of dictionaries in Python 3?

I've tried literal_eval and got an error malformed node or string:, so I am not sure what the best way to do this is.'

EDIT

Here is an example that should be reproducible:

mydata = {'programs': '["France"]', 'ids': '[]', 'citizenships': '[]', 'nationalities': '["FR"]', 'places_of_birth': '[]', 'dates_of_birth': '["1973-03-25"]', 'addresses': '[{"state": null, "postal_code": null, "address": null, "city": null, "country": "FR"}]'}
for key,value in mydata.items():
    if type(value) is str:
        result = literal_eval(value)
        print("value 1: ", value)
        print("value type 2:", type(value))
        print("result 3: ", result)
        print("result  4: ", type(result))
        for item in result:
            print("item in result 5:", item)
            print("type of item in result 6:", type(item))

Here is the error:

File "server.py", line 137, in insert_in_db result = literal_eval(value)
File "/Users/user/anaconda3/envs/apicaller/lib/python3.5/ast.py", line 84, in literal_eval return _convert(node_or_string)
File "/Users/user/anaconda3/envs/apicaller/lib/python3.5/ast.py", line 57, in _convert return list(map(_convert, node.elts))
File "/Users/user/anaconda3/envs/apicaller/lib/python3.5/ast.py", line 62, in _convert in zip(node.keys, node.values))
File "/Users/user/anaconda3/envs/apicaller/lib/python3.5/ast.py", line 61, in return dict((_convert(k), _convert(v)) for k, v
File "/Users/user/anaconda3/envs/apicaller/lib/python3.5/ast.py", line 83, in _convert raise ValueError('malformed node or string: ' + repr(node)) ValueError: malformed node or string: <_ast.Name object at 0x109baae48>

Maybe I am missing a step in between to check for null values? I seem to get the error on the eval line 137. I got the idea to use ast.literal_eval from that stack overflow comment mentioned below.

Is it more of a data issue than with the way I am handling it? I am not very familiar with Python so I am most likely missing something.

Upvotes: 12

Views: 24958

Answers (5)

Shubhank Gupta
Shubhank Gupta

Reputation: 825

There is JSON encoder and decoder. You can have a look at here for documentation. json.loads(<to_be_convert_string>)

Python3 example and its output

import json
data = json.loads('["foo", {"bar":["baz", null, 1.0, 2]}]')
print(data) # ['foo', {'bar': ['baz', None, 1.0, 2]}]
print(type(data)) # <class 'list'>
print(type(data[0])) # <class 'str'>
print(type(data[1])) # <class 'dict'>

You can have more examples at this link

Upvotes: 1

Deepak Joshi
Deepak Joshi

Reputation: 329

I know i'm answering pretty late but hope it is helpful for other folks:

you can use: pip install pyyaml import yaml

x = '[{"city": "Beverly Hills", "state": "", "postal_code": "", "address": "Some Address", "country": "USA"}, {"city": "New York", "state": "NY", "postal_code": "", "address": "P.O. BOX 52404", "country": "USA"}]'

x = yaml.load(x)

Now string has been converted to list of dictionaries.

Upvotes: 8

lambda
lambda

Reputation: 417

You can use json module, if you your informating is of type string 

import json

data = json.loads(<your_string>)

for element in data:
    for key, value in element.items():
        print("{}: {}".format(key, value))

Upvotes: 4

spitfire21
spitfire21

Reputation: 103

That is of type list?

You should be able to set a variable to that list and it should work. However, if the data is a literal string you could do this:

import json
test = json.loads('[{"city": "Beverly Hills", "state": "", "postal_code": "", "address": "Some Address", "country": "USA"}, {"city": "New York", "state": "NY", "postal_code": "", "address": "P.O. BOX 52404", "country": "USA"}]')

print(type(test))
-><type 'list'>

Upvotes: 0

dimmg
dimmg

Reputation: 3815

import json

data = json.loads(<your_string>)

Upvotes: 20

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