CODEWITHSUNDEEP
pythonapidictionary
Marks Gniteckis
Marks Gniteckis

Reputation: 473

Fetching data from API gives TypeError: unhashable type: 'dict'

I am trying to prototype business data analysis application in Python 2.7. The code is:

import urllib2
import json

url = 'http://dev.c0l.in:8888'
api = urllib2.urlopen(url)
data = json.load(api)

for item in data:
    print item[{'sector':'technology'}]

It has to get the data from API and print out names of technology companies only. Instead of that I get 

Traceback (most recent call last):
  File "C:\Users\gniteckm\Desktop\all2.py", line 9, in <module>
    print item[{'sector':'technology'}]
TypeError: unhashable type: 'dict'

Upvotes: 0

Views: 739

Answers (1)

Martijn Pieters
Martijn Pieters

Reputation: 1124318

You cannot filter dictionaries; they don't take a query. You'll have ta pass in keys that actually exist in the item dictionaries, and because this is JSON, item will only have string keys.

You can filter on specific key-value pairs with an if statement:

for item in data:
    if item['sector'] == 'technology':
        print item

This assumes that all item dictionaries in data have a 'sector' key. If not, use dict.get() to return a default if the key is missing:

for item in data:
    if item.get('sector') == 'technology':
        print item

Upvotes: 1

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