Extract specific words from String in python

Question

I want to extract all the words that are before "indices" (i.e ForeverTrophyless, NoPainNoGame, Prize) and put em all inside a list. How Can I do that?

foo = '[{"text":"ForeverTrophyless","indices":[0,18]},{"text":"ForeverTrophyless","indices":[19,37]},{"text":"Prize","indices":[38,56]},{"text":"ForeverTrophyless","indices":[57,75]},{"text":"NoPainNoGame","indices":[76,94]},{"text":"ForeverTrophyless","indices":[95,113]},{"text":"ForeverTrophyless","indices":[114,132]}]'

Python2.7

Pycharm Ubuntu 14.04

[x['text'] for x in foo]. Also, there's no such thing like "before" in dictionaries, because they're unordered. — vaultah
– vaultah, Commented Jul 10, 2014 at 17:58
@vaultah Sorry friend I forgot the ' ' in my question, foo is a string — Juan David
– Juan David, Commented Jul 10, 2014 at 18:00

Cory Kramer · Accepted Answer · 2014-07-10 18:04:11Z

You can use ast.literal_eval to turn that string into a list of dictionaries.

foo = '[{"text":"ForeverTrophyless","indices":[0,18]},{"text":"ForeverTrophyless","indices":[19,37]},{"text":"Prize","indices":[38,56]},{"text":"ForeverTrophyless","indices":[57,75]},{"text":"NoPainNoGame","indices":[76,94]},{"text":"ForeverTrophyless","indices":[95,113]},{"text":"ForeverTrophyless","indices":[114,132]}]'

import ast
l = ast.literal_eval(foo)

l is now:

[{'indices': [0, 18], 'text': 'ForeverTrophyless'},
 {'indices': [19, 37], 'text': 'ForeverTrophyless'},
 {'indices': [38, 56], 'text': 'Prize'},
 {'indices': [57, 75], 'text': 'ForeverTrophyless'},
 {'indices': [76, 94], 'text': 'NoPainNoGame'},
 {'indices': [95, 113], 'text': 'ForeverTrophyless'},
 {'indices': [114, 132], 'text': 'ForeverTrophyless'}]

Then use a list comprehension

[i['text'] for i in l]

Result

['ForeverTrophyless', 'ForeverTrophyless', 'Prize', 'ForeverTrophyless', 'NoPainNoGame', 'ForeverTrophyless', 'ForeverTrophyless']

vaultah · Accepted Answer · 2014-07-10 18:09:14Z

2

foo appears to be a valid serialized JSON object. You can parse it with json.loads and then retrieve all text fields inside a list comprehension:

In [8]: from json import loads

In [9]: [x['text'] for x in loads(foo)]
Out[9]: 
['ForeverTrophyless',
 'ForeverTrophyless',
 'Prize',
 'ForeverTrophyless',
 'NoPainNoGame',
 'ForeverTrophyless',
 'ForeverTrophyless']

edited Jul 10, 2014 at 18:09

answered Jul 10, 2014 at 18:03

vaultah

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1 Comment

Juan David Over a year ago

Yes, is part of a JSON object. Thanks for your help, You're right!

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