Save and load lists of strings in Python using JSON

Question

I am trying to save lists (one per line) in a file like

            w = meaningful_words
            json.dump(w, outfile)
            outfile.write("\n");

where w is a list of strings. Then I'm trying to load the lists, one at a time like

with open('text.txt', 'r') as file:
    for line in file:
        data = json.loads(line.read())

But I get the error

data = json.loads(line.read())
AttributeError: 'str' object has no attribute 'read'

Is there another way to do this? Found out JSON wood be easy to use but I can't get it to work.

use dumps not loads

burning
– burning

2016-05-31 10:10:11 +00:00
Commented May 31, 2016 at 10:10 — burning
– burning, Commented May 31, 2016 at 10:10

Jieter · Accepted Answer · 2016-05-31 10:27:49Z

1

You should change line.read() to just line:

with open('text.txt', 'r') as infile:
    for line in infile:
        data = json.loads(line)

File objects are iterators returning the next line if file.next() is called. The returned value is already a string and that's why you get the error message AttributeError: 'str' object has no attribute 'read'

edited May 31, 2016 at 10:27

answered May 31, 2016 at 10:12

Jieter

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2 Comments

Knokkelgeddon Over a year ago

Thank you! Can you tell me why?

Jieter Over a year ago

@Knokkelgeddon just edited my answer to include some explanation.

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