Reading JSON from a file?
I am getting a bit of headache just because a simple looking, easy statement is throwing some errors in my face.
I have a json file called strings.json like this:
"strings": [{"-name": "city", "#text": "City"}, {"-name": "phone", "#text": "Phone"}, ...,
{"-name": "address", "#text": "Address"}]
I want to read the json file, just that for now. I have these statements which I found out, but it's not working:
import json
from pprint import pprint
with open('strings.json') as json_data:
d = json.loads(json_data)
json_data.close()
pprint(d)
The error displayed on the console was this:
Traceback (most recent call last):
File "/home/.../android/values/manipulate_json.py", line 5, in <module>
d = json.loads(json_data)
File "/usr/lib/python2.7/json/__init__.py", line 326, in loads
return _default_decoder.decode(s)
File "/usr/lib/python2.7/json/decoder.py", line 366, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
TypeError: expected string or buffer
[Finished in 0.1s with exit code 1]
Edited
Changed from json.loads
to json.load
and got this:
Traceback (most recent call last):
File "/home/.../android/values/manipulate_json.py", line 5, in <module>
d = json.load(json_data)
File "/usr/lib/python2.7/json/__init__.py", line 278, in load
**kw)
File "/usr/lib/python2.7/json/__init__.py", line 326, in loads
return _default_decoder.decode(s)
File "/usr/lib/python2.7/json/decoder.py", line 369, in decode
raise ValueError(errmsg("Extra data", s, end, len(s)))
ValueError: Extra data: line 829 column 1 - line 829 column 2 (char 18476 - 18477)
[Finished in 0.1s with exit code 1]
The json.load()
method (without "s" in "load") can read a file directly:
import json
with open('strings.json') as json_data:
d = json.load(json_data)
print(d)
You were using the json.loads()
method, which is used for string arguments only.
Edit: The new message is a totally different problem. In that case, there is some invalid json in that file. For that, I would recommend running the file through a json validator.
There are also solutions for fixing json like for example How do I automatically fix an invalid JSON string?.
Here is a copy of code which works fine for me
import json
with open("test.json") as json_file:
json_data = json.load(json_file)
print(json_data)
with the data
{
"a": [1,3,"asdf",true],
"b": {
"Hello": "world"
}
}
you may want to wrap your json.load line with a try catch because invalid JSON will cause a stacktrace error message.
The problem is using with statement:
with open('strings.json') as json_data:
d = json.load(json_data)
pprint(d)
The file is going to be implicitly closed already. There is no need to call json_data.close()
again.
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