How to write simplejson in python 2.4

Question

I have an issue where I need to use simplejson to write some dictionaries to file using python 2.4 (yes, we're actively trying to upgrade; no, it's not ready yet).

Python 2.4 cannot use the syntax:

with open('data.txt', 'w') as outfile: json.dumps(data, outfile)

and I cannot find the correct syntax anywhere. If I try using this:

sov_filename = 'myfile.txt' sov_file = open( sov_filename, 'w' ) filecontents = json.dumps( sov_file )

nothing happens. The file is created, but nothing is in it.

So, does anybody know how to do this for python 2.4?

In the first example, you are using json.dumps (a write activity) and in the second you are using json.loads (a read activity on a file you have opened for writing). Did you mean to do this? — erewok
– erewok, Commented Jun 17, 2015 at 21:26

Delimitry · Accepted Answer · 2015-06-17 21:49:10Z

1

To save JSON to file use json.dump:

sov_filename = 'myfile.txt' sov_file = open(sov_filename, 'w') json.dump(data, sov_file)

edited Jun 17, 2015 at 21:49

answered Jun 17, 2015 at 21:31

Delimitry

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4 Comments

roninveracity Over a year ago

I'm trying to write to the file--my original post had a copy/paste problem. This will try to read a file that doesn't exist.

roninveracity Over a year ago

And this does not work. Regardless of using dump or dumps, the file will be created, but nothing is in it.

Delimitry Over a year ago

What kind of data do you put to dump?

muratgu Over a year ago

@roninveracity, you are closing the file right? (e.g. sov_file.close())

Erin Call · Accepted Answer · 2015-06-17 21:52:29Z

The with syntax is syntactic sugar. The desugared equivalent is:

outfile = open('data.txt', 'w') try: json.dump(data, outfile) finally: outfile.close()

I'm not sure why simplejson isn't writing to the file, but you can work around that as well, by replacing json.dump(data, outfile) with outfile.write(json.dumps(data))

roninveracity · Accepted Answer · 2015-06-17 22:03:29Z

I simply needed to close() it. I had it in the code, but was exiting before it executed. I was accustomed to this not being necessary because I was using the csv writer in a python 2.7 script, for which the lines appear in the file without explicitly closing.

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