json.dumps() not working

Question

import json def json_serialize(name, ftype, path): prof_info = [] prof_info.append({ 'profile_name': name, 'filter_type': ftype }) with open(path, "w") as f: json.dumps({'profile_info': prof_info}, f) json_serialize(profile_name, filter_type, "/home/file.json")

The above code doesn't dumps the data into the "file.json" file. When I write print before json.dumps(), then the data gets printed on the screen. But it doesn't get dumped into the file.

The file gets created but on opening it (using notepad), there is nothing. Why?

How to correct it?

senshin · Accepted Answer · 2014-01-30 10:08:34Z

This isn't how json.dumps() works. json.dumps() returns a string, which you must then write into the file using f.write(). Like so:

with open(path, 'w') as f: json_str = json.dumps({'profile_info': prof_info}) f.write(json_str)

Or, just use json.dump(), which exists exactly for the purpose of dumping JSON data into a file descriptor.

with open(path, 'w') as f: json.dump({'profile_info': prof_info}, f)

Waqas · Accepted Answer · 2014-04-04 08:35:09Z

Simply,

import json my_list = range(1,10) # a list from 1 to 10 with open('theJsonFile.json', 'w') as file_descriptor: json.dump(my_list, file_descriptor)

gioi · Accepted Answer · 2014-01-30 10:08:01Z

You need to use json.dump. json.dumps returns a string, it doesn't write to a file descriptor.

Silver · Accepted Answer · 2020-08-13 12:09:13Z

Also check that your output file path is a relative path.

output_json_path = '../Desktop/test_folder/test.json' #This works # output_json_path = '~/Desktop/test_folder/test.json' #This does not work with open(output_json_path, 'w+', encoding='utf8') as f: json.dump({l1 : tagging_dictionary}, f, ensure_ascii = False)

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