Python "with open" statement creates file with directory as name, but not in the actual directory

Question

I want to save JSON-data to a (before not existing) file using the following code, which works with Python 3.6.5:

with open("Samples\\{}.json".format(id), "w", encoding="utf-8") as f:
    json.dump(labels, f, ensure_ascii=False, indent=4)

This will create a new .json file in the folder Samples.
Now I tried the same with Python 3.7.3, but instead of creating a new .json file in said directory, it creates a file with a name like "Samples\xyz.json" in the directory the python code is running (running in a jupyter notebook).

I tried the following already, but it results in the same problem creating a file with the directory as file name:

f = open(os.path.expanduser(os.path.join("Samples/{}.json".format(document_id)))
json.dump(labels, f, ensure_ascii=False, indent=4)

How can I create a new .json file in the desired directory with Python 3.7.3?

you are using join incorrectly.. it should be join('Examples', '{}.json'.format(doc)) — johnashu
– johnashu, Commented Apr 23, 2020 at 11:33
@johnashu I get an error "[Errno 2] No such file or directory" since the .json doesn't exist before — Colle
– Colle, Commented Apr 23, 2020 at 11:41

rasjani · Accepted Answer · 2020-04-23 11:42:21Z

3

with pathlib & f-string:

from pathlib import Path
document_id = 100 # Random id here ...
sample_file = Path("Samples") / f"{document_id}.json"
sample_file.parent.mkdir(exist_ok=True)
with sample_file.open("w", encoding="utf-8") as f:
    json.dump(labels, f, ensure_ascii=False, indent=4)

answered Apr 23, 2020 at 11:42

rasjani

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