CODEWITHSUNDEEP
pythonjson
Paul Joireman
Paul Joireman

Reputation: 2835

Python json dump

I have a JSON file that looks like this:

{"environment": "production", 
 "classes": 
    {"nfs::server": {"exports": ["/srv/share1","/srv/share3"]}}
}

When I run the following code using Python 3.6

fp=open('example.json', 'r')
data=json.load(fp)

print(50*'-')
print(json.dumps(data, indent=4))
print(50*'-')
json.dump(data, sys.stdout, indent=4)

I get the output:

--------------------------------------------------
{
    "environment": "production",
    "classes": {
        "nfs::server": {
            "exports": [
                "/srv/share1",
                "/srv/share3"
            ]
        }
    }
}
--------------------------------------------------
{
    "environment": "production",
    "classes": {
        "nfs::server": {
            "exports": [
                "/srv/share1",
                "/srv/share3"
            ]
        }
    }
}%

My question is why is the extra % included in the json.dump output compared to the json.dumps string? It is not an artifact of the OS because if I provide a file object instead of sys.stdout it also gets written to the file.

Upvotes: 5

Views: 21902

Answers (2)

yota
yota

Reputation: 2220

The last % is the first character of your console prompt line or a feature of your shell (https://unix.stackexchange.com/questions/167582/why-zsh-ends-a-line-with-a-highlighted-percent-symbol)

Nothing to do with json, nor python.

Because, when print() add a '\n' at the end, the dump to stdout doesn't

Upvotes: 4

Apalala
Apalala

Reputation: 9224

The reason is that print(json.dumps(data, indent=4)) prints a newline, and json.dump(data, sys.stdout, indent=4) does not.

You can try adding a print() at the end:

print(50*'-')
print(json.dumps(data, indent=4))
print(50*'-')
json.dump(data, sys.stdout, indent=4)
print()

Is the % symbol part of your shell's prompt?

Upvotes: 3

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