CODEWITHSUNDEEP
pythonpython-2.7python-3.xyamljinja2
user2942227
user2942227

Reputation: 1023

python Jinja2 creating a file from json template using yaml conf

I am writing a function to render json template using yaml config file.

It looks something like below :

render.py:

if len(sys.argv) != 3:
    print "usage: python render_template.py [yaml_file] [jinja_template_file]"
    sys.exit(1)

with open(sys.argv[1], "r") as stream:
    config = yaml.safe_load(stream)
with open(sys.argv[2], "r") as stream:
    template_text = stream.read()
template = Template(template_text)

print template.render(config)

test.yaml:

    Application:
          Hosts:
              - a
              - b

sample.json.templete

     [{
"test1": 
{

                  "objectName": "{{Application.Hosts}}",

                 }


}]

when I run 

   python ./render.py ./test.yaml ./sample.json.templete > sample.json

I get 

   [{
"test1": 
{

                  "objectName": ['a' , 'b'],

                 }


}]

But since I am generating a json file I need

     ["a", "b"]

I.e. I want the list in double quotes. How do I best achieve it? How do I convert list with strings in single quotes to list with strings in double quotes?

Upvotes: 1

Views: 4032

Answers (2)

user2942227
user2942227

Reputation: 1023

This would work

["{{Application.Hosts|join('","')}}"]

We don't need to make any custom filters

Upvotes: 1

srowland
srowland

Reputation: 1705

You could use a custom filter function in your template to format lists just the way you want them. You could then use this function for any list you want to format.

A good SO question/answer with some great info on creating a jinja2 filter to use with an iterable (e.g. your list) is available here

Then your json template can use the filter like this:

    "objectName": "{{ Application.Hosts|format_list }}",

Your filter would most likely do something like this:

def format_list(my_list):
    formatted_list = ", ".join(["%s" % item for item in my_list]) 
    return "[%s]" % formatted_list

Upvotes: 1

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