jinja2 how to remove trailing newline

Solution 1:

Change your loop to strip whitespace from the top AND bottom of the output (notice extra - at the for loop close):

{% for key, value in querystring.items() -%}
  {{ key }}: '{{ value }}'
{%- endfor %}

In my tests (using https://github.com/abourguignon/jinja2-live-parser), the - must come after the first {%, not before the last to achieve what you're asking for.

Docs: https://jinja.palletsprojects.com/en/latest/templates/#whitespace-control

Solution 2:

I think you can get rid of it using the whitespace control feature. Thus I would modify the endfor block to {% endfor -%}

See if that does it!

Solution 3:

For those using Flask who arrive here, these lines did the trick for me:

app = Flask(__name__)
app.jinja_env.lstrip_blocks = True
app.jinja_env.trim_blocks = True

Solution 4:

I found a way to solve this problem:

- request:
    path: {{ path }}
    headers:
      origin: 'somedomain.com'
      user-agent: 'agent'
      referer: 'some.domain.com'
      authority: 'somedomain.com'
    querystring: >-
      {% for key, value in querystring.items() -%}
      {{ key }}: '{{ value }}'
      {% endfor %}
  response:
    content:
      file: {{ content }}

• >, |: "clip": keep the line feed, remove the trailing blank lines.
• >-, |=: "strip": remove the line feed, remove the trailing blank lines.
• >+, |+: "keep": keep the line feed, keep trailing blank lines.

Thx Steve Bennett's post: In YAML, how do I break a string over multiple lines?

Solution 5:

The accepted answer is only half of the solution, because it removes all newlines.

You can avoid the trailing newline by first removing all newlines (using the minus signs at -%} and {%- in the for loop), and then inserting the desired newlines at the right place (using the loop.last condition).

The following templates renders a dictionary, d, to as JSON text:

{
    {% for key, value in d.items() -%}
    "{{ key }}": "{{ value }}"{{ ",
    " if not loop.last }}
    {%- endfor %}
}

For d = {'a':'1', 'b':'2'}, the template renders to

{
    "a": "1",
    "b": "2"
}