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How to apply "format" on a list of strings? #545

htgoebel opened this issue Feb 16, 2016 · 4 comments

How to apply "format" on a list of strings? #545

htgoebel opened this issue Feb 16, 2016 · 4 comments


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I try to do something like in Python

("db.%s.dump" % n for n in names)

I tried

{{ databases | map("format", "db.%s.dump") }}
{{ "db.%s.dump" | map("format", databases) }}

and a lot more. All I tried failed.

The documentation is of no help :-(

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why not {% for n in names %} {{ "db.%s.dump"|format(n) }} {% endfor %}?

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@NormanDenayer it's fine unless you want to pass it to another filter in map().

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Personally I ended with writing own plugin:

from jinja2.utils import soft_unicode

def format_string(text, fmt, *kw):
    return soft_unicode(fmt).format(text, *kw)

class FilterModule(object):
    def filters(self):
        return dict(format_string=format_string)


list_of_names | map('format_string', 'hello {}!')

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davidism commented Nov 4, 2019

See #906 (comment) for why I'm declining this. It also contains a filter that could accomplish this, or you can write a more specific filter as shown above.

@davidism davidism closed this as completed Nov 4, 2019
@github-actions github-actions bot locked as resolved and limited conversation to collaborators Nov 13, 2020
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