Python string.format KeyError

Question

This question has been answered before, but my string doesn't have any extra curly brackets that would mess up the formatting, so at the moment I'm completely clueless as to why the error

Error is KeyError : content

html = """
    <table class=\"ui celled compact table\" model=\"{model}\">
        {theaders}
        <tbody>
            {content}
        </tbody>
    </table>
    """
html = html.format(model=model)
html = html.format(content=data)
html = html.format(theaders=theaders)

Aside: The backslashes are not required in this example. Part of the benefit of triple-quoting a string is that any individual quote character is no longer special. — Robᵩ
– Robᵩ, Commented Dec 19, 2016 at 19:36
I just did them as part of trying to figure out the error :) — Mojimi
– Mojimi, Commented Dec 19, 2016 at 19:40

Jean-François Fabre · Accepted Answer · 2016-12-19 19:37:08Z

11

you could do it line by line using a dictionary and passing the dict as keyword arguments using **

d=dict()
d['model']=model
d['content']=data
d['theaders']=theaders

html = html.format(**d)

answered Dec 19, 2016 at 19:37

Jean-François Fabre♦

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Comments

hiro protagonist · Accepted Answer · 2016-12-19 19:30:48Z

7

you need to fill the values in one go:

html.format(model=model, content=data, theaders=theaders)

answered Dec 19, 2016 at 19:30

hiro protagonist

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8 Comments

Mojimi Over a year ago

is there no way of doing it in parts?

dhke Over a year ago

@Mojimi Not directly via str.format(). Template strings have this feature using safe_substitute() but with a different placeholder syntax. But why do you need it?

hiro protagonist Over a year ago

yes, you could. you'd need to surround content with double brackets; theaders with four brackets ({model}...{{content}}..{{{{theaders}}}}). a bit of a hack...

Mojimi Over a year ago

Template strings are the answer!

dhke Over a year ago

@Mojimi html = Template(html).safe_substitute(model=model); html = Template(html).safe_substitute(content=data). But I really would suggest the approach from @jean-françois-fabre 's answer

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