Can I iterate all values in dict object in a chameleon template?
I made view callable return dict object named "params", which contains all
parameter key/value pairs and
chose to use chameleon template as a renderer.
I wanted to iterate every key and value pairs of "params" in the template
file, but couldn't find how to do that.

the following code worked well while just displaying "params"' keys:
<li tal:repeat="key settings.keys()" tal:content="key"></li>

But this code raised an exception saying "'NoneType' object is not
callable":
<li tal:repeat="key settings.keys()" tal:content="settings[key]"></li>

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