[Zope] Calling Page Template with Dictionaries

[Roy Rapoport]

We know we can do this:
python script:
foo='bar'
return context['page_template'](arg=foo)

and in page_template:
Hello, arg is <p tal:content="string:${options/arg}"></p>

What I'm hoping to find out, though, is whether I could call a ZPT with a
dictionary.
My initial effort:
PS:
d = {}
d['arg'] = 'bar'
return context['page_template'](d)

page_template:
Hello, arg is <p tal:content="string:${options/arg}"></p>

Resulted in 
Error Type: Undefined
Error Value: arg not found in 'options/arg', at line 12, column 11

Suggestions?

-roy

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