As explained in the book I can modify a fields class by setting _class as 
follows:

form.custom.widget.some_field['_class']="input-block-level

however when I iterate form.cutom.widget as in following snippet:

{{for field in form.custom.widget:}}
{{=SPAN(form.custom.label[field])}}
{{form.custom.widget[field]["_class"]  = "some-sample-class"}}
{{=form.custom.widget[field]}}
{{pass}}

TypeError is raised when I try to set _class, since 
form.custom.widget[field] is a str instance.

How can I overcome this, do you have any suggestions?

-- 
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