Iterate Over Python Dictionary Using TAL in Plone

How to iterate over a Python dictionary in Plone using a tal:repeat statement

The following code will take a form POST request (dictionary) and iterate over it to display each field and value in a definition list (<dl />). 

    <div tal:define="form python:context.REQUEST.form">
      <dl>
        <tal:block tal:repeat="field form">
           <dt tal:content="field" />
           <dd tal:content="python:form[field]" />
        </tal:block>
      </dl>
    </div>