Running a report for trailing 7 days, not just current week

[Andrew McGinnis]

I'm trying to get a template modified to pull data from essentially $span(week_delta=1).  There's two sections in the template, one a valuesCard(), the other is chartCard().  The logic of the template goes like this:
<main>
  <div class="container-fluid d-flex-xxl">

    <div class="row my-4 temprow align-content-start">
      #for $x in $Extras.Appearance.values_order

      #if $x == "ET"
        #if $span(week_delta=1).ET.has_data and $span(week_delta=1).ET.sum.raw is not None and $span(week_delta=1).ET.sum.raw > 0.0

          $valuesCard('ET')
        #end if
      #else
        $valuesCard($x)
      #end if

      #end for
    </div>

    <hr class="my-4 rowdivider">

    <div class="row mt-5 mb-4 graphrow align-content-start">
      #for $x in $Extras.Appearance.charts_order

      #if $x == "ET"
        #if $week.ET.has_data and $week.ET.sum.raw is not None and $week.ET.sum.raw > 0.0
          $chartCard($x, $x + 'chart')
        #end if
      #else
        $chartCard($x, $x + 'chart')
      #end if

      #end for
    </div>

  </div>
</main>

The charts code runs a for loop that uses 

#for $record in $span($week_delta=1).spans(interval=current_interval)

But the valuesCard does not.  Everything is referenced via some form of $getVar('week.' + name + '.aggregation').  Here's the code:
#def valuesCard($name)
  #if $getVar('week.' + name + '.has_data')

        #if $name == specific thing

        ...

        #else

        <div class="row">
          <div class="col-3 text-muted font-small lo-text">
            $getVar('week.' + name + '.min') <br>
            ($getVar('week.' + name + '.mintime').format($Extras.Formatting.datetime))
          </div>
          <div class="col-6">
            <h4 class="h2-responsive">$getVar('week.' + name + '.avg')</h4>
          </div>
          <div class="col-3 text-muted font-small hi-text">
            $getVar('week.' + name + '.max') <br>
            ($getVar('week.' + name + '.maxtime').format($Extras.Formatting.datetime))
          </div>
        </div>

for any of the 'specific thing' items, I can hardcode $span(week_delta=1).obs.aggregation.  But the #else block will not evaluate using $span, or $timespan via a specific '#set timespan = $span(week_delta=1)' within the def block.  $week(weeks_ago=1) doesn't do what I want in terms of trailing 7 days, but even that one wasn't getting it done when I went to just make a second template for lastweek.html.tmpl....  I've tried doing $getattr("$timespan", "$name").agg without success, as well as stripping the quotes to just be $getattr($timespan, $name).agg, stil without success.

Is there a simple enough way to run a template that will pull values from a $span() timeframe, without individually coding every observation?

[Andrew McGinnis]

Didn't get the magic google-fu until after I posted.  There's a very specific example shown for exactly what I wanted to do at https://weewx.com/docs/5.1/custom/sle/#adding-tag-seven_day.  

Now, I'd like to do a "Last Week" page for $week(weeks_ago=1), just to have the two.  But I'll mess with that later.