[Zope] Why does calling python scripts with and without quotes have a different resulting namespace ?

[Russell Fine]

In DTML, when I call a script (let's call is S) using <dtml-var S> the script receives the DTML namespace as "_".  However, when I call it using <dtml-var "S()"> the script seems to getting an empty namespace.  Aren't these two identical ?
 
Russell Fine
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