Resetting the Expression Stack

When expression evaluation is finished, the Expression Stack will always have 1 element: an empty stack. The Values Stack will contain the computed value.

Next, LW Python will simply pop the Expression Stack to reset it. More precisely,

An empty Expression Stack indicates that LWPS is no longer evaluating an expression (thus it is ready to begin another expression).

For example,

if Expression Stack at time 5 = [ [ ], [ ] ], then Expression Stack at time 6 = [ ]

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