Evaluate Variable Argument State Property

If Python is in the "begin_expr" state at time t, and the current expression is variable x, and there is a parent expression, then at time t + 1, the state is "return." More formally:

if the following are true:

  • expression state at time t = "begin_expr"
  • the expression at time t = x
  • x is a variable
  • parent stack at time t = [ y, z ]

then expression state at time (t + 1) = "return"

A variable is evaluated in 1 step (look up the variables map). Next, Python will try to evaluate other arguments, if any.

For example,

if the following are true:

  • the expression at time 5 = x
  • expression state at time 5 = "begin_expr"
  • x is a variable
  • parent stack at time 5 = [ __add__(x, 3), [ ] ]

then expression state at time (5 + 1) = "return"

Try stepping through the simulator to see the "Expression State" change to "return."

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