Evaluate Constant Argument State Property

If Python is in the "begin_expr" state at time t, and the current expression is constant c, and there is a parent expression, then the state is updated to "return." More formally:

When there is a parent expression and potentially other arguments remaining to evaluate, the state is updated to "return." If there isn't a parent expression, the state would change to "end_expr" and expression evaluation ends.

For example, if the following are true:

• the expression at time 4 = 5
• expression state at time 4 = "begin_expr"
• parent stack at time 4 = [ __add__(5, 2), [ ] ]

then expression state at time (4 + 1) = "return"

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

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