Evaluate Constant State Property

If Python is in the "begin_expr" state at time t, and the current expression is constant c, and there are no ancestor expressions, then the state is updated to "end_expr." More formally:

if the following are true:

  • expression state at time t = "begin_expr"
  • the expression at time t = c
  • c is constant
  • parent stack at time t = [ ]

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

Whenever an expression has finished evaluating, the state is updated to "end_expr."

For example,

if the following are true:

  • the expression at time 1 = 8
  • expression state at time 1 = "begin_expr"
  • 8 is constant
  • parent stack at time 1 = [ ]

then expression state at time (1 + 1) = "end_expr"

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

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