Function Call Returned Rule

If the state is "call_returned" and the parent stack is empty at time t, then at time t + 1, the state is "end_expr." More formally,

After Python has returned from the function body, the function call has finished. If the parent stack is empty, this was a top-level function call, so the expression has finished.

If the parent stack was not empty, then the returned value from the function call is used as an argument to a parent function call, and the expression evaluation continues.

For example,

if the following are true:

• expression state at time 25 = "call_returned"
• parent stack at time 25 = [ ]

then expression state at time (25 + 1) = "end_expr"

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

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