Begin Constructor Parent Property

Evaluating an object constructor is very similar to evaluating a function call. LW Python starts by pushing the expression to the parent stack. More formally,

if the following are true:

  • expression state at time t = "begin_expr"
  • the expression at time t = Python constructor with name: class_name and arguments: args

then parent stack at time (t + 1) = [ Python constructor with name: class_name and arguments: args, parent stack at time t ]

For example,

if the following are true:

  • expression state at time 9 = "begin_expr"
  • the expression at time 9 = Person("John", "Smith", 25)

then parent stack at time (9 + 1) = [ Person("John", "Smith", 25), parent stack at time 9 ]

Try stepping through the simulator to see LW Python push the constructor to the parent stack.

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