Proofs

• the line at time 34 = 4
• the tab at time 34 = 2
• statement at line 4, tab 2 = self."last_name" = last_name
• Class Map at time 34 = [ entry "Person": [ entry "bases": [ ], [ entry "methods": [ entry "__init__": [ entry "params": [ self, [ first_name, [ last_name, [ age, [ ] ] ] ] ], [ entry "line": 2, [ ] ] ], [ entry "age_in_months": [ entry "params": [ self, [ ] ], [ entry "line": 6, [ ] ] ], [ ] ] ], [ entry "line": 1, [ ] ] ] ], [ ] ]

then Class Map at time 35 = [ entry "Person": [ entry "bases": [ ], [ entry "methods": [ entry "__init__": [ entry "params": [ self, [ first_name, [ last_name, [ age, [ ] ] ] ] ], [ entry "line": 2, [ ] ] ], [ entry "age_in_months": [ entry "params": [ self, [ ] ], [ entry "line": 6, [ ] ] ], [ ] ] ], [ entry "line": 1, [ ] ] ] ], [ ] ]

• expression state at time 35 = "begin_expr"
• the expression at time 35 = self."last_name" = last_name
• Value Stack at time 35 = [ ]

then Value Stack at time 36 = [ [ ], [ ] ]

• expression state at time 35 = "begin_expr"
• the expression at time 35 = self."last_name" = last_name
• parent stack at time 35 = [ ]

then parent stack at time 36 = [ self."last_name" = last_name, [ ] ]

• expression state at time 35 = "begin_expr"
• the expression at time 35 = self."last_name" = last_name
• arguments stack at time 35 = [ ]

then arguments stack at time 36 = [ [ last_name, [ ] ], [ ] ]

• expression state at time 35 = "begin_expr"
• the expression at time 35 = self."last_name" = last_name

then expression state at time 36 = "iterate_args"

• expression state at time 35 = "begin_expr"
• the expression at time 35 = self."last_name" = last_name

then the expression at time 36 = self."last_name" = last_name

• expression state at time 35 = "begin_expr"
• Variables Map at time 35 = [ entry self: (Python reference 0), [ entry first_name: "John", [ entry last_name: "Smith", [ entry age: 25, [ ] ] ] ] ]

then Variables Map at time 36 = [ entry self: (Python reference 0), [ entry first_name: "John", [ entry last_name: "Smith", [ entry age: 25, [ ] ] ] ] ]

• expression state at time 35 = "begin_expr"
• the line at time 35 = 4

then the line at time 36 = 4

• expression state at time 35 = "begin_expr"
• the tab at time 35 = 2

then the tab at time 36 = 2

• expression state at time 35 = "begin_expr"
• stack at time 35 = [ program context with variables: [ ] and expression state: (expression state with parent stack: [ ] arguments: [ ] values: [ ] line: 8 tab: 0) and control map: [ entry 0: (pair ("class", "Person")), [ ] ], [ ] ]

then stack at time 36 = [ program context with variables: [ ] and expression state: (expression state with parent stack: [ ] arguments: [ ] values: [ ] line: 8 tab: 0) and control map: [ entry 0: (pair ("class", "Person")), [ ] ], [ ] ]

• expression state at time 35 = "begin_expr"
• Python Object Store at time 35 = [ Python object: [ entry "__class_name__": "Person", [ entry "first_name": "John", [ ] ] ], [ ] ]

then Python Object Store at time 36 = [ Python object: [ entry "__class_name__": "Person", [ entry "first_name": "John", [ ] ] ], [ ] ]

• expression state at time 35 = "begin_expr"
• Control Map at time 35 = [ entry 0: (pair ("class", "Person")), [ entry 1: (pair ("method", "__init__")), [ ] ] ]

then Control Map at time 36 = [ entry 0: (pair ("class", "Person")), [ entry 1: (pair ("method", "__init__")), [ ] ] ]

• expression state at time 35 = "begin_expr"
• Class Map at time 35 = [ entry "Person": [ entry "bases": [ ], [ entry "methods": [ entry "__init__": [ entry "params": [ self, [ first_name, [ last_name, [ age, [ ] ] ] ] ], [ entry "line": 2, [ ] ] ], [ entry "age_in_months": [ entry "params": [ self, [ ] ], [ entry "line": 6, [ ] ] ], [ ] ] ], [ entry "line": 1, [ ] ] ] ], [ ] ]

then Class Map at time 36 = [ entry "Person": [ entry "bases": [ ], [ entry "methods": [ entry "__init__": [ entry "params": [ self, [ first_name, [ last_name, [ age, [ ] ] ] ] ], [ entry "line": 2, [ ] ] ], [ entry "age_in_months": [ entry "params": [ self, [ ] ], [ entry "line": 6, [ ] ] ], [ ] ] ], [ entry "line": 1, [ ] ] ] ], [ ] ]

• expression state at time 36 = "iterate_args"
• arguments stack at time 36 = [ [ last_name, [ ] ], [ ] ]

then the expression at time 37 = last_name

• expression state at time 36 = "iterate_args"
• arguments stack at time 36 = [ [ last_name, [ ] ], [ ] ]

then arguments stack at time 37 = [ [ ], [ ] ]

• expression state at time 36 = "iterate_args"
• arguments stack at time 36 = [ [ last_name, [ ] ], [ ] ]

then expression state at time 37 = "begin_expr"

• expression state at time 36 = "iterate_args"
• arguments stack at time 36 = [ [ last_name, [ ] ], [ ] ]
• parent stack at time 36 = [ self."last_name" = last_name, [ ] ]

then parent stack at time 37 = [ self."last_name" = last_name, [ ] ]

• expression state at time 36 = "iterate_args"
• Value Stack at time 36 = [ [ ], [ ] ]

then Value Stack at time 37 = [ [ ], [ ] ]

• expression state at time 36 = "iterate_args"
• the line at time 36 = 4

then the line at time 37 = 4

• expression state at time 36 = "iterate_args"
• the tab at time 36 = 2

then the tab at time 37 = 2

• expression state at time 36 = "iterate_args"
• stack at time 36 = [ program context with variables: [ ] and expression state: (expression state with parent stack: [ ] arguments: [ ] values: [ ] line: 8 tab: 0) and control map: [ entry 0: (pair ("class", "Person")), [ ] ], [ ] ]

then stack at time 37 = [ program context with variables: [ ] and expression state: (expression state with parent stack: [ ] arguments: [ ] values: [ ] line: 8 tab: 0) and control map: [ entry 0: (pair ("class", "Person")), [ ] ], [ ] ]

• expression state at time 36 = "iterate_args"
• Python Object Store at time 36 = [ Python object: [ entry "__class_name__": "Person", [ entry "first_name": "John", [ ] ] ], [ ] ]

then Python Object Store at time 37 = [ Python object: [ entry "__class_name__": "Person", [ entry "first_name": "John", [ ] ] ], [ ] ]

• expression state at time 36 = "iterate_args"
• Control Map at time 36 = [ entry 0: (pair ("class", "Person")), [ entry 1: (pair ("method", "__init__")), [ ] ] ]

then Control Map at time 37 = [ entry 0: (pair ("class", "Person")), [ entry 1: (pair ("method", "__init__")), [ ] ] ]

• expression state at time 36 = "iterate_args"
• Variables Map at time 36 = [ entry self: (Python reference 0), [ entry first_name: "John", [ entry last_name: "Smith", [ entry age: 25, [ ] ] ] ] ]

then Variables Map at time 37 = [ entry self: (Python reference 0), [ entry first_name: "John", [ entry last_name: "Smith", [ entry age: 25, [ ] ] ] ] ]

• expression state at time 36 = "iterate_args"
• Class Map at time 36 = [ entry "Person": [ entry "bases": [ ], [ entry "methods": [ entry "__init__": [ entry "params": [ self, [ first_name, [ last_name, [ age, [ ] ] ] ] ], [ entry "line": 2, [ ] ] ], [ entry "age_in_months": [ entry "params": [ self, [ ] ], [ entry "line": 6, [ ] ] ], [ ] ] ], [ entry "line": 1, [ ] ] ] ], [ ] ]

then Class Map at time 37 = [ entry "Person": [ entry "bases": [ ], [ entry "methods": [ entry "__init__": [ entry "params": [ self, [ first_name, [ last_name, [ age, [ ] ] ] ] ], [ entry "line": 2, [ ] ] ], [ entry "age_in_months": [ entry "params": [ self, [ ] ], [ entry "line": 6, [ ] ] ], [ ] ] ], [ entry "line": 1, [ ] ] ] ], [ ] ]

• expression state at time 37 = "begin_expr"
• Variables Map at time 37 = [ entry self: (Python reference 0), [ entry first_name: "John", [ entry last_name: "Smith", [ entry age: 25, [ ] ] ] ] ]

then Variables Map at time 38 = [ entry self: (Python reference 0), [ entry first_name: "John", [ entry last_name: "Smith", [ entry age: 25, [ ] ] ] ] ]

• the expression at time 37 = last_name
• expression state at time 37 = "begin_expr"
• last_name is a variable
• parent stack at time 37 = [ self."last_name" = last_name, [ ] ]

then expression state at time 38 = "return"

• the expression at time 37 = last_name
• expression state at time 37 = "begin_expr"
• last_name is a variable
• Value Stack at time 37 = [ [ ], [ ] ]

then Value Stack at time 38 = [ [ ], [ ] ]

• the expression at time 37 = last_name
• expression state at time 37 = "begin_expr"
• last_name is a variable
• arguments stack at time 37 = [ [ ], [ ] ]

then arguments stack at time 38 = [ [ ], [ ] ]

• expression state at time 37 = "begin_expr"
• the expression at time 37 = last_name
• last_name is a variable
• Variables Map at time 37 = [ entry self: (Python reference 0), [ entry first_name: "John", [ entry last_name: "Smith", [ entry age: 25, [ ] ] ] ] ]

then Return Value at time 38 = "Smith"

• expression state at time 37 = "begin_expr"
• the expression at time 37 = last_name
• last_name is a variable
• parent stack at time 37 = [ self."last_name" = last_name, [ ] ]

then parent stack at time 38 = [ self."last_name" = last_name, [ ] ]

• expression state at time 37 = "begin_expr"
• the line at time 37 = 4

then the line at time 38 = 4

• expression state at time 37 = "begin_expr"
• the tab at time 37 = 2

then the tab at time 38 = 2

• expression state at time 37 = "begin_expr"
• stack at time 37 = [ program context with variables: [ ] and expression state: (expression state with parent stack: [ ] arguments: [ ] values: [ ] line: 8 tab: 0) and control map: [ entry 0: (pair ("class", "Person")), [ ] ], [ ] ]

then stack at time 38 = [ program context with variables: [ ] and expression state: (expression state with parent stack: [ ] arguments: [ ] values: [ ] line: 8 tab: 0) and control map: [ entry 0: (pair ("class", "Person")), [ ] ], [ ] ]

• expression state at time 37 = "begin_expr"
• Python Object Store at time 37 = [ Python object: [ entry "__class_name__": "Person", [ entry "first_name": "John", [ ] ] ], [ ] ]

then Python Object Store at time 38 = [ Python object: [ entry "__class_name__": "Person", [ entry "first_name": "John", [ ] ] ], [ ] ]

• expression state at time 37 = "begin_expr"
• Control Map at time 37 = [ entry 0: (pair ("class", "Person")), [ entry 1: (pair ("method", "__init__")), [ ] ] ]

then Control Map at time 38 = [ entry 0: (pair ("class", "Person")), [ entry 1: (pair ("method", "__init__")), [ ] ] ]

• expression state at time 37 = "begin_expr"
• Class Map at time 37 = [ entry "Person": [ entry "bases": [ ], [ entry "methods": [ entry "__init__": [ entry "params": [ self, [ first_name, [ last_name, [ age, [ ] ] ] ] ], [ entry "line": 2, [ ] ] ], [ entry "age_in_months": [ entry "params": [ self, [ ] ], [ entry "line": 6, [ ] ] ], [ ] ] ], [ entry "line": 1, [ ] ] ] ], [ ] ]

then Class Map at time 38 = [ entry "Person": [ entry "bases": [ ], [ entry "methods": [ entry "__init__": [ entry "params": [ self, [ first_name, [ last_name, [ age, [ ] ] ] ] ], [ entry "line": 2, [ ] ] ], [ entry "age_in_months": [ entry "params": [ self, [ ] ], [ entry "line": 6, [ ] ] ], [ ] ] ], [ entry "line": 1, [ ] ] ] ], [ ] ]

• expression state at time 38 = "return"
• Value Stack at time 38 = [ [ ], [ ] ]
• Return Value at time 38 = "Smith"

then Value Stack at time 39 = [ [ "Smith", [ ] ], [ ] ]

• expression state at time 38 = "return"
• Variables Map at time 38 = [ entry self: (Python reference 0), [ entry first_name: "John", [ entry last_name: "Smith", [ entry age: 25, [ ] ] ] ] ]

then Variables Map at time 39 = [ entry self: (Python reference 0), [ entry first_name: "John", [ entry last_name: "Smith", [ entry age: 25, [ ] ] ] ] ]

• expression state at time 38 = "return"
• the line at time 38 = 4

then the line at time 39 = 4

• expression state at time 38 = "return"
• the tab at time 38 = 2

then the tab at time 39 = 2

• expression state at time 38 = "return"
• arguments stack at time 38 = [ [ ], [ ] ]

then arguments stack at time 39 = [ [ ], [ ] ]

• expression state at time 38 = "return"
• parent stack at time 38 = [ self."last_name" = last_name, [ ] ]

then parent stack at time 39 = [ self."last_name" = last_name, [ ] ]

• expression state at time 38 = "return"
• stack at time 38 = [ program context with variables: [ ] and expression state: (expression state with parent stack: [ ] arguments: [ ] values: [ ] line: 8 tab: 0) and control map: [ entry 0: (pair ("class", "Person")), [ ] ], [ ] ]

then stack at time 39 = [ program context with variables: [ ] and expression state: (expression state with parent stack: [ ] arguments: [ ] values: [ ] line: 8 tab: 0) and control map: [ entry 0: (pair ("class", "Person")), [ ] ], [ ] ]

• expression state at time 38 = "return"
• Class Map at time 38 = [ entry "Person": [ entry "bases": [ ], [ entry "methods": [ entry "__init__": [ entry "params": [ self, [ first_name, [ last_name, [ age, [ ] ] ] ] ], [ entry "line": 2, [ ] ] ], [ entry "age_in_months": [ entry "params": [ self, [ ] ], [ entry "line": 6, [ ] ] ], [ ] ] ], [ entry "line": 1, [ ] ] ] ], [ ] ]

then Class Map at time 39 = [ entry "Person": [ entry "bases": [ ], [ entry "methods": [ entry "__init__": [ entry "params": [ self, [ first_name, [ last_name, [ age, [ ] ] ] ] ], [ entry "line": 2, [ ] ] ], [ entry "age_in_months": [ entry "params": [ self, [ ] ], [ entry "line": 6, [ ] ] ], [ ] ] ], [ entry "line": 1, [ ] ] ] ], [ ] ]

• expression state at time 38 = "return"
• Python Object Store at time 38 = [ Python object: [ entry "__class_name__": "Person", [ entry "first_name": "John", [ ] ] ], [ ] ]

then Python Object Store at time 39 = [ Python object: [ entry "__class_name__": "Person", [ entry "first_name": "John", [ ] ] ], [ ] ]

• expression state at time 38 = "return"
• Control Map at time 38 = [ entry 0: (pair ("class", "Person")), [ entry 1: (pair ("method", "__init__")), [ ] ] ]

then Control Map at time 39 = [ entry 0: (pair ("class", "Person")), [ entry 1: (pair ("method", "__init__")), [ ] ] ]

• expression state at time 39 = "iterate_args"
• arguments stack at time 39 = [ [ ], [ ] ]
• parent stack at time 39 = [ self."last_name" = last_name, [ ] ]

then expression state at time 40 = "call_function_begin"

• expression state at time 39 = "iterate_args"
• arguments stack at time 39 = [ [ ], [ ] ]
• parent stack at time 39 = [ self."last_name" = last_name, [ ] ]

then the expression at time 40 = self."last_name" = last_name

• expression state at time 39 = "iterate_args"
• arguments stack at time 39 = [ [ ], [ ] ]
• parent stack at time 39 = [ self."last_name" = last_name, [ ] ]

then parent stack at time 40 = [ ]

• expression state at time 39 = "iterate_args"
• arguments stack at time 39 = [ [ ], [ ] ]
• parent stack at time 39 = [ self."last_name" = last_name, [ ] ]

then arguments stack at time 40 = [ ]

• expression state at time 39 = "iterate_args"
• Value Stack at time 39 = [ [ "Smith", [ ] ], [ ] ]

then Value Stack at time 40 = [ [ "Smith", [ ] ], [ ] ]

• expression state at time 39 = "iterate_args"
• the line at time 39 = 4

then the line at time 40 = 4

• expression state at time 39 = "iterate_args"
• the tab at time 39 = 2

then the tab at time 40 = 2

• expression state at time 39 = "iterate_args"
• stack at time 39 = [ program context with variables: [ ] and expression state: (expression state with parent stack: [ ] arguments: [ ] values: [ ] line: 8 tab: 0) and control map: [ entry 0: (pair ("class", "Person")), [ ] ], [ ] ]

then stack at time 40 = [ program context with variables: [ ] and expression state: (expression state with parent stack: [ ] arguments: [ ] values: [ ] line: 8 tab: 0) and control map: [ entry 0: (pair ("class", "Person")), [ ] ], [ ] ]

• expression state at time 39 = "iterate_args"
• Python Object Store at time 39 = [ Python object: [ entry "__class_name__": "Person", [ entry "first_name": "John", [ ] ] ], [ ] ]

then Python Object Store at time 40 = [ Python object: [ entry "__class_name__": "Person", [ entry "first_name": "John", [ ] ] ], [ ] ]

• expression state at time 39 = "iterate_args"
• Control Map at time 39 = [ entry 0: (pair ("class", "Person")), [ entry 1: (pair ("method", "__init__")), [ ] ] ]

then Control Map at time 40 = [ entry 0: (pair ("class", "Person")), [ entry 1: (pair ("method", "__init__")), [ ] ] ]

• expression state at time 39 = "iterate_args"
• Variables Map at time 39 = [ entry self: (Python reference 0), [ entry first_name: "John", [ entry last_name: "Smith", [ entry age: 25, [ ] ] ] ] ]

then Variables Map at time 40 = [ entry self: (Python reference 0), [ entry first_name: "John", [ entry last_name: "Smith", [ entry age: 25, [ ] ] ] ] ]

• expression state at time 39 = "iterate_args"
• Class Map at time 39 = [ entry "Person": [ entry "bases": [ ], [ entry "methods": [ entry "__init__": [ entry "params": [ self, [ first_name, [ last_name, [ age, [ ] ] ] ] ], [ entry "line": 2, [ ] ] ], [ entry "age_in_months": [ entry "params": [ self, [ ] ], [ entry "line": 6, [ ] ] ], [ ] ] ], [ entry "line": 1, [ ] ] ] ], [ ] ]

then Class Map at time 40 = [ entry "Person": [ entry "bases": [ ], [ entry "methods": [ entry "__init__": [ entry "params": [ self, [ first_name, [ last_name, [ age, [ ] ] ] ] ], [ entry "line": 2, [ ] ] ], [ entry "age_in_months": [ entry "params": [ self, [ ] ], [ entry "line": 6, [ ] ] ], [ ] ] ], [ entry "line": 1, [ ] ] ] ], [ ] ]

• expression state at time 40 = "call_function_begin"
• Value Stack at time 40 = [ [ "Smith", [ ] ], [ ] ]
• the expression at time 40 = self."last_name" = last_name
• value at self in map (Variables Map at time 40) = Python reference 0
• Python Object Store at time 40 = [ Python object: [ entry "__class_name__": "Person", [ entry "first_name": "John", [ ] ] ], [ ] ]
• the element at index 0 of stack (Python Object Store at time 40) = Python object: [ entry "__class_name__": "Person", [ entry "first_name": "John", [ ] ] ]

then Python Object Store at time 41 = [ Python object: [ entry "__class_name__": "Person", [ entry "first_name": "John", [ entry "last_name": "Smith", [ ] ] ] ], [ ] ]

• expression state at time 40 = "call_function_begin"
• parent stack at time 40 = [ ]
• the expression at time 40 = self."last_name" = last_name

then expression state at time 41 = "end_expr"

• expression state at time 40 = "call_function_begin"
• Value Stack at time 40 = [ [ "Smith", [ ] ], [ ] ]
• the expression at time 40 = self."last_name" = last_name

then Value Stack at time 41 = [ ]

• expression state at time 40 = "call_function_begin"
• arguments stack at time 40 = [ ]

then arguments stack at time 41 = [ ]

• expression state at time 40 = "call_function_begin"
• parent stack at time 40 = [ ]

then parent stack at time 41 = [ ]

• expression state at time 40 = "call_function_begin"
• Control Map at time 40 = [ entry 0: (pair ("class", "Person")), [ entry 1: (pair ("method", "__init__")), [ ] ] ]

then Control Map at time 41 = [ entry 0: (pair ("class", "Person")), [ entry 1: (pair ("method", "__init__")), [ ] ] ]

• expression state at time 40 = "call_function_begin"
• Variables Map at time 40 = [ entry self: (Python reference 0), [ entry first_name: "John", [ entry last_name: "Smith", [ entry age: 25, [ ] ] ] ] ]

then Variables Map at time 41 = [ entry self: (Python reference 0), [ entry first_name: "John", [ entry last_name: "Smith", [ entry age: 25, [ ] ] ] ] ]

• expression state at time 40 = "call_function_begin"
• the line at time 40 = 4

then the line at time 41 = 4

• expression state at time 40 = "call_function_begin"
• the tab at time 40 = 2

then the tab at time 41 = 2

• expression state at time 40 = "call_function_begin"
• stack at time 40 = [ program context with variables: [ ] and expression state: (expression state with parent stack: [ ] arguments: [ ] values: [ ] line: 8 tab: 0) and control map: [ entry 0: (pair ("class", "Person")), [ ] ], [ ] ]

then stack at time 41 = [ program context with variables: [ ] and expression state: (expression state with parent stack: [ ] arguments: [ ] values: [ ] line: 8 tab: 0) and control map: [ entry 0: (pair ("class", "Person")), [ ] ], [ ] ]

• expression state at time 40 = "call_function_begin"
• Class Map at time 40 = [ entry "Person": [ entry "bases": [ ], [ entry "methods": [ entry "__init__": [ entry "params": [ self, [ first_name, [ last_name, [ age, [ ] ] ] ] ], [ entry "line": 2, [ ] ] ], [ entry "age_in_months": [ entry "params": [ self, [ ] ], [ entry "line": 6, [ ] ] ], [ ] ] ], [ entry "line": 1, [ ] ] ] ], [ ] ]

then Class Map at time 41 = [ entry "Person": [ entry "bases": [ ], [ entry "methods": [ entry "__init__": [ entry "params": [ self, [ first_name, [ last_name, [ age, [ ] ] ] ] ], [ entry "line": 2, [ ] ] ], [ entry "age_in_months": [ entry "params": [ self, [ ] ], [ entry "line": 6, [ ] ] ], [ ] ] ], [ entry "line": 1, [ ] ] ] ], [ ] ]

• the line at time 41 = 4
• the tab at time 41 = 2
• statement at line 4, tab 2 = self."last_name" = last_name
• expression state at time 41 = "end_expr"

then the line at time 42 = 5

• the line at time 41 = 4
• the tab at time 41 = 2
• statement at line 4, tab 2 = self."last_name" = last_name
• expression state at time 41 = "end_expr"

then the tab at time 42 = 2

• the line at time 41 = 4
• the tab at time 41 = 2
• statement at line 4, tab 2 = self."last_name" = last_name
• expression state at time 41 = "end_expr"
• Python Object Store at time 41 = [ Python object: [ entry "__class_name__": "Person", [ entry "first_name": "John", [ entry "last_name": "Smith", [ ] ] ] ], [ ] ]

then Python Object Store at time 42 = [ Python object: [ entry "__class_name__": "Person", [ entry "first_name": "John", [ entry "last_name": "Smith", [ ] ] ] ], [ ] ]

• the line at time 41 = 4
• the tab at time 41 = 2
• statement at line 4, tab 2 = self."last_name" = last_name
• expression state at time 41 = "end_expr"
• Control Map at time 41 = [ entry 0: (pair ("class", "Person")), [ entry 1: (pair ("method", "__init__")), [ ] ] ]

then Control Map at time 42 = [ entry 0: (pair ("class", "Person")), [ entry 1: (pair ("method", "__init__")), [ ] ] ]

• the line at time 41 = 4
• the tab at time 41 = 2
• statement at line 4, tab 2 = self."last_name" = last_name
• Variables Map at time 41 = [ entry self: (Python reference 0), [ entry first_name: "John", [ entry last_name: "Smith", [ entry age: 25, [ ] ] ] ] ]

then Variables Map at time 42 = [ entry self: (Python reference 0), [ entry first_name: "John", [ entry last_name: "Smith", [ entry age: 25, [ ] ] ] ] ]

• the line at time 41 = 4
• the tab at time 41 = 2
• statement at line 4, tab 2 = self."last_name" = last_name
• stack at time 41 = [ program context with variables: [ ] and expression state: (expression state with parent stack: [ ] arguments: [ ] values: [ ] line: 8 tab: 0) and control map: [ entry 0: (pair ("class", "Person")), [ ] ], [ ] ]

then stack at time 42 = [ program context with variables: [ ] and expression state: (expression state with parent stack: [ ] arguments: [ ] values: [ ] line: 8 tab: 0) and control map: [ entry 0: (pair ("class", "Person")), [ ] ], [ ] ]

• the line at time 41 = 4
• the tab at time 41 = 2
• statement at line 4, tab 2 = self."last_name" = last_name
• Class Map at time 41 = [ entry "Person": [ entry "bases": [ ], [ entry "methods": [ entry "__init__": [ entry "params": [ self, [ first_name, [ last_name, [ age, [ ] ] ] ] ], [ entry "line": 2, [ ] ] ], [ entry "age_in_months": [ entry "params": [ self, [ ] ], [ entry "line": 6, [ ] ] ], [ ] ] ], [ entry "line": 1, [ ] ] ] ], [ ] ]

then Class Map at time 42 = [ entry "Person": [ entry "bases": [ ], [ entry "methods": [ entry "__init__": [ entry "params": [ self, [ first_name, [ last_name, [ age, [ ] ] ] ] ], [ entry "line": 2, [ ] ] ], [ entry "age_in_months": [ entry "params": [ self, [ ] ], [ entry "line": 6, [ ] ] ], [ ] ] ], [ entry "line": 1, [ ] ] ] ], [ ] ]

• the line at time 42 = 5
• the tab at time 42 = 2
• statement at line 5, tab 2 = self."age" = age
• expression state at time 42 = "not_expr"

then the expression at time 43 = self."age" = age

• the line at time 42 = 5
• the tab at time 42 = 2
• statement at line 5, tab 2 = self."age" = age
• expression state at time 42 = "not_expr"

then expression state at time 43 = "begin_expr"

• the line at time 42 = 5
• the tab at time 42 = 2
• statement at line 5, tab 2 = self."age" = age
• expression state at time 42 = "not_expr"

then the line at time 43 = 5

• the line at time 42 = 5
• the tab at time 42 = 2
• statement at line 5, tab 2 = self."age" = age
• expression state at time 42 = "not_expr"

then the tab at time 43 = 2

• the line at time 42 = 5
• the tab at time 42 = 2
• statement at line 5, tab 2 = self."age" = age
• expression state at time 42 = "not_expr"

then Value Stack at time 43 = [ ]

• the line at time 42 = 5
• the tab at time 42 = 2
• statement at line 5, tab 2 = self."age" = age
• expression state at time 42 = "not_expr"

then parent stack at time 43 = [ ]

• the line at time 42 = 5
• the tab at time 42 = 2
• statement at line 5, tab 2 = self."age" = age
• expression state at time 42 = "not_expr"

then arguments stack at time 43 = [ ]

• the line at time 42 = 5
• the tab at time 42 = 2
• statement at line 5, tab 2 = self."age" = age
• expression state at time 42 = "not_expr"
• Python Object Store at time 42 = [ Python object: [ entry "__class_name__": "Person", [ entry "first_name": "John", [ entry "last_name": "Smith", [ ] ] ] ], [ ] ]

then Python Object Store at time 43 = [ Python object: [ entry "__class_name__": "Person", [ entry "first_name": "John", [ entry "last_name": "Smith", [ ] ] ] ], [ ] ]

• the line at time 42 = 5
• the tab at time 42 = 2
• statement at line 5, tab 2 = self."age" = age
• expression state at time 42 = "not_expr"
• Control Map at time 42 = [ entry 0: (pair ("class", "Person")), [ entry 1: (pair ("method", "__init__")), [ ] ] ]

then Control Map at time 43 = [ entry 0: (pair ("class", "Person")), [ entry 1: (pair ("method", "__init__")), [ ] ] ]

• the line at time 42 = 5
• the tab at time 42 = 2
• statement at line 5, tab 2 = self."age" = age
• Variables Map at time 42 = [ entry self: (Python reference 0), [ entry first_name: "John", [ entry last_name: "Smith", [ entry age: 25, [ ] ] ] ] ]

then Variables Map at time 43 = [ entry self: (Python reference 0), [ entry first_name: "John", [ entry last_name: "Smith", [ entry age: 25, [ ] ] ] ] ]

• the line at time 42 = 5
• the tab at time 42 = 2
• statement at line 5, tab 2 = self."age" = age
• stack at time 42 = [ program context with variables: [ ] and expression state: (expression state with parent stack: [ ] arguments: [ ] values: [ ] line: 8 tab: 0) and control map: [ entry 0: (pair ("class", "Person")), [ ] ], [ ] ]

then stack at time 43 = [ program context with variables: [ ] and expression state: (expression state with parent stack: [ ] arguments: [ ] values: [ ] line: 8 tab: 0) and control map: [ entry 0: (pair ("class", "Person")), [ ] ], [ ] ]

• the line at time 42 = 5
• the tab at time 42 = 2
• statement at line 5, tab 2 = self."age" = age
• Class Map at time 42 = [ entry "Person": [ entry "bases": [ ], [ entry "methods": [ entry "__init__": [ entry "params": [ self, [ first_name, [ last_name, [ age, [ ] ] ] ] ], [ entry "line": 2, [ ] ] ], [ entry "age_in_months": [ entry "params": [ self, [ ] ], [ entry "line": 6, [ ] ] ], [ ] ] ], [ entry "line": 1, [ ] ] ] ], [ ] ]

then Class Map at time 43 = [ entry "Person": [ entry "bases": [ ], [ entry "methods": [ entry "__init__": [ entry "params": [ self, [ first_name, [ last_name, [ age, [ ] ] ] ] ], [ entry "line": 2, [ ] ] ], [ entry "age_in_months": [ entry "params": [ self, [ ] ], [ entry "line": 6, [ ] ] ], [ ] ] ], [ entry "line": 1, [ ] ] ] ], [ ] ]

• expression state at time 43 = "begin_expr"
• the expression at time 43 = self."age" = age
• Value Stack at time 43 = [ ]

then Value Stack at time 44 = [ [ ], [ ] ]