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CSC148 Exam Study Questions with Complete solutions (A Graded

CSC148 Exam with Complete solutions (A Graded)

CSC148 Exam Study Questions 2024 with Complete solutions (A Graded)

CSC148 Exam Study Questions 2024 with Complete solutions (A Graded)

the only mutable types - ANSWER list and dictionaries and user defined classes Where is all data stored in? - ANSWER objects that have 3 components -> id, type and value What is special about id - ANSWER The id of an object is a unique identifier, meaning that no other object has the same identifier. difference between object and variable? - ANSWER a variable stores an object with value, id and type Variables are not objects because it doesn't store data but only storing the id. it REF...

Immutable Types - ANSWER Strings, integers, boolean, tuples value stored in an object cant change Mutable Types - ANSWER Lists, dictionaries, user defined classes ID are changable Aliasing - ANSWER A circumstance where two or more variables refer to the same object. If you change one, the other will be changed

objects are composed of... - ANSWER id (unique identifier) type (determines what functions it can use) value (what it "points to") variables - ANSWER -have an id → point to an object that stores data - variables are NOT objects immutable objects - ANSWER -immutable objects value cannot be changed however you can change what object the variable points to mutable objects - ANSWER -id does not change when value is changed -two objects may have same value but diff id -aliased variables ...

call stack - ANSWER The call stack is all of the call frames of the currently executing function calls frame - ANSWER data about a function call (including local variables) memory model: on the left - ANSWER call stack, who's frames show the program's variables and which ids they store memory model: on the right - ANSWER the object space, where all objects are shown data - ANSWER stored in id, type, and value

Expression Tree - ANSWER A structured way of modeling ("simple") Python code Expression - ANSWER A unit of code that, when evaluated, produces a single value Statement - ANSWER - evaluating a statement can produce a value, and/or has some other effect Variable environment - ANSWER A map from variable names to values {"x":1, "y": True} - Name("x").evaluate({"x": 10}) ** create a environment like this