Immutable vs. Mutable Objects and Scope of Variables

A set of flashcards covering key concepts related to immutable vs. mutable objects and the scope of variables in Python.

Immutable Objects

Objects that cannot be changed after being created; they can only be overwritten with new values in new memory locations.

Mutable Objects

Objects that can be changed after being created.

Types of Immutable Objects in Python

bool, int, float, str, and tuples.

Types of Mutable Objects in Python

list, dict, and set.

Pass by Value

A simulation of passing by value occurs with immutable objects, where changes inside a function do not reflect in the original variable.

Pass by Reference

All variables are passed by reference, meaning the reference to their memory location is passed to the function.

Local Variables

Variables that are only accessible within the function where they are defined and exist until the function finishes executing.

Global Variables

Variables declared outside of any function, which are accessible from anywhere in the program.

Variable Lifetime

The duration that a variable occupies memory, allocated at declaration time and existing until the program terminates for global variables or until function completion for local variables.

Scope of a Variable

The section of code where a variable is accessible, including local and global scopes.