Aliasing

Question 1

What is the global scope?

Answer 1

When a variable is defined outside any function, it’s scope is anywhere within the program. Variables and functions defined outside of a function are accessible inside of a functions

Question 2

What is the local scope?

Answer 2

When u define a variable within a function, the scope lies only within the function. It’s value can’t be changed or accessed from outside the function. Python looks at local scope before global (refer to lec 9.1)

Question 3

What is aliasing?

Answer 3

If an object being references is mutable (lists, sets, dictionaries), then a change made in the function is also reflected in the referenced

Question 4

How can we avoid aliasing?

Answer 4

1) use list function

2) completely slice the list [ : ]

Question 5

What are aliases?

Answer 5

When two variable names refer to the same object, they are aliases. When we modify one variable, we are modifying the object it refers to (also modifying second variable)