Unit 2.2:Variables

Question 1

What is a variable?

Answer 1

• Variables are containers in memory that store data.
• Each variable has a unique name (identifier) that refers to its stored value.

Question 2

What is declaration and initiation?

Answer 2

• Variables must be declared (created) and often initialized (given an initial value) before they can be used.
• The assignment operator (=) is used to assign a value to a variable.
• Attempting to use an undeclared or uninitialized variable will result in an error.

Question 3

What is a constant?

Answer 3

• Constants are variables whose values are intended to remain unchanged throughout the program.
• While Python doesn’t enforce constants, the convention is to write their names in ALL CAPS to signal their intended immutability.