Variables are named references to locations in memory for temporarily storing data while a program is running.
Variables are named references to locations in memory for temporarily storing data while a program is running.
Each variable or constant should have a meaningful and unique identifier (name).
Identifiers can't be reserved keywords (like if, and or while) or start with numbers.
A constant is a special type of variable whose value does not change as the program runs.
Constant identifiers are usually written in CAPITALS.
Declaring a variable means setting its value for the first time.
In pseudo-code, we use code like num ← 123 to declare or change the value of a variable.
In Python, we use code like num = 123 to declare or change the value of a variable.
Which is a better identifier: number or n?
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number is more meaningful than n, and so would be preferred.