Variables in Python

Variables

I have a value where do i store it in my computer?

Well that's where variables come handy.

Variables refer to

1. A location in the memory that are reserved to store the values of my code

2. A container that holds one value and has a label on it.

From our definition we can visualise a variable as a gift box with similar characteristics like a container-like, has a label, stores something etc.

Syntax for declaring a variable in python is:

'variable_name' 'assignment operator' 'value'

name = 'john'

age = 20

option = True

Variables in python have a specific naming convention.

1. Use snake_case or CamelCase naming convention.

e.g my_name, MyName.

2. Variable name can only contain alphanumeric character and underscores [A - Z, 0 - 9 and _].

3. Variable name starts with a letter or the underscore character.

e.g _name = 'john' or name = 'john'

4. Variable name should not be a keyword.

e.g in, for, while etc.

5. Variable names should meaningful.

e.g my_name will definitely mean that the variable stores a name as a value.

If a variable is not defined (assigned a value) , trying to use it will give us specifically a NameError.

Multiple assignment in a single line

Supposed we want to define numerous variables using single line of code, we can do it by separating variable names and values with commas.

a, b, c = 1, "alphabet", True

The line above is similar to

a = 1

b = "alphabet"

c = True

Variables are key components for any programming language.