Variables are containers used for storing information.

Creating Variables

Remember that Python variable names are case-sensitive!.

Rules for creating Python variables:

• A variable name must start with a letter or the underscore character
• A variable name cannot start with a number
• A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _ )
• Variable names are case-sensitive (age, Age and AGE are three different variables)

Note: Unlike other programming languages, Python do not need to be declared with any particular type, and can even change type after they have been set. A variable is created the moment when you assign a value to it ie Creating and Declaring are done at a same time.

still if you want to declare then this can be done with casting.

Casting

If you want to specify the data type of a variable, this can be done with casting.

Example

a = str(5)     # a will be '5'
b = int(5)     # b will be 5
c = float(5)  # c will be 5.0