Python Variables
Creating Variables
Unlike other programming languages, Python has no command for declaring a variable.
A variable is created the moment you first assign a value to it.
Variables do not need to be declared with any particular type and can even change type after they have been set.
Variable Names
A variable can have a short name (like x and y) or a more descriptive name (age, carname, total_volume). Rules for 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)
Remember that variables are case-sensitive
Output Variables
The Python print statement is often used to output variables.
To combine both text and a variable, Python uses the
+ character:
You can also use the + character to add a variable to another variable:
For numbers, the + character works as a mathematical operator:
If you try to combine a string and a number, Python will give you an error:
