What are variables in Python?

Python has no command for declaring a variable.
A variable is made the instant you initially assign a worth thereto.
The variables don’t get to be asked with any particular type, and may even change type after they need been set.
We will assign variety to a variable.
A variable name cannot be varied. But you’ll include numbers during a variable name—-as long as you do not begin the name with variety.
String variables are often declared either by using single or quotation marks.

A variable can have a brief name(like x and y) or a more descriptive name (department, School name,total_cost).

Always remember that the variable name must start with a letter or the underscore character.
The variable name cannot start with variety.
Note that a variable name can only contain alpha-numeric characters and underscores (A-Z, 0-9, and _)
Also note that the variable names are case-sensitive (age, Age, and AGE are three different variables)
We will use the +character to feature a variable to a different variable.
Variables that are created outside of a function (as altogether of the examples above) are referred to as global variables.
Global variables are often employed by everyone, both inside functions and out of doors.

We’ll want to watch out for a common mistake: forgetting to initialize variables. If we try to use a variable without first initializing it, we’ll run into a NameError.
This is the Python interpreter catching the mistake and telling us that we’re using an undefined variable.
The fix is pretty simple: initialize the variable by assigning the variable a value before we use it.
Another common mistake to watch out for that can be a little trickier to spot is forgetting to initialize variables with the correct value.
If we use a variable earlier in our code and then reuse it later in a loop without setting the value to something we want, our code may wind up doing something we didn’t expect.
Don’t forget to initialize our variables before using them.