What Is a Variable in Python?

A variable in Python is a name that refers to a value.

You use variables to store data and use it later in your code. For example, you can store a person's name, an age, a price, or a True/False value in a variable.

In Python, you create a variable by assigning a value with =.

name = "Sam"
age = 12

print(name)
print(age)

Output:

Sam
12

In this example:

name is a variable that refers to the text "Sam"
age is a variable that refers to the number 12

This is the basic idea of a variable: a named place for storing data.

What a variable means

A variable is a name that refers to a value.

That means:

It lets you store data and use it later
The value can be text, a number, True/False, or other kinds of data
In Python, you create a variable by assigning a value with =

Example:

message = "Hello"
print(message)

Output:

Hello

Here, message is the variable name, and "Hello" is the value.

If you are new to Python, you may also want to read Python variables explained for beginners.

Why variables are useful

Variables are used in almost every Python program because they make code easier to work with.

They help because:

They make code easier to read
They let you reuse values without typing them again
They make it easier to update data in one place

Example without a variable:

print("Sam")
print("Sam")

Example with a variable:

name = "Sam"
print(name)
print(name)

The second version is easier to update. If the name changes, you only need to change it once.

How to create a variable

To create a variable in Python:

Write the variable name on the left
Write = in the middle
Write the value on the right

Example:

score = 100
print(score)

Output:

It helps to remember that = here means assignment, not mathematical equality. It means “put this value into this variable name.”

Simple variable examples

Variables can store different kinds of values.

Store text

city = "London"
print(city)

Store a whole number

count = 5
print(count)

Store a decimal number

price = 9.99
print(price)

Store a boolean

is_ready = True
print(is_ready)

These are different data types in Python. If you want a broader view, see Python data types overview.

Changing a variable value

A variable can point to a new value later.

This is called reassignment.

count = 5
print(count)

count = 6
print(count)

Output:

5
6

The newest assigned value is the current one.

This is another reason variables are useful. You can update information as your program runs.

Basic naming rules

Python variable names must follow some simple rules:

Names can contain letters, numbers, and underscores
Names cannot start with a number
Names cannot contain spaces
You cannot use Python keywords like if, for, or class

Valid names:

user_name = "Ana"
score1 = 10
total_price = 19.99

Invalid names:

# 2name = "Ana"
# user name = "Ana"
# class = "Math"

Those examples are invalid because:

2name starts with a number
user name contains a space
class is a Python keyword

Good variable names

Choose names that describe the value clearly.

Good variable names make code easier to read and debug.

Prefer names like:

total_price
user_name
is_logged_in

Instead of unclear names like:

tp
x
a1

A common Python style is to use lowercase_with_underscores for variable names.

Clear names are especially helpful for beginners.

Variables are not the same as values

A variable name and a value are not the same thing.

The variable name is the label
The value is the actual data

Example:

name = "Ana"
print(name)
print("name")

Output:

Ana
name

Why is the output different?

print(name) uses the variable called name
print("name") prints the text "name" exactly as written

So in:

name = "Ana"

name is the variable
"Ana" is the string value

This difference matters when printing, comparing, and updating data.

Common mistakes

Beginners often run into the same problems when learning variables.

Thinking `=` means “equals” in the math sense

In Python, = usually means assignment.

x = 5

This means “assign the value 5 to x.”

It does not mean “x equals 5” in the same way as a math equation.

Using quotes around a variable name by mistake

name = "Sam"

print(name)
print("name")

Output:

Sam
name

With quotes, Python treats it as text, not as a variable.

Using an invalid variable name

These names are not valid:

2name
user name

Use names like:

name2
user_name

Trying to use a variable before assigning it

print(age)
age = 12

This causes an error because age does not have a value yet.

Python often shows this as a NameError: name is not defined.

Confusing variables with data types

A variable is the name you use.

A data type is the kind of value stored there, such as a string, integer, or boolean.

You can inspect a value's type with the type() function.

Useful debugging checks:

name = "Sam"
age = 12

print(name)
print(type(name))
print(age)
print(type(age))

Possible output:

Sam
<class 'str'>
12
<class 'int'>

FAQ

Do I need to declare a variable type in Python first?

No. Python creates the variable when you assign a value to it.

Can a variable change from one type to another?

Yes. A variable can refer to a string first and a number later, though clear code usually avoids unnecessary changes.

Is a variable the same as a value?

No. The variable is the name. The value is the data stored under that name.

Why does Python say a name is not defined?

Usually because the variable was used before it was assigned, or the name was misspelled.