Python Variables

Jakob Jenkov
Last update: 2022-03-02

Python variables are little "containers" in which you can store values (data) which can be varied over time. A Python variable thus has a name and a value. When referring to a variable you refer to it by its name. When referring to a variable you are essentially referring to the value the variable contains.

Declaring a Variable in Python

Declaring a variable in Python is done simply by writing the variable name and assigning a value to the variable. Here is how declaring a variable in Python looks:

my_var = 123

The name of this variable is my_var. The value assigned to it is the numeric value 123. The equals sign tells Python to assign the value to the right of it - to the variable named to the left of it.

Assigning Values to a Variable in Python

You assign a value to a variable in Python in the same way as shown in the paragraph about about declaring a variable. You write the name of the variable, followed by an equals sign, followed by the value you want to assign to the variable. Here is how assigning values to a variable in Python looks:

my_var = 456
my_var = "Hello World"
my_var = 45.89

Reading the Value of a Variable in Python

You read the value of a variable by referencing its name. When reading the value you typically have to read it into something. Typically, that is another variable, or a parameter value for a function. Here is how reading the value of a variable in Python looks:

my_var = 789
my_other_var = my_var

print(my_other_var)

Jakob Jenkov

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