Python Variables

Variables

Variables are containers for storing data values.

Python has no command for declaring a variable.

A variable is created the moment you first assign a value to it.

x = 5
y = "John"
print(x)
print(y)

Variables do not need to be declared with any particular type, and can even change type after they have been set.

x = 4 # x is of type int
x = "Sally" # x is now of type str
print(x)

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

x = str(3) # x will be '3'
y = int(3) # y will be 3
z = float(3) # z will be 3.0

You can get the data type of a variable with the type() function.

x = 5
y = "John"
print(type(x))
print(type(y))

You will learn more about data types and casting later in this tutorial.

String variables can be declared either by using single or double quotes:

x = "John"
# is the same as
x = 'John'

Variable names are case-sensitive.

This will create two variables:

a = 4
A = "Sally"
#A will not overwrite a