Variables
Variables are containers for storing data values.
Creating Variables
Python has no command for declaring a variable.
A variable is created the moment you first assign a value to it.
Example
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.
Example
x = 4 # x is of type int
x = "Sally" # x is now of type str
print(x)
Casting
If you want to specify the data type of a variable, this can be done with casting.
Example
x =
str(3) # x will be '3'
y = int(3) # y
will be 3
z = float(3) # z will be 3.0
Get the Type
You can get the data type of a variable with the type() function.
Example
x = 5
y = "John"
print(type(x))
print(type(y))
Note: You will learn more about data types and casting later in this tutorial.
Single or Double Quotes?
String variables can be declared either by using single or double quotes:
Example
x = "John"
# is the same as
x =
'John'
Case-Sensitive
Variable names are case-sensitive.
Example
a = 4
A =
"Sally"
#A will not overwrite a
