Variables are named locations in memory that are used to hold a value that may be modified by the program.
A variable may take different values at different time during execution.
A variable name must be a valid identifier, means can be a group of both letters and digits, but they have to begin with a letter or an underscore.
Variable name should not be a keyword.
To understand variable, you can assume that variable is like a container that holds data.
Declaring Variable and Assigning Values
In Python, You don't need to specify the type of variable because Python is a type infer language.
You don't need to declare explicitly variable in Python. When you assign any value to the variable that variable is declared automatically.
variable_name = value
name = "prowessapps" age = 20 salary = 20000 tax_rate = 4.5
As you assign value to the variable, that variable becomes of that type.
To check the type of any variable you can use inbuilt function type ( ).
type ( ) Function :
>>> name = "prowessapps" >>> type(name) <class 'str'> type of 'name' is 'string' >>> age = 20 >>> type(age) <class 'int'> type of 'age' is 'int' >>> rate = 4.5 >>> type(tax_rate) <class 'float'> type of 'rate' is 'float' >>>
Python is dynamically typed language.
Meaning of dynamically typed :
Dynamically type means you can use same variable for different value in the same program.
As per your passed value to the variable, it will become of that type.
>>> a = 20 >>> type(a) <class 'int'> here 'a' is 'int' >>> a = 2.3 >>> type(a) <class 'float'> now 'a' is 'float' >>> a = "Hello" >>> type(a) <class 'str'> now 'a' is 'string'
Multiple AssignmentAssigning single value to multiple variables :
#script.py x=y=z=50 print(x) print(y) print(z)OUTPUT :
50 50 50
Assigning multiple values to multiple variables:
#script.py x, y, z = 50, 2.3, "Hello" print(x) print(y) print(z)OUTPUT :
50 2.3 Hello
Next chapter is python data types
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