Python Variable

Variable:

Variable is an identifier whose value can be changed. or which store the data
Example:
x=10;
x=20;

Varaible declaration rules:

1.Variable name must be starts with alphabet or underscore .
Example:
age=10;
_age=20;

2.The max length of the variable name is upto infinity characters.
3.If variable name contains morethan one word ,the second word onwords first letter should be
uppercase letter.
Example:
studentAge=10;
studentAgeDetails=10;
4.No spaces are allowed at the middle of the variable declaration.
Example:
student Age=10; (Invalid);
5.If variable value contains constant value that variable name must be
uppercase letter.
Example:
PI=3.14;
6.If constant variable name contains morethan one word ,it should be separated with underscore.
Example:
PI_VALUE=3.14;
7.All keywords are lower case letters. except True False None
Example:
if
for
while
8.We should not take keyword as a variable name.
Example:
if=10;(Invalid) Here if is a keyword
If=10;(Valid)

Variable Defination types:

1.Initilization
2.Declaration
3.Assignment

Initilization:

It Means initilize the some value to the variable.
Example:
x=10;
Here 10 is initilize to the x.

Declaration:

In the declaration no value initilize to the variable.
Example:
x=10;

Assignment:

In the assignment assign the value to the variable or assign variable to the variable.
Example:
x=10;(It is a value to variable).

y=x;(It is a variable to variable).